CN210379082U

CN210379082U - Photovoltaic module

Info

Publication number: CN210379082U
Application number: CN201921553384.4U
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 battery cell group in the photovoltaic module, the first connecting points of the two first battery string groups and the second connecting points of the two second battery string groups are electrically connected through a jumper wire, the jumper wire comprises a first sub-part and a second sub-part which are mutually connected, and the first battery string group and the second battery string group which have common endpoints are respectively connected with the same diode in a reverse parallel mode through different sub-parts of the jumper wire. 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 cluster group, and then the problem of the diode that easily leads to when having avoided increasing photovoltaic module in battery piece quantity 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 string groups connected in series, each first battery string group comprises at least one first battery string, and when the number of the at least one first battery string is greater than or equal to 2, the first battery strings are connected in parallel;

the second battery unit comprises two second battery string groups connected in series, each second battery string group comprises at least one second battery string, and when the number of the at least one second battery string is greater than or equal to 2, the second battery strings are connected in parallel;

the battery strings in each battery string group comprise battery pieces which are equal in number and are connected in series;

in the same battery cell group, the first connection points of the two first battery string groups connected in series and the second connection points of the two second battery string groups connected in series are electrically connected 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 group and the second battery string group which have a common endpoint arbitrarily are reversely connected in parallel with the same diode through different sub-parts of the jumper wire.

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 stack comprising a first cell and a second cell connected in parallel; the first battery unit comprises two first battery string groups connected in series, each first battery string group comprises at least one first battery string, and when the number of the at least one first battery string is greater than or equal to 2, the first battery string groups are connected in parallel; the second battery unit comprises two second battery string groups connected in series, each second battery string group comprises at least one second battery string, and when the number of the at least one second battery string is greater than or equal to 2, the second battery strings are connected in parallel; the battery strings in each battery string group comprise battery pieces which are equal in number and are connected in series;

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

and electrically connecting a plurality of diodes with the main circuit and the jumper wire, wherein each diode is connected with any first battery string group and any second battery string group with a common endpoint in reverse parallel through different sub-parts corresponding to the jumper wire.

The embodiment of the utility model provides a technical scheme, a wire jumper is connected to the electricity between the first tie point of the first battery string group through two series connections in every battery cell group and the second tie point of the second battery string group of two series connections, wherein, the wire jumper includes interconnect's first sub-part and second sub-part to different sub-parts through the wire jumper are for having public endpoint wantonly first battery string group with the same diode of second battery string group reverse parallel connection for the diode is only parallelly connected with a first battery string group and a second battery string group, compare in prior art every diode and two first battery string groups and two parallelly connected modes of second battery string group, and the quantity of the parallelly connected battery string group of diode reduces, under the prerequisite of guaranteeing that the diode is not punctured, and the quantity of battery piece increases in every battery string group, and then has avoided increasing the problem that easily leads to the diode to be punctured backward when the battery piece quantity among the photovoltaic module and has gone out Now. 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 circuit diagram of another photovoltaic module provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of the photovoltaic module of FIG. 3;

FIG. 5 is a schematic cross-sectional view taken along the dashed line AB of FIG. 4;

fig. 6 is a schematic cross-sectional structure diagram of a jumper according to an embodiment of the present invention;

fig. 7 is a schematic flow chart of a manufacturing method of 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;

111-a first battery string;

121-a second battery string;

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;

10-a cell array;

301-center conductor;

302-a peripheral insulating layer;

a 500-L type outlet;

501-first side;

502-second edge.

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 embodiment of the utility model provides a technical scheme, a wire jumper is connected to the electricity between the first tie point of the first battery string group through two series connections in every battery cell group and the second tie point of the second battery string group of two series connections, wherein, the wire jumper includes interconnect's first sub-part and second sub-part to different sub-parts through the wire jumper are for having public endpoint wantonly first battery string group with the same diode of second battery string group reverse parallel connection for the diode is only parallelly connected with a first battery string group and a second battery string group, compare in prior art every diode and two first battery string groups and two parallelly connected modes of second battery string group, and the quantity of the parallelly connected battery string group of diode reduces, under the prerequisite of guaranteeing that the diode is not punctured, and the quantity of battery piece increases in every battery string group, and then has avoided increasing the problem that easily leads to the diode to be punctured backward when the battery piece quantity among the photovoltaic module and has gone out Now.

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. Fig. 3 is a schematic circuit diagram of another photovoltaic module according to an embodiment of the present invention. As shown in fig. 2 and 3, the photovoltaic module includes at least one cell group 100, the cell group 100 includes a first cell unit 110 and a second cell unit 120 connected in parallel, the first cell unit 110 includes two first cell string groups 111 connected in series, the first cell string group 111 includes at least one first cell string 101, when the number of the at least one first cell string 101 is greater than or equal to 2, the first cell string 101 is connected in parallel, the second cell unit 120 includes two second cell string groups 121 connected in series, the second cell string group 121 includes at least one second cell string 102, when the number of the at least one second cell string 102 is greater than or equal to 2, the second cell string 102 is connected in parallel, and the cell strings in the cell string groups each include an equal number of cell sheets 201 connected in series. In the same battery cell group 100, the first connection point O of the two first battery string groups 111 connected in series and the second connection point P of the two second battery string groups 121 connected in series are electrically connected through a jumper 300, the jumper 300 includes a first sub-part 310 and a second sub-part 320 connected to each other, and any first battery string group 111 and any second battery string group 121 having a common terminal are connected in reverse parallel to the same diode 200 through different sub-parts of the jumper 300, respectively.

The diode 200 can prevent a hot spot effect from being generated when the first battery string set 111 or the second battery string set 121 connected in parallel with the diode is blocked. Also, 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.

It should be noted that, the present embodiment is only described by taking the structures of fig. 2 and fig. 3 as an example, and is not limited thereto, and in other embodiments of the present embodiment, the photovoltaic module may also be another structure satisfying the above conditions.

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 technical solution provided in this embodiment, a jumper 300 is electrically connected between the first connection point O of two first battery string sets 111 connected in series and the second connection point P of two second battery string sets 121 connected in series in each battery cell group 100, wherein the jumper 300 includes a first sub-portion 310 and a second sub-portion 320 connected with each other, and the same diode 200 is reversely connected in parallel to any first battery string set 111 and any second battery string set 121 having a common end point through different sub-portions of the jumper 300, so that the diode 200 is connected in parallel to only one first battery string set 111 and one second battery string set 121, compared with the prior art in which each diode 200 is connected in parallel to two first battery string sets 111 and two second battery string sets 121, the number of battery string sets in parallel connection with the diode 200 is reduced, and on the premise that the diode 200 is not broken down, the number of the cells 201 in each cell string group is increased, so that the problem that the diode 200 is subjected to reverse breakdown easily caused by increasing the number of the cells 210 in the photovoltaic module is solved.

Further, with continued reference to fig. 3, the number of at least one cell stack 100 is greater than or equal to 2, with adjacent cell stacks 100 connected in series.

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.

Alternatively, the battery sheet 201 may be a half-or-third battery sheet cut from a whole battery sheet.

On this basis, as shown in fig. 2, the number of each of the at least one first battery string 101 and the at least one second battery string 102 may be 3. For example, with continued reference to fig. 2, the number of at least one cell stack 100 may be 1.

Alternatively, as shown in fig. 3, the number of the at least one first battery string 101 and the at least one second battery string 102 may each be 1. For example, with continued reference to fig. 3, the number of at least one cell stack 100 may be 3.

It should be noted that, by using the cut whole cell as the cell 201, the beneficial effect of reducing the internal resistance and energy consumption of the whole photovoltaic module can be achieved.

It should be further noted that the photovoltaic resistor structures shown in fig. 2 and fig. 3 both adopt 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.

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 total voltage of one battery string group connected in parallel, and because the same battery string group is connected in parallel, the total voltage of the battery string group is equal to the voltage of one battery string, that is, the reverse voltage of the diode is equal to the voltage of one battery string, at this time, the number of the battery pieces in each battery string may be 24 pieces at most, that is, compared with the scheme that the number of the battery pieces in the battery string in fig. 1 is 12 pieces at most, the number of the battery pieces in each battery string in the photovoltaic module provided in this embodiment may be increased by one time, and further, under the condition that the numbers of the battery strings are equal, the total number of the battery pieces in the photovoltaic module may. 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.

Alternatively, fig. 4 is a schematic structural diagram of the photovoltaic module of fig. 3. As shown in fig. 4, the cells 201 in the photovoltaic module are arranged in a matrix, and the jumper 300 extends along the column direction Y of the matrix. Fig. 5 is a schematic sectional view along the broken line AB in fig. 4. As shown in fig. 5, the jumper wire 300 partially overlaps the cell sheet matrix 10 in a direction Z perpendicular to a plane in which the cell sheet matrix 10 is located, and an insulating layer 400 is disposed between the jumper wire 300 and the cell sheet matrix 10 at least in the 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. 5, 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. 5, 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. 4, 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, with reference to fig. 4, a connection point of the first sub-portion 310 and the second sub-portion 320 of the jumper 300 is electrically connected to the L-shaped lead-out wire 500, a first side 501 of the L-shaped lead-out wire 500 is attached to the jumper 300, a second side 502 of the L-shaped lead-out wire 500 is perpendicular to a plane where the battery cell array is located, and any first battery string group 111 and any second battery string group 112 having a common terminal are connected in parallel to the same diode 200 in an opposite direction through the different sub-portions of the jumper 300 and the L-shaped lead-out wire 500, respectively.

It should be noted that the L-shaped outgoing line 500 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. In addition, the second side 502 of the L-shaped outgoing line 500 can be directly electrically connected with the diode 200 without additionally arranging a connecting wire, which is beneficial to simplifying the connection process.

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 500 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.

Optionally, fig. 6 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. 6, 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. 7 is a schematic flow chart of a manufacturing method of a photovoltaic module according to an embodiment of the present invention. As shown in fig. 7, the preparation method of the photovoltaic module specifically includes the following steps:

step 11, forming a main circuit of the photovoltaic module, wherein the main circuit comprises at least one battery cell group, and 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 string groups connected in series, each first battery string group comprises at least one first battery string, and when the number of the at least one first battery string is greater than or equal to 2, the first battery string groups are connected in parallel; the second battery unit comprises two second battery string groups which are connected in series, each second battery string group comprises at least one second battery string, and when the number of the at least one second battery string is greater than or equal to 2, the second battery strings are connected in parallel; the battery strings in the battery string group comprise battery slices which are equal in number and are connected in series.

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

And 12, forming at least one jumper wire, wherein the jumper wire is electrically connected with the first connecting point of two first battery string groups connected in series and the second connecting point of two second battery string groups connected in series in the battery cell group, and the jumper wire comprises a first sub-part and a second sub-part which are connected with each other.

For example, the cell sheets in the photovoltaic module may be arranged in a matrix, the jumper extends along a column direction of the matrix, and the jumper partially overlaps with the matrix along a direction perpendicular to a plane of the matrix, before forming at least one jumper, the method further includes: and forming an insulating layer on the matrix, wherein the insulating layer is at least formed in an overlapping area of the jumper wire and the matrix.

Or, optionally, the patch cord includes a central conductor and a peripheral insulation layer wrapped outside the central conductor, and before forming at least one patch cord, the patch cord 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.

And step 13, electrically connecting a plurality of diodes with the main circuit and the jumper wires, wherein 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.

Optionally, electrically connecting a plurality of diodes with the main circuit and the jumper, each diode being connected in inverse parallel with any of the first battery string set and the second battery string set having a common end point through different sub-sections of the jumper, includes: and a connecting point of each jumper wire is electrically connected with an L-shaped outgoing line, a first edge of the L-shaped outgoing line is connected with the jumper wire in a bonding way, a second edge of the L-shaped outgoing line is perpendicular to the plane where the cell matrix is located, a diode is connected between a common end point of any first cell string group and any second cell string group in the cell unit group and a corresponding second edge, and the first cell string group and the second cell string group with any common end point are respectively connected with the same diode in a reverse parallel mode through different sub-parts of the jumper wire and the L-shaped outgoing line.

It is to be noted that in the preparation method of the photovoltaic module provided by this embodiment, the structure of the main circuit is the same as that of the main circuit in the prior art, and a mature main circuit structure can be used without redesign, thereby achieving the beneficial effect of simplifying the design. In addition, on the basis of the main circuit structure, the design that no two batteries which are connected in parallel and have a common end point are connected in series and parallel with the same diode in the reverse direction can be realized only by connecting one jumper, the structure is simple, and the process is easy to realize.

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.

In the technical solution provided by this embodiment, by forming the main circuit and forming the jumper wire connecting each first connection point and the corresponding second connection point in the main circuit, wherein the jumper wire comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string group and the second battery string group which have a common endpoint are connected in parallel in an inverse manner by the same diode through different sub-parts of the jumper wire, the diodes are connected in parallel with only one first battery string group and one second battery string group, compared with the prior art in which each diode is connected in parallel with two first battery string groups and two second battery string groups, the number of the battery string groups connected in parallel with the diodes is reduced, on the premise of ensuring that the diode is not broken down, the number of the battery pieces in each battery string group 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.

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, characterized in that the number of said at least one cell group is greater than or equal to 2, said adjacent cell groups being connected in series.

3. The photovoltaic module according to claim 1 or 2, wherein the cell sheet is a half-or a third-cell sheet cut from a whole cell sheet.

4. The photovoltaic module according to claim 1 or 2, wherein the number of the at least one first cell string and the at least one second cell string is 1 string or 3 strings.

5. 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.

6. The assembly according to claim 1, wherein the cells in the assembly are arranged in a matrix, and the jumper extends along a column direction of the matrix.

7. The assembly according to claim 6, wherein the jumper partially overlaps the matrix in a direction perpendicular to a plane of the matrix, and an insulating layer is disposed between the jumper and the matrix in at least an overlapping region.

8. The photovoltaic module of claim 7, wherein the insulating layer is a reflective film.

9. The photovoltaic module of claim 7, wherein a difference between a width of the insulating layer and a width of the jumper is greater than or equal to 5mm in a row direction of the matrix.

10. The photovoltaic module of claim 7, wherein the length of the insulating layer is greater than the length of the matrix and less than the distance between the first and second connection points along the column direction of the matrix.

11. The photovoltaic module of claim 7, wherein adjacent ones of the cells in the string are electrically connected by an interconnect strip; in the vertical direction of the plane, the jumper wire and the interconnection strip are not overlapped.

12. The photovoltaic module according to claim 7, wherein a connection point of the first sub-portion and the second sub-portion is electrically connected to an L-shaped lead, a first side of the L-shaped lead is attached to the jumper wire, and a second side of the L-shaped lead is perpendicular to the plane;

the first battery string group and the second battery string group which have a common end point are reversely connected with the same diode in parallel through different sub-parts of the jumper wire and the L-shaped outgoing line respectively.

13. 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.

14. The photovoltaic module according to claim 1, wherein the thickness of the jumper is in a range of 0.05-0.15 mm, and the width of the jumper is in a range of 1-5 mm.