CN210379081U

CN210379081U - Photovoltaic module

Info

Publication number: CN210379081U
Application number: CN201921553362.8U
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. In the same cell unit group in the photovoltaic module, a first connecting point of two series-connected first cell strings is electrically connected with a second connecting point of two series-connected second cell strings through a jumper wire, the jumper wire comprises a first sub-part and a second sub-part which are mutually connected, the first cell string and the second cell string which have common endpoints are respectively connected with the same diode through different sub-parts of the jumper wire in a reverse parallel mode, and the cell is a half cell formed by cutting a whole cell. The embodiment of the utility model provides a technical scheme is guaranteeing under the prerequisite that the diode was not punctured, and the quantity of battery piece increases in every battery string, and then the problem of the diode that easily leads to when having avoided increasing photovoltaic module middle cell piece quantity is by reverse breakdown 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 each two cell strings 1 form a series structure 2, each two series structures 2 form a parallel structure 3, and the parallel structures 3 are connected in series. Further, every two series structures 2 forming the parallel structure 3 are reversely connected with the same diode 4 in parallel, and the number of the battery pieces 5 protected by each diode 4 is the number of the battery pieces 5 in the series structures 2, namely the number of the total battery pieces 5 in the two battery strings 1, so that the number of the battery pieces 5 in the battery strings 1 is limited by the reverse voltage-resisting capacity of the diode 4, the number of the total battery pieces 5 in the photovoltaic module cannot be increased, and the performance improvement of the photovoltaic module is affected.

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 one battery cell group, where the battery cell group includes a first battery cell and a second battery cell connected in parallel;

the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series;

the first battery string and the second battery string both comprise a plurality of battery pieces which are connected in series and are equal in number;

in the same battery cell group, a first connection point of two first battery strings connected in series is electrically connected with a second connection point of two second battery strings connected in series through a jumper wire, the jumper wire comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have any common end point are respectively connected with the same diode in an inverse parallel mode through different sub-parts of the jumper wire;

the battery piece is a half battery piece formed by cutting a whole battery piece.

In a second 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 one cell group; the battery cell group comprises a first battery cell and a second battery cell which are connected in parallel; the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series; the first battery string and the second battery string respectively comprise a plurality of battery pieces which are connected in series and are equal in number, wherein the battery pieces are half battery pieces formed by cutting a whole battery piece;

forming at least one jumper wire electrically connecting first connection points of two series-connected first battery strings and second connection points of two series-connected second battery strings in the battery cell group; the jumper includes a first subsection and a second subsection connected to each other;

electrically connecting a plurality of diodes to the main circuit and the jumper, each of the diodes being connected in anti-parallel with any one of the first battery string and the second battery string having a common terminal through different sub-sections of the jumper, respectively.

The technical proposal provided by the embodiment of the utility model is that a jumper wire is electrically connected between the first connecting point of two first battery strings connected in series and the second connecting point of two second battery strings connected in series in each battery cell group, wherein the jumper comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have a common endpoint are connected in parallel in an inverse way through different sub-parts of the jumper, the diode is connected with only one first battery string and one second battery string in parallel, compared with the mode that each diode is connected with two first battery strings and two second battery strings in parallel in the prior art, the number of the battery strings connected with the diode in parallel is reduced, on the premise of ensuring that the diode is not broken down, the number of the cells in each cell string is increased, and the problem that the diode is broken down reversely when the number of the cells in the photovoltaic module is increased is solved. 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 according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the photovoltaic module of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along the dashed line AB in FIG. 3;

fig. 5 is a schematic cross-sectional structure diagram of a jumper according to an embodiment of the present invention;

fig. 6 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;

100-cell stack;

110-a first battery cell;

120-a second battery cell;

101-a first battery string;

102-a second battery string;

201-battery piece;

300-jumper wire;

310-the first sub-section;

320-the second subsection;

200-a diode;

o-a first connection point;

p-a second attachment point;

400-an insulating layer;

600-L-shaped lead-out wires;

601-first side;

602-a second edge;

500-a central bus bar;

501-a partition area;

111-a first battery cell;

112-b first battery cell;

113-c first battery cell;

121-a second battery cell;

122-b second battery cell;

a second 123-c battery cell;

700-edge bus bar;

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 one battery cell group, the battery cell group includes first battery cell and the second battery cell of parallel connection;

The technical proposal provided by the embodiment of the utility model is that a jumper wire is electrically connected between the first connecting point of two first battery strings connected in series and the second connecting point of two second battery strings connected in series in each battery cell group, wherein the jumper comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have a common endpoint are connected in parallel in an inverse way through different sub-parts of the jumper, the diode is connected with only one first battery string and one second battery string in parallel, compared with the mode that each diode is connected with two first battery strings and two second battery strings in parallel in the prior art, the number of the battery strings connected with the diode in parallel is reduced, on the premise of ensuring that the diode is not broken down, the number of the cells in each cell string is increased, and the problem that the diode is broken down reversely when the number of the cells in the photovoltaic module is increased is solved.

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. 2 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention. As shown in fig. 2, the photovoltaic module includes at least one cell stack 100, the cell stack 100 includes a first battery cell 110 and a second battery cell 120 connected in parallel, the first battery cell 110 includes two first battery strings 101 connected in series, the second battery cell 120 includes two second battery strings 102 connected in series, and each of the first battery strings 101 and the second battery strings 102 includes a plurality of battery sheets 201 connected in series and equal in number. In the same battery cell group 100, the first connection point O of the two first battery strings 101 connected in series and the second connection point P of the two second battery strings 102 connected in series are electrically connected through the jumper 300, the jumper 300 includes the first sub-part 310 and the second sub-part 320 connected to each other, the first battery string 101 and the second battery string 102 having any common end point are respectively connected in reverse parallel with the same diode 200 through different sub-parts of the jumper 300, and the battery piece 201 is a half battery piece cut from a whole battery piece.

The diode 200 can prevent the first battery unit 110 or the second battery unit 120 connected in parallel from generating a hot spot effect when being blocked. In addition, the reason why the first battery cell 110 and the second battery cell 120 in each battery cell group 100 are connected in parallel is that: when all the cells 201 are connected in series, the output voltage across the photovoltaic module is large, and the arrangement can reduce the output voltage of the photovoltaic module by half.

It should be noted that the jumper 300 is used to electrically connect the first connection point O and the second connection point P, and is insulated from other conductive structures. The insulating manner of the jumper 300 and other conductive structures is not particularly limited in this embodiment, and for example, an insulating layer may be disposed between the jumper 300 and other conductive structures, or the jumper 300 includes a peripheral insulating layer.

In the present embodiment, the first sub-portion 310 and the second sub-portion 320 of the jumper 300 may be an integrally formed structure, or may be a separate structure, and preferably, both are integrally formed for easy manufacturing.

For example, two diodes 200 per cell group 100 may be disposed in the same junction box, which is advantageous for simplifying the structure of the photovoltaic module. It is understood that all the diodes 200 corresponding to each battery cell group 100 may be further disposed in the same junction box, which is not specifically limited in this embodiment.

In the solution provided in this embodiment, a jumper 300 is electrically connected between the first connection point O of two first battery cells 110 connected in series and the second connection point P of two second battery cells 120 connected in series in each battery cell group 100, wherein the jumper 300 includes a first sub-part 310 and a second sub-part 320 connected with each other, and the first battery cell 110 and the second battery cell 120 having any common terminal are connected in parallel with the same diode 200 in an inverse direction through different sub-parts of the jumper 300, so that the diode 200 is connected in parallel with only one first battery cell 110 and one second battery cell 120, compared with the prior art in which each diode 200 is connected in parallel with two first battery cells 110 and two second battery cells 120, the number of battery strings connected in parallel with the diode 200 is reduced, and the number of battery sheets 201 in each battery string is increased on the premise that the diode 200 is not broken down, and further, the problem that the diode 200 is subjected to reverse breakdown easily caused by increasing the number of the cell sheets 210 in the photovoltaic module is avoided.

Further, with continued reference to fig. 2, the number of at least one cell stack 100 is three, and adjacent cell stacks 100 are connected in series.

It should be noted that the photovoltaic resistor structure shown in fig. 2 adopts the conventional width of the photovoltaic module in the prior art, that is, the width of 6 battery strings, 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.

It is to be understood that in other embodiments of the present embodiment, the adjacent battery cell groups 100 may be connected in parallel, and the present embodiment is not particularly limited thereto, and only the adjacent battery cell groups 100 are connected in series as an example.

Optionally, the number of the battery slices 201 in the first battery string 101 and the second battery string 102 is greater than or equal to 12.

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. 1, the reverse voltage of each diode is equal to the total voltage of two series strings of cells connected in parallel, so the number of cells in each string is at most 12, and the number of cells in the photovoltaic module shown in fig. 1 is at most 144. In the photovoltaic module provided in this embodiment, the reverse voltage of each diode is equal to the voltage of one cell string, and the number of the cells in each cell string may be up to 24, that is, compared to the scheme in which the number of the cells in the cell string is up to 12 in fig. 1, the number of the cells in each cell string in the photovoltaic module provided in this embodiment may be increased by one time, and further, the total number of the cells in the photovoltaic module may be increased by one time when the number of the cell strings is equal. Based on the above analysis, the number of the cells in the first cell string and the second cell string is set to be greater than the maximum number of the cells that the cell string in the prior art can contain, that is, 12 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. And the number of the battery pieces in the first battery string and the second battery string can be equal to the maximum number of the battery pieces which can be contained in the battery string in the prior art, namely 12 battery pieces, at the moment, the number of the battery pieces which are connected in parallel with each diode is far smaller than the number of the battery pieces which can be loaded at the maximum, and compared with the prior art in which the diode needs to adopt the maximum reverse voltage-resistant load-bearing 12 battery pieces, the probability of reverse breakdown of the diode is effectively reduced due to the performance fluctuation of the diode caused by the influence of process errors in the technical scheme provided by the embodiment.

Fig. 3 is a schematic diagram of the structure of the photovoltaic module of fig. 2. As shown in fig. 3, all the cells 201 in the photovoltaic module are arranged in N rows and M columns, the extending direction of the cell rows is a first direction X, the extending direction of the cell columns is a second direction Y, and the jumper 300 extends along the second direction Y, where N and M are even numbers. N/2 battery pieces 201 in the 1 st row to the N/2 nd row in each battery piece column are sequentially connected in series to form a first battery string 101, and N/2 battery pieces 201 in the N/2+1 st row to the N nd row are sequentially connected in series to form a second battery string 102. Two first battery strings 101 respectively positioned in the nth column and the (n + 1) th column are connected in series to form a first battery unit 110, and two second battery strings 102 respectively positioned in the nth column and the (n + 1) th column are connected in series to form a second battery unit 120, wherein n is 2p +1, p is a non-negative integer, and n is less than M. The first battery cell 110 and the second battery cell 120 arranged in the second direction Y are connected in parallel as the battery cell group.

Specifically, in fig. 3, N is equal to 24 and M is equal to 6. With continued reference to fig. 3, the two first battery strings 101 located in the 1 st and 2 nd columns are serially connected as a first battery unit 111, the two first battery strings 101 located in the 3 rd and 4 th columns are serially connected as a second first battery unit 112, and the two first battery strings 101 located in the 5 th and 6 th columns are serially connected as a third first battery unit 113. The two second battery strings 102 in the 1 st and 2 nd columns are connected in series to form a second battery unit 121, the two second battery strings 102 in the 3 rd and 4 th columns are connected in series to form a second battery unit 122, and the two second battery strings 102 in the 5 th and 6 th columns are connected in series to form a third battery unit 123. The first and

second battery cells

111 and 121 are arranged in the second direction Y and are connected in parallel to form a battery cell group. Similarly, the first battery cell b 112 and the second battery cell b 122 are connected in parallel to form a battery cell group, and the first battery cell c 113 and the second battery cell c 123 are connected in parallel to form a battery cell group. Optionally, the three battery cell groups are connected in series.

It should be noted that, in fig. 3, only N is equal to 24 and M is equal to 6, which are taken as an example and not a limitation, and in other embodiments of this embodiment, N and M may be other even numbers.

It should be further noted that the structure of the photovoltaic module shown in fig. 3 enables all the cells 201 to be regularly and tightly arranged, which facilitates the electrical connection between the adjacent cells 201 on one hand, and facilitates the reduction of the occupied space of the whole photovoltaic module on the other hand.

Illustratively, as shown in fig. 3, the photovoltaic module further includes a center bus bar 500 along the first direction, the center bus bar 500 is disposed in the gap between the N/2 th row and the N/2+1 th row of the cells 201, and the first cell unit 110 and the second cell unit 120 arranged along the second direction Y are connected in parallel to the center bus bar 500.

Optionally, the central bus bar 500 includes M/2 partition regions 501, the partition regions 501 are located between two common endpoints in the battery cell group, and one diode 200 is electrically connected between the endpoint of the two central bus bars 500 formed by the partition regions 501 and the jumper 300.

It should be noted that, in the present embodiment, the central bus bar 500 is used to implement parallel connection between each first battery unit 110 and the corresponding second battery unit 120, which is beneficial to reducing design and process difficulties, and has a simple structure, and has little influence on normal operation of the photovoltaic module.

Alternatively, referring to fig. 3, a connection point of the first sub-portion 310 and the second sub-portion 320 of the jumper 300 may be electrically connected to an L-shaped lead-out line 600, a first side 601 of the L-shaped lead-out line 600 is attached to the jumper 300, a second side 602 of the L-shaped lead-out line 600 is perpendicular to a plane where the cell array is located, the L-shaped lead-out lines 600 correspond to the partition regions 501 one by one, and one diode 200 is electrically connected between end points of two central bus bars formed by the partition regions 501 and the second side 602 of the corresponding L-shaped lead-out line 600.

It should be noted that the L-shaped outgoing line 600 is a dielectric medium for electrically connecting the jumper 300 and the two corresponding diodes 200, and such a setting process is simple and easy to implement, and can reduce the number of connecting lines, which is beneficial to simplifying the structure of the photovoltaic module.

It should be noted that, in the present embodiment, only the jumper 300 and the two corresponding diodes 200 are electrically connected through the L-shaped outgoing line 600 for illustration and not limitation, and any structure capable of electrically connecting the jumper 300 and the two corresponding diodes 200 is within the protection scope of the present embodiment.

With continued reference to fig. 3, the photovoltaic module may further include M edge-connecting bus bars 700, wherein ends of the two first cell strings 101, which are respectively located at the nth column and the (n + 1) th column, which are away from the central bus bar 500, are connected in series through the edge-connecting bus bars 700, and ends of the two second cell strings 102, which are respectively located at the nth column and the (n + 1) th column, which are away from the central bus bar 500, are connected in series through the edge-connecting bus bars 700.

It should be noted that the edge connection bus bar 700 can be disposed outside the cell array, and it does not intersect with the cell array, and does not affect the normal operation of the photovoltaic module, and does not affect the overall occupied space of the cell array.

It should be noted that the edge connection bus bar 700, the center bus bar 500, and the jumper wire 300 can be formed in the same process step, thereby achieving the advantage of simplifying the process steps.

Fig. 4 is a schematic sectional view along the broken line AB in fig. 3. As shown in fig. 4, the jumper wire 300 partially overlaps the battery cell array 10 in a direction Z perpendicular to a plane of the battery cell array, and an insulating layer 400 is disposed between the jumper wire 300 and the battery cell array 10 at least in an overlapping region.

It should be noted that the jumper 300 is generally a conductor formed by a conductive material, and when there is an overlap with the cell array 10, an interconnection bar (not shown) for achieving electrical connection between the cells is easy to overlap with the jumper 300, and if the two are in direct contact with each other, the electrical connection may be caused, thereby affecting the normal operation of the photovoltaic module. Therefore, an insulation layer 400 is disposed between the jumper line 300 and the battery cell array 10, and the insulation layer 400 is disposed at least in an overlapping region of the jumper line 300 and the interconnection bar (not shown) to ensure insulation. It is understood that, for the convenience of preparation, the insulating layer 400 may also be disposed in the surrounding area at the same time, as shown in fig. 4, which is not particularly limited in this embodiment, as long as the normal operation of the photovoltaic module is not affected.

Illustratively, the insulating layer 400 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.

Illustratively, with continued reference to fig. 4, the difference between the width of the insulating layer 400 and the width of the jumper 300 is greater than or equal to 5mm in the row direction X of the cell matrix 10.

Referring to fig. 3, the length of the insulating layer 400 is greater than the length of the cell matrix and less than the distance between the first connection point O and the second connection point P in the column direction Y of the cell matrix.

It should be noted that, in order to avoid the deviation between the actual position and the preset position of the jumper 300 and the insulating layer 400 caused by the process error, and the misalignment between the actual position and the preset position, the width of the insulating layer 400 is set to be greater than the width of the jumper 300, and the width of the insulating layer 400 is set to be at least twice the displacement length of the process error greater than the width of the jumper 300, for example, the difference between the width of the insulating layer 400 and the width of the jumper 300 is set to be equal to or equal to 5mm according to the conventional process error.

Similarly, the length of the insulating layer 400 is set to be greater than the length of the battery cell array, and in order to prevent the insulating layer 400 from affecting the electrical connection between the jumper 300 and the first connection point O and the second connection point P, the length of the insulating layer 400 is set to be smaller than the length between the first connection point O and the second connection point P.

Further, the thinner the insulating layer 400 is, the better the insulating function can be achieved, so that the lamination crack can be avoided.

Illustratively, adjacent cells 201 in the cell string are electrically connected by an interconnection bar (not shown), and the jumper wire 300 does not overlap with the interconnection bar (not shown) in a direction perpendicular to a plane in which the cell array is located.

It should be noted that the formed interconnection bar (not shown) has a certain height, which is raised above the surface of the cell array, and in order to avoid the problem that the lamination of the jumper wire 300, the insulation layer 400 and the interconnection bar (not shown) increases the local height further, and thus the lamination crack occurs, the jumper wire 300 is not overlapped with the interconnection bar (not shown).

Optionally, fig. 5 is a schematic cross-sectional structure diagram of a jumper wire provided in an embodiment of the present invention. Such as

As shown in fig. 5, the patch cord 300 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 300 with this 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 process of the photovoltaic module.

Illustratively, the thickness of the jumper 300 can range from 0.05 mm to 0.15mm, and the width of the jumper 300 can range from 1 mm to 5 mm.

It should be noted that the excessive thickness of the jumper 300 may affect the overall thickness of the photovoltaic module, the too small thickness of the jumper 300 may affect the electrical performance thereof, in addition, the too wide width of the jumper 300 may cause the occupied space to be large, thereby increasing the probability of the electrical connection between the jumper 300 and the cell matrix, and the too small width of the jumper 300 may affect the electrical performance connection characteristics between the jumper 300 and the first connection point and the second connection point, accordingly, the thickness range of the jumper 300 set in the preferred embodiment is 0.05-0.15 mm, and the width range of the jumper 300 is 1-5 mm.

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. 6 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. 6, 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 one battery cell group; the battery cell group comprises a first battery cell and a second battery cell which are connected in parallel; the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series; the first battery string and the second battery string both comprise a plurality of battery pieces which are connected in series and equal in number, wherein the battery pieces are half battery pieces formed by cutting whole battery pieces.

Specifically, each battery piece is placed at a preset position on a transparent protective substrate, the battery pieces belonging to the same battery string are electrically connected by using an interconnection bar according to a preset connection relationship, and then series connection between the corresponding battery strings, parallel connection between the corresponding battery units and series connection between the corresponding battery unit groups are realized by using a bus bar.

Step 12, forming at least one jumper wire, wherein the jumper wire is electrically connected with a first connecting point of two first battery strings connected in series in the battery cell group and a second connecting point of two second battery strings connected in series; the jumper includes a first subsection and a second subsection interconnected.

And step 13, electrically connecting a plurality of diodes with the main circuit and the jumper wire, wherein each diode is connected with one first battery string and one second battery string which have common endpoints in an inverse parallel mode through different sub-parts of the jumper wire.

For example, electrically connecting the plurality of diodes with the main circuit and the jumper may include: arranging two diodes corresponding to each battery cell group in the same junction box, then connecting each junction box with a main circuit, and connecting each diode with a first battery string group and a second battery string group which have common endpoints in reverse parallel through different sub-parts of corresponding jumper wires respectively after connection; or all the diodes are arranged in the same junction box, then the junction box is connected with the main circuit, and after the connection, each diode is connected with any first battery string group and any second battery string group with the common end points in reverse parallel through different sub-parts of the corresponding jumper wires.

According to the technical scheme provided by the embodiment, the main circuit is formed, and the jumper wire which is connected with each first connection point and the corresponding second connection point in the main circuit is formed, wherein the jumper wire comprises the first sub-part and the second sub-part which are connected with each other, different sub-parts of the jumper wire are the first battery string and the second battery string which have common endpoints randomly and are reversely connected with the same diode in parallel, so that the diode is only connected with one first battery string and one second battery string in parallel, compared with a mode that each diode is connected with two first battery strings and two second battery strings in parallel in the prior art, the number of the battery strings connected with the diode in parallel is reduced, on the premise that the diode is not broken down, the number of the battery pieces in each battery string is increased, and the problem that the diode is easily broken down in reverse when the number of the battery pieces in the photovoltaic module is increased is avoided.

It is to be noted that in the preparation method of the photovoltaic module provided in this embodiment, the structure of the main circuit is the same as the corresponding main circuit structure in the prior art, and a mature main circuit structure can be used without redesigning, thereby achieving the beneficial effect of simplifying the design. In addition, on the basis of the main circuit structure, the design that every two batteries which are connected in parallel and have a common end point are connected with the same diode in series-reverse parallel can be realized only by connecting one jumper, the structure is simple, and the process is easy to realize.

For example, forming the primary circuit of the photovoltaic module may include:

arranging all the battery pieces into N rows and M columns, adopting an interconnection bar to serially connect N/2 battery pieces which are positioned in the 1 st row to the N/2 nd row in each battery piece column as a first battery string, and adopting an interconnection bar to serially connect N/2 battery pieces which are positioned in the N/2+1 th row to the N th row in each battery piece column as a second battery string, wherein N is an even number.

Forming a central bus bar in a gap between an Nth/2 row and an Nth/2 +1 th row, wherein the extending direction of the central bus bar is the same as that of the cell rows, the central bus bar forms a partition area between an nth column and an N +1 th column, N is 2p +1, p is a non-negative integer, and N is less than M; and M/2 edge connecting bus bars are respectively formed on two opposite sides of the battery piece array along the extension direction of the battery piece array, and each edge bus bar corresponds to one first battery unit or one second battery unit.

The end parts, close to the central bus bar, of the central bus bar and the battery strings are connected through the interconnection bars, the end parts, far away from the central bus bar, of the bus bars and the battery strings are connected through the interconnection bars at the connection edges, so that one ends, far away from the central bus bar, of the two first battery strings respectively located on the nth row and the (n + 1) th row are connected in series through the edge connection bus bars, one ends, far away from the central bus bar, of the two second battery strings respectively located on the nth row and the (n + 1) th row are connected in series through the edge connection bus bars, and the first battery units and the second battery units are arranged in parallel along the extension direction of the battery piece rows.

On this basis, electrically connecting the plurality of diodes with the main circuit and the jumper may include: and the connection point of the first sub-part and the second sub-part of the jumper is electrically connected with an L-shaped outgoing line, the first edge of the L-shaped outgoing line is attached and connected with the jumper, and the second edge of the L-shaped outgoing line is vertical to the plane of the battery piece array. And a diode is electrically connected between the end points of the two central bus bars formed by the partition region and the second side of the L-shaped lead-out wire.

Optionally, in a direction perpendicular to a plane of the battery sheet array, the jumper partially overlaps with the battery sheet array, and before forming the at least one jumper, the method may further include: and forming an insulating layer on the battery piece array, wherein the insulating layer is at least formed in an overlapping area of the jumper wire and the battery piece array.

Or, the jumper includes a central conductor and a peripheral insulating layer wrapping the outside of the central conductor, and before forming at least one jumper, the jumper further includes: and a peripheral insulating layer is wrapped outside the central lead to form a jumper.

It should be noted that, in this embodiment, only the insulating layer is disposed between the jumper and the battery sheet matrix, and the structure of the jumper is set as the peripheral insulating layer wrapped outside the central conductor, which is used as an example to describe a manner of insulating the jumper from the battery sheet array, and any manner capable of insulating the jumper from the battery sheet matrix is within the protection scope of this embodiment.

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 one cell stack, characterized in that the cell stack comprises a first cell and a second cell connected in parallel;

2. The photovoltaic module according to claim 1, wherein the number of the at least one cell group is three, and the adjacent cell groups are connected in series.

3. The photovoltaic module of claim 1, wherein the number of the cells in the first and second strings of cells is greater than or equal to 12.

4. The assembly according to claim 1, wherein all the cells in the assembly are arranged in N rows and M columns, the extending direction of the cell rows is a first direction, the extending direction of the cell columns is a second direction, and the jumper extends along the second direction, wherein N and M are even numbers.

5. The photovoltaic module according to claim 4, wherein N/2 of the cells in the 1 st row to the N/2 nd row in each of the cell columns are sequentially connected in series to form the first cell string, and N/2 of the cells in the N/2+1 st row to the N nd row are sequentially connected in series to form the second cell string; two first battery strings respectively positioned in the nth column and the (n + 1) th column are connected in series to form the first battery unit, and two second battery strings respectively positioned in the nth column and the (n + 1) th column are connected in series to form the second battery unit, wherein n is 2p +1, p is a non-negative integer, and n is smaller than M;

the first battery cell and the second battery cell arranged in the second direction are connected in parallel as the battery cell group.

6. The photovoltaic module of claim 5, further comprising a center bus bar extending along the first direction, the center bus bar being disposed in a gap between the row N/2 and the row N/2+1 cell pieces; the first battery cell and the second battery cell aligned in the second direction are connected in parallel to the center bus bar.

7. The assembly according to claim 6, wherein said central bus bar comprises M/2 blocking regions between two of said common end points of said group of cells, one of said diodes being electrically connected between each of said end points of two central bus bars formed by said blocking regions and said jumper.

8. The photovoltaic module according to claim 7, wherein a connection point of the first sub-portion and the second sub-portion of the jumper is electrically connected with an L-shaped outgoing line, a first edge of the L-shaped outgoing line is attached to the jumper, and a second edge of the L-shaped outgoing line is perpendicular to a plane of the cell array;

the L-shaped outgoing lines correspond to the partition areas one by one, and one diode is electrically connected between the end points of the two central bus bars formed by the partition areas and the second edge corresponding to the L-shaped outgoing lines.

9. The photovoltaic module of claim 6, further comprising M edge-connecting bus bars; the ends, far away from the central bus bar, of the two first battery strings respectively positioned in the nth row and the (n + 1) th row are connected in series through the edge connecting bus bar, and the ends, far away from the central bus bar, of the two second battery strings respectively positioned in the nth row and the (n + 1) th row are connected in series through the edge connecting bus bar.

10. The photovoltaic module according to claim 4, wherein the jumper wire partially overlaps the cell array in a direction perpendicular to a plane of the cell array, and an insulating layer is disposed between the jumper wire and the cell array in at least an overlapping region.

11. The photovoltaic module of claim 10, wherein the insulating layer is a reflective film.

12. The photovoltaic assembly of claim 10, wherein a difference between a width of the insulating layer and a width of the jumper in the first direction is greater than or equal to 5 mm.

13. The photovoltaic module of claim 10, wherein the insulating layer has a length along the second direction that is greater than a length of the array of cells and less than a distance between the first connection point and the second connection point.

14. The photovoltaic module of claim 10, wherein adjacent ones of the cells in the string are electrically connected by an interconnect strip; in the vertical direction of the plane of the battery piece array, the jumper wire is not overlapped with the interconnection strip.

15. The photovoltaic module of claim 1, wherein the jumper includes a center conductor and a peripheral insulation layer wrapped around an outside of the center conductor.