CN210379083U

CN210379083U - Photovoltaic module

Info

Publication number: CN210379083U
Application number: CN201921554421.3U
Authority: CN
Inventors: 潘秀娟; 毛剑宇; 董经兵; 许涛; 邢国强
Original assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: Canadian Solar Inc; CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-04-21
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a photovoltaic module. The photovoltaic module comprises at least two battery strings connected in parallel, wherein each battery string comprises a plurality of battery pieces connected in series; the battery string comprises a first sub string and a second sub string which are connected in series, and the connection point of the first sub string and the second sub string is a string connection point; the first jumper is connected with all the string connecting points; each first sub-string is reversely connected with a first diode in parallel through a first jumper and the first auxiliary lead; each second sub-string is reversely connected with a second diode in parallel through a first jumper and a second auxiliary lead; wherein, the battery piece is the one-third battery piece that is formed by whole battery piece cutting. The embodiment of the utility model provides a technical scheme, the problem that the diode that easily leads to when having avoided increasing among the photovoltaic module battery piece quantity is punctureed by the reverse appears.

Description

Photovoltaic module

Technical Field

The embodiment of the utility model provides a relate to the photovoltaic power generation field, especially relate to a photovoltaic module.

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.

SUMMERY OF THE UTILITY MODEL

The utility model provides a photovoltaic module to under the prerequisite of guaranteeing that the diode can not be punctured by reverse, increase photovoltaic module in the battery piece quantity, and then promote photovoltaic module's performance.

In a first aspect, an embodiment of the present invention provides a photovoltaic module, including at least two parallel-connected battery strings, where each battery string includes a plurality of battery pieces connected in series; the battery string comprises a first sub string and a second sub string which are connected in series, and the connection point of the first sub string and the second sub string is a string connection point;

the first jumper wire is connected with all the string connecting points;

each first sub-string is reversely connected with a first diode in parallel through the first jumper and the first auxiliary lead;

the second auxiliary lead is connected with a second diode in parallel in a reverse direction through the first jumper and the second auxiliary lead;

the battery piece is a one-third battery piece formed by cutting a whole battery piece.

In a second aspect, the present invention further provides a photovoltaic module, including at least two parallel-connected battery strings, where each battery string includes a plurality of battery pieces 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 electrically 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;

a first jumper electrically connecting the second sub-electrodes in the divided battery pieces;

each first sub-group is reversely connected with a first diode in parallel through the first jumper wire and a first auxiliary lead;

the second auxiliary lines are connected in parallel with the second diodes in an inverse mode through the first jumper and the second auxiliary lead;

the battery pieces except the divided battery pieces are one third battery pieces formed by cutting the whole battery piece.

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, the main circuit comprising at least two strings of cells connected in parallel, the strings of cells comprising a plurality of cells connected in series; the battery string comprises a first sub string and a second sub string which are connected in series, and the connection point of the first sub string and the second sub string is a string connection point;

forming a first jumper, a first auxiliary lead and a second auxiliary lead, wherein the first jumper is connected with all the string connecting points, and the first auxiliary lead and the second auxiliary lead are both connected with the first jumper;

and connecting a first diode and a second diode in order to enable each first sub-string to be reversely connected with the first diode in parallel through the first jumper wire and the first auxiliary lead, and each second sub-string to be reversely connected with the second diode in parallel through the first jumper wire and the second auxiliary lead.

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, the main circuit comprising at least two strings of cells connected in parallel, the strings of cells comprising a plurality of cells 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 electrically 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 first jumper wire, a first auxiliary lead and a second auxiliary lead, wherein the first jumper wire is connected with the second sub-electrode of each divided battery piece, and the first auxiliary lead and the second auxiliary lead are both connected with the first jumper wire;

and connecting a first diode and a second diode, so that each first subgroup is reversely connected with the first diode in parallel through the first jumper wire and the first auxiliary lead, and each second subgroup is reversely connected with the second diode in parallel through the first jumper wire and the second auxiliary lead.

The embodiment of the utility model provides a technical scheme, through setting up the first wire jumper of being connected with each battery cluster, make each battery cluster divide into two parts by first wire jumper, the same part of all battery clusters is reverse parallelly connected same diode respectively, the diode only with the partly reverse parallel connection of each battery cluster, compare in prior art every diode and the reverse parallel connection's of each whole string battery cluster mode, the parallelly connected battery cluster quantity of diode is unchangeable, but the proportion reduces, under the prerequisite that guarantees that the diode is not punctured, the quantity of battery piece increases in every partial battery cluster parallelly connected with the diode, and then the problem that the diode that easily leads to when having avoided increasing photovoltaic module middle battery piece quantity is punctured backward appears. 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 diagram of the photovoltaic module of FIG. 3;

FIG. 5 is a schematic view of yet another construction of the photovoltaic module of FIG. 3;

fig. 6 is a schematic structural diagram of a divided battery piece according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another divided battery piece according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a conventional back electrode of a battery cell according to an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view taken along the dashed line AB of FIG. 5;

fig. 10 is a schematic cross-sectional structure diagram of a jumper according to an embodiment of the present invention;

fig. 11 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present invention;

fig. 12 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an 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;

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;

410-a first diode;

420-a second diode;

320-a second jumper;

321-a first subsection;

322-the second subsection;

140-an insulating layer;

250-a third sub-string;

260-fourth sub-string;

240-dividing the battery piece;

241-a first sub-sheet;

242-a second sub-sheet;

500-a back electrode;

510-a first sub-electrode;

520-a second sub-electrode;

610-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 objects of the present invention, the following detailed description of the embodiments, structures, features and effects of a photovoltaic module according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

The embodiment of the utility model provides a photovoltaic module, including at least two parallel connection's battery cluster, the battery cluster includes a plurality of series connection's battery piece; the battery string comprises a first sub string and a second sub string which are connected in series, and the connection point of the first sub string and the second sub string is a string connection point;

the first jumper wire is connected with all the string connecting points;

The embodiment of the utility model provides a technical scheme, through setting up the first wire jumper of being connected with each battery cluster, make each battery cluster divide into two parts by first wire jumper, the same part of all battery clusters is reverse parallelly connected same diode respectively, the diode only with the partly reverse parallel connection of each battery cluster, compare in prior art every diode and the reverse parallel connection's of each whole string battery cluster mode, the parallelly connected battery cluster quantity of diode is unchangeable, but the proportion reduces, under the prerequisite that guarantees that the diode is not punctured, the quantity of battery piece increases in every partial battery cluster parallelly connected with the diode, and then the problem that the diode that easily leads to when having avoided increasing photovoltaic module middle battery piece quantity is punctured backward appears.

The above is the core idea of the present application, and the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, under the premise that creative work is not done by ordinary skilled in the art, all other embodiments obtained all 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 one skilled in the art may readily devise many other varied embodiments that are not limited to the specific details disclosed herein.

Next, the present invention will be described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, for convenience of explanation, the schematic drawings showing the structure of the device are not partially enlarged according to the general scale, 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. As shown in fig. 3, the photovoltaic module includes at least two cell strings 110 connected in parallel, and the cell strings 110 include a plurality of cell sheets 111 connected in series. Battery string 110 includes first sub-string 210 and second sub-string 220 connected, and the connection point of first sub-string 210 and second sub-string 220 is string connection point 230. The photovoltaic module further comprises a first jumper 310, a first auxiliary lead 330 and a second auxiliary lead 340, all the string connection points 230 are connected with the first jumper 310, each first sub-string 210 is reversely connected with a first diode 410 in parallel through the first jumper 310 and the first auxiliary lead 330, each second sub-string 220 is reversely connected with a second diode 420 in parallel through the first jumper 310 and the second auxiliary lead 340, and the cell piece 111 is a one-third cell piece formed by cutting a whole cell piece.

The first diode 410 and the second diode 420 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 lead 330 and the second auxiliary lead 340 are used to realize the anti-parallel connection of each first sub-string 210 and the first diode 410, and the anti-parallel connection of each second sub-string 220 and the second diode 420, and are arranged in an insulated manner from other conductive structures in the photovoltaic module. The present embodiment does not specifically limit the manner in which the first jumper 310, the first auxiliary conductor 330, and the second auxiliary conductor 340 are insulated from other conductive structures in the photovoltaic module. For example, an insulating 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 may include a peripheral insulating layer.

In addition, the position relationship and the arrangement manner of the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 are not specifically limited, and the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 may have any structure on the premise that the corresponding functions of the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 can be realized.

Optionally, the first diode 410 and the second diode 420 may be disposed in the same junction box to simplify the structure of the photovoltaic module. It is understood that in other embodiments of the present embodiment, the first diode 410 and the second diode 420 may be disposed in different junction boxes respectively.

According to the technical scheme provided by the embodiment, the first jumper 310 connected with each battery string 110 is arranged, so that each battery string 110 is divided into two parts by the first jumper 310, the same parts of all the battery strings 110 are respectively connected with the same diode in a reverse parallel mode, and the diodes are only connected with one part of each battery string in a reverse parallel mode.

Fig. 4 is a schematic diagram of the structure of the photovoltaic module of fig. 3. As shown in fig. 4, all the battery pieces 111 are arranged in N rows and H columns, each battery piece 111 in the same battery piece column is connected in series to form a battery string 110, and H battery strings 110 are connected in parallel, where N and H are positive integers greater than 1.

Specifically, in fig. 4, N is 24 and H is 6. In this embodiment, N is only 24 and H is 6, which are taken as examples and not limited, in other embodiments of this embodiment, N may be a value other than 24, and H may be a value other than 6.

It should be noted that, the photovoltaic module structure shown in fig. 4 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 continued reference to fig. 4, 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, the first jumper 310 extends along the extending direction X of the battery piece row, and the first jumper 310 is connected to each string connection point (not shown), where L is a positive integer smaller than N.

The second jumper wire 320 extending along the extending direction Y of the battery plate column is disposed between any two adjacent columns of battery plates 111, the second jumper wire 320 is electrically connected to the first jumper wire 310 at an intersection point, the second jumper wire 320 includes a first sub-portion 321 and a second sub-portion 322, the first sub-portion 321 is located on one side of the first jumper wire 310 close to each first sub-string 210, a connection point of the first sub-portion 321 and the second sub-portion 322 is the intersection point, the first sub-portion 321 is a first auxiliary lead 330, and the second sub-portion 322 is a second auxiliary lead 340.

Specifically, in fig. 4, L is 12, and in other embodiments of this embodiment, L may have other reasonable values. It is understood that the number of battery sheets 111 in first sub-string 210 and second sub-string 220 may be the same or different. Compared with the photovoltaic module structure in the prior art shown in fig. 1, the photovoltaic module structure provided by this embodiment is suitable for the case where the total number of the battery pieces 111 is not a multiple of 4, and can also be suitable for the case where the total number of the battery pieces 111 is a multiple of 4, so that the application range is wider, and the internal structure of the battery array is divided in a more flexible and various manner.

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. 5 is a schematic view of another construction of the photovoltaic module of fig. 3. As shown in fig. 5, the photovoltaic module includes at least two cell strings 110 connected in parallel, the cell string 110 includes a plurality of cell sheets 111 connected in series, each cell string 110 includes divided cell sheets 240, a third sub-string 250 and a fourth sub-string 260, and the divided cell sheets 240 are connected with the third sub-string 250 and the fourth sub-string 260.

Fig. 6 is a schematic structural diagram of a divided battery piece according to an embodiment of the present invention. As shown in fig. 6, the divided cell sheet 240 includes a back electrode 500, the back electrode 500 includes a plurality of first sub-electrodes 510 arranged in parallel and a second sub-electrode 520 intersecting each of the first sub-electrodes 510, and the second sub-electrode 520 divides the divided cell sheet 240 into a first sub-sheet 241 and a second sub-sheet 242 connected in series. Optionally, fig. 7 is a schematic structural diagram of another divided battery piece according to an embodiment of the present invention. The structure of the divided cell sheet shown in fig. 7 is similar to that of the divided cell sheet shown in fig. 6, except that the second sub-electrode 520 in fig. 7 includes a plurality of discrete first and second sub-electrodes 521, and a first and second sub-electrode 521 is disposed between every two adjacent first sub-electrodes 510.

With continued reference to fig. 5, the first sub-tab 241 is connected to the third sub-string 250, the second sub-tab 242 is connected to the fourth sub-string 260, and the second sub-electrodes (not shown) in each of the divided cell tabs 240 are electrically connected by the first jumper 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, each first sub-group is reversely connected with the first diode 410 in parallel through the first jumper 310 and the first auxiliary lead, each second sub-group is reversely connected with the second diode 320 in parallel through the first jumper 310 and the second auxiliary lead, wherein the other battery sheets 111 except the divided battery sheet 240 are one third battery sheets formed by cutting the whole battery sheet.

Further, the first diode 410 and the second diode 420 may be disposed in the same junction box, or the first diode 410 and the second diode 420 may be disposed in different junction boxes, which is not limited in this embodiment.

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 particularly 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 610, as shown in fig. 8; 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 520 is not disposed on the back electrode in the conventional structure, and the silver paste used is less and the cost is lower compared to the back electrode structure including the first sub-electrode 510 and the second sub-electrode 520. Therefore, the back electrodes of the other battery pieces 111 except for the split battery piece 240 are preferably arranged in a manner of a back electrode with a conventional structure, so as to ensure that the split battery pieces 240 with the second sub-electrodes 520 can realize the splitting 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 520 which cannot be used is avoided.

Optionally, with reference to fig. 5, all the battery pieces 111 are arranged in P rows and K columns, each battery piece 111 in the same battery piece column is connected in series to form a battery string 110, and the K battery strings 110 are connected in parallel, where P and K are positive integers greater than 2.

Further, as shown in fig. 5, the cell 111 in the mth row in each cell column is a divided cell 240, the first sub-electrode 510 extends along the extending direction Y of the cell column, and the second sub-electrode 520 and the first jumper 310 both extend along the extending direction X of the cell row. A second jumper 320 extending along the Y direction of the extension of the cell column is arranged between the 3 rd column and the 4 th column of the cells 111, the second jumper 320 is electrically connected with the first jumper 310 at an intersection point, the second jumper 320 comprises a first sub-part 321 and a second sub-part 322, the first sub-part 321 is positioned at one side of the first jumper 310 close to each third sub-string 250, the connection point of the first sub-part 321 and the second sub-part 322 is the intersection point, the first sub-part 321 is a first auxiliary lead 330, the second sub-part 322 is a second auxiliary lead 340, wherein M is a positive integer greater than 1 and less than N.

Specifically, in fig. 5, P is 23, K is 6, and M is 13. It is understood that P, K and M may also take other reasonable values in other embodiments of this embodiment, and this embodiment is not limited in this time.

It should be noted that, in the photovoltaic module structure shown in fig. 5, 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 further, the second sub-electrodes of the divided cells 240 can be connected through the first jumper 310, so as to divide 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.

For example, the divided cell piece 240 may be a two-thirds cell piece cut from a whole cell piece, and the first sub-piece 241 and the second sub-piece 242 have the same size.

In such a design, the first sub-sheet 240 and the second sub-sheet 242 are both equivalent to one third of the cell sheets, and are further the same as the other cell sheets 111 in the cell string 110, and when the corresponding cell string 110 is divided by adopting the divided cell sheets 240, the cell sheets 111 connected in series in the first sub-string 210 and the second sub-string 220 are equivalent to the same cell sheets, which is convenient for design and calculation of electrical performance of the photovoltaic module.

Illustratively, as shown in fig. 4 and 5, a photovoltaic module may include six strings 110 of cells connected in parallel.

It should be noted that the photovoltaic resistor structures shown in fig. 4 and 5 adopt the conventional width of the photovoltaic module in the prior art, that is, the width of the 6 battery strings 110, so that the characteristic size of the photovoltaic module is not significantly increased, the layout is convenient, and the increase of the design difficulty is avoided.

Alternatively, with continued reference to fig. 4 and 5, the number of the battery cell columns on opposite sides of the second jumper wire 320 may be equal along the battery cell row extending direction X.

It should be noted that, the structure of the photovoltaic module is more regular due to the arrangement, and the structural aesthetic feeling of the photovoltaic module is increased.

Optionally, the number of the battery sheets 111 in the battery string 110 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.

Fig. 9 is a schematic sectional view along the broken line AB in fig. 4. As shown in fig. 9, in a vertical direction Z of a plane of the battery sheet array 10, the first jumper 310 and the second jumper 320 are partially overlapped with the battery sheet array 10, and at least in an overlapping area of the first jumper 310 and the second jumper 320 and the battery sheet array, an insulating layer 140 is disposed between the first jumper 310 and the second jumper 320 and the battery sheet array 10.

It should be noted that in order to prevent the first jumper wire 310 and the second jumper wire 320 from being electrically connected to the battery sheet array 10 and affecting the normal operation of the battery sheet array 10, an insulating layer 140 is disposed between the overlapping portions of the first jumper wire 310 and the second jumper wire 320 and the battery sheet array 10.

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.

Optionally, the thickness value range of the first jumper 310 and the second jumper 320 is 0.05-0.15 mm, and the width value range of the first jumper 310 and the second jumper 320 is 1-5 mm.

It should be noted that the excessive thickness of the jumper wire may affect the overall thickness of the photovoltaic module, the insufficient thickness of the jumper wire may affect the electrical performance of the jumper wire, and in addition, the too wide width of the jumper wire may cause the occupied space to be large, thereby increasing the probability of the electrical connection between the jumper wire and the cell matrix, and the insufficient width of the jumper wire may affect the electrical performance connection characteristics between the jumper wire and the first connection point and the second connection point, and accordingly, the thickness value range of the first jumper wire 310 and the second jumper wire 320 set in the preferred embodiment is 0.05-0.15 mm, and the width value range of the first jumper wire 310 and the second jumper wire 320 is 1-5 mm.

Optionally, fig. 10 is a schematic cross-sectional structure diagram of a jumper wire provided in an embodiment of the present invention. As shown in fig. 10, 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 310 and the second jumper wire 320 may be both in the jumper structure shown in fig. 10, or either one of the first jumper wire 310 and the second jumper wire 320 is in the jumper structure shown in fig. 10, and the other one is insulated from the battery cell array in other manners.

With continued reference to fig. 5, in the present embodiment, the adjacent battery cells 111 in the same battery string 110 may be connected in series by the interconnection bar, and along the extending direction Y of the battery cell column, the ends of the battery string 110 located on the same side as the first jumper 310 are electrically connected by the bus bar 700, and the bus bar 700 extends along the extending direction X of the battery cell row.

Optionally, the first jumper 310 and the second jumper 320 do not overlap with the interconnection bar in a direction perpendicular to a plane of the cell array. It should be noted that the formed interconnection bar has a certain height, and protrudes above the surface of the battery cell array, and in order to avoid the problem that the lamination of the first jumper 310, the second jumper 320, the insulating layer 140 and the interconnection bar further increases the local height, and further the lamination split occurs, the first jumper 310 and the second jumper 320 are arranged to be not overlapped with the interconnection bar.

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. 11 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present invention. As shown in fig. 11, the preparation method of the photovoltaic module may specifically include the following steps:

step 11, forming a main circuit of the photovoltaic module, wherein the main circuit comprises at least two battery strings connected in parallel, and each battery string comprises a plurality of battery pieces connected in series; the battery string comprises a first sub string and a second sub string which are connected in series, and the connection point of the first sub string and the second sub string is a string connection point.

And step 12, forming a first jumper, a first auxiliary lead and a second auxiliary lead, wherein the first jumper is connected with all the string connecting points, and the first auxiliary lead and the second auxiliary lead are both connected with the first jumper.

And step 13, connecting the first diode and the second diode, so that each first sub-string is reversely connected with the first diode in parallel through the first jumper wire and the first auxiliary lead, and each second sub-string is reversely connected with the second diode in parallel through the first jumper wire and the second auxiliary lead.

In the technical scheme provided by the embodiment, the 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 the main circuit, the first substring in each battery string is reversely connected with one diode in parallel through the jumper wire and other auxiliary leads, the second substring except the first substring in each battery string is reversely connected with another diode in parallel through the first jumper wire and other auxiliary leads, the diodes are connected with a part of the battery strings in an inverse parallel way, compared with the mode that each diode is connected with the battery strings in the whole string in the inverse parallel way in the prior art, the number of the battery strings connected with the diodes in parallel is unchanged, but the proportion is reduced, on the premise of ensuring that the diode is not broken down, the number of the battery pieces in each partial battery string connected with the diode in parallel 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, forming the main circuit of the photovoltaic module may include: arranging all the battery pieces into N rows and H rows, connecting all the battery pieces in the same battery piece row in series to form a battery string, and connecting H battery strings in parallel; wherein N and H are both positive integers greater than 1.

Furthermore, L battery slices 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 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 the first jumper, the first auxiliary conductor, and the second auxiliary conductor includes: and a first jumper extending along the extending direction of the battery piece row is formed between the L-th row and the L + 1-th row of battery pieces, and the first jumper is electrically connected with all the string connection points. And a second jumper wire extending along the extending direction of the battery plate column is arranged between any two adjacent columns of battery plates, the second jumper wire is electrically connected with the first jumper wire at an intersection point, the second jumper wire comprises a first sub-part and a second sub-part, the connection point of the first sub-part and the second sub-part is the intersection point, the first sub-part is a first auxiliary lead, and the second sub-part is a second auxiliary lead.

Fig. 12 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present invention. As shown in fig. 12, 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 two battery strings connected in parallel, and each battery string comprises a plurality of battery pieces 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 electrically 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.

And step 22, forming a first jumper, a first auxiliary lead and a second auxiliary lead, wherein the first jumper is connected with the second sub-electrodes of the divided battery pieces, and the first auxiliary lead and the second auxiliary lead are both connected with the first jumper.

And step 23, connecting the first diodes and the second diodes, so that each first subgroup is reversely connected in parallel with the first diodes through the first jumper wires and the first auxiliary wires, and each second subgroup is reversely connected in parallel with the second diodes through the first jumper wires and the second auxiliary wires.

According to the technical scheme provided by the embodiment, the divided battery pieces in each battery string are provided with the second sub-electrodes, so that after each second sub-electrode is connected with the first jumper, the first jumper can divide each battery string into two parts, each part is respectively a diode connected with the two parts in parallel in a reverse direction, the diodes are only connected with one part of each battery string in parallel in a reverse direction, compared with the mode that each diode is connected with each whole battery string in parallel in a reverse direction in the prior art, the number of the battery strings connected with the diodes in parallel 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 with the diodes in parallel is increased, and the problem that the diodes are easily broken down in a reverse direction when the number of the battery pieces in the photovoltaic module is increased is.

Optionally, forming the main circuit of the photovoltaic module may include: arranging all the battery pieces into P rows and K rows, connecting all the battery pieces in the same battery piece row in series to form a battery string, and connecting K battery strings in parallel; wherein, P and K are both positive integers larger than 2.

Furthermore, the battery piece positioned in the M-th row in each battery piece row is a divided battery piece, the first sub-electrode extends along the extending direction of the battery piece row, and the second sub-electrode extends along the extending direction of the battery piece row; wherein M is a positive integer greater than 1 and less than N. Forming the first jumper, the first auxiliary conductor, and the second auxiliary conductor includes: the first jumper wire extending along the extending direction of the battery piece row is formed, the second jumper wire extending along the extending direction of the battery piece row is arranged between any two adjacent columns of battery pieces, the second jumper wire is electrically connected with the first jumper wire at an intersection point, the second jumper wire comprises a first sub-portion and a second sub-portion, the connection point of the first sub-portion and the second sub-portion is the intersection point, the first sub-portion is a first auxiliary lead, and the second sub-portion is a second auxiliary lead.

Illustratively, for the photovoltaic module fabrication methods provided in fig. 11 and 12, each jumper overlaps a cell array member in a direction perpendicular to the plane of the cell array. Before forming the first jumper, the first auxiliary conductor and the second auxiliary conductor, 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 methods of manufacturing the photovoltaic modules provided in fig. 11 and 12, 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 first jumper, the first auxiliary conductor and the second auxiliary conductor, 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 jumpers and second jumpers.

In addition, for the preparation method of the photovoltaic module provided in fig. 11 and 12, the connecting the first diode and the second diode may each include: the first diode and the second diode are installed in the same junction box, and then the junction box is connected with the main circuit, the first jumper wire, the first auxiliary lead and the second auxiliary lead.

It is worth noting that, according to the technical scheme provided by this embodiment, on the basis of a conventional battery piece array structure, the reduction of the reverse parallel battery string proportion of each diode is realized by simply adding the first jumper wire and the second jumper wire, the whole preparation process does not need to redesign the layout of the battery piece array, the process is simple and easy to implement, the additionally added jumper wires do not increase the width of the battery piece array, and the increase of the size of the battery piece is avoided.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. 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 with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A photovoltaic module comprising at least two parallel-connected cell strings, said cell strings comprising a plurality of series-connected cells; the battery string comprises a first sub string and a second sub string which are connected in series, and the connection point of the first sub string and the second sub string is a string connection point;

the first jumper wire is connected with all the string connecting points;

2. The photovoltaic module according to claim 1, wherein all the cells are arranged in N rows and H columns, each cell in the same cell column is connected in series to form the cell string, and H cell strings are connected in parallel; wherein N and H are both positive integers greater than 1.

3. The photovoltaic module according to claim 2, wherein L of the cell pieces in each of the cell strings located in the 1 st row to the L th row form the first sub-string, N-L of the cell pieces in each of the L +1 th row to the N th row form the second sub-string, the first jumper is disposed 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 electrically connected to each of the string connection points; wherein L is a positive integer less than N.

4. The photovoltaic module according to claim 3, wherein a second jumper extending along the extending direction of the cell columns is disposed between any two adjacent columns of the cells, the second jumper is electrically connected to the first jumper at an intersection, the second jumper includes a first sub-section and a second sub-section, the first sub-section is located on a side of the first jumper close to each of the first sub-strings, a connection point of the first sub-section and the second sub-section is the intersection, the first sub-section is the first auxiliary lead, and the second sub-section is the second auxiliary lead.

5. A photovoltaic module comprising at least two parallel-connected cell strings, said cell strings comprising a plurality of series-connected cells; each battery string comprises a divided battery piece, a third sub string and a fourth sub string, and the divided battery pieces are electrically 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;

6. The photovoltaic module according to claim 5, wherein all the cells are arranged in P rows and K columns, each cell in the same cell column is connected in series to form the cell string, and K cell strings are connected in parallel; wherein, P and K are both positive integers larger than 2.

7. The photovoltaic module according to claim 6, wherein the cell in the M-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 M is a positive integer greater than 1 and less than N.

8. The photovoltaic module according to claim 7, wherein a second jumper extending along the extending direction of the cell columns is disposed between any two adjacent columns of the cells, the second jumper is electrically connected to the first jumper at an intersection, the second jumper includes a first sub-section and a second sub-section, the first sub-section is located on a side of the first jumper close to each of the third sub-strings, a connection point of the first sub-section and the second sub-section is the intersection, the first sub-section is the first auxiliary lead, and the second sub-section is the second auxiliary lead.

9. The assembly according to claim 5, wherein the divided cell pieces are two-thirds cut from a single cell piece, and the first sub-piece and the second sub-piece are equal in size.

10. The photovoltaic module of claim 5, wherein the second sub-electrode comprises a plurality of spaced-apart first sub-electrodes.

11. The photovoltaic module of claim 10, wherein one of the first and second sub-electrodes is disposed between each adjacent two of the first sub-electrodes.

12. A photovoltaic module according to claim 1 or 5, characterized in that the photovoltaic module comprises six strings of cells connected in parallel.

13. The photovoltaic module according to claim 4 or 8, wherein the number of the cell columns on opposite sides of the second jumper is equal along the extending direction of the cell rows.

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

15. The photovoltaic module according to claim 4 or 8, wherein the first jumper and the second jumper are partially overlapped with the cell array along a direction perpendicular to a plane of the cell array, and an insulating layer is arranged between each jumper and the cell array in at least an overlapping area of the jumper and the cell array.

16. The photovoltaic module of claim 15, 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.

17. The photovoltaic module of claim 15, wherein the insulating layer is a reflective film.

18. The photovoltaic module according to claim 4 or 8, wherein the thickness of the first jumper and the second jumper ranges from 0.05 mm to 0.15mm, and the width of the first jumper and the second jumper ranges from 1 mm to 5 mm.

19. The photovoltaic module of claim 4 or 8, wherein the first and second jumper each comprise a central conductor and a peripheral insulation layer wrapped outside the central conductor.

20. The photovoltaic module according to claim 4 or 8, wherein adjacent cells in the same cell string are connected in series by an interconnection bar; and along the extending direction of the battery piece columns, the ends of the battery strings positioned on the same side of the first jumper are electrically connected through bus bars, and the bus bars extend along the extending direction of the battery piece rows.