CN215646721U

CN215646721U - Photovoltaic module

Info

Publication number: CN215646721U
Application number: CN202121455504.4U
Authority: CN
Inventors: 丁佳伟; 刘振阳; 焦方凯; 吕俊
Original assignee: Taizhou Longi Solar Technology Co Ltd
Current assignee: Taizhou Longi Solar Technology Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-01-25
Anticipated expiration: 2031-06-29
Also published as: WO2023273648A1

Abstract

The utility model discloses a photovoltaic module, relates to the technical field of photovoltaics, and aims to solve the problem that the generation efficiency of the photovoltaic module is influenced by increasing the invalid area of the photovoltaic module through a jumper wire. The cell string group of the photovoltaic module comprises a plurality of columns of cell strings which are electrically connected, at least one column of cell strings is connected with the bypass diode in parallel through a jumper wire, and at least part of the jumper wire is positioned on the back of the cell string group; the jumper comprises a stacked insulating layer and a stacked conducting layer, the insulating layer is in contact with the back face of the battery string group, and at least one column of battery strings are electrically connected with the bypass diode through the conducting layer. The photovoltaic module provided by the utility model is used for manufacturing the photovoltaic module.

Description

Photovoltaic module

Technical Field

The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic module.

Background

In order to prevent the hot spot effect caused by shielding of the solar cell, a bypass diode can be connected in parallel with the positive and negative electrode ports of the photovoltaic module. For the photovoltaic module with odd-numbered cell strings, a jumper wire needs to be designed between two adjacent cell strings or between a cell string and the edge of the photovoltaic module so as to connect the bypass diode and the cell string in parallel.

The area of the photovoltaic module can be increased due to the arrangement mode of the jumper, and the area increased by the jumper has no power generation function and is an invalid area, so that the power generation efficiency of the photovoltaic module is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a photovoltaic module, which aims to solve the problem that the generating efficiency of the photovoltaic module is influenced by increasing the invalid area of the photovoltaic module through a jumper wire.

In a first aspect, the present invention provides a photovoltaic module. The cell string group of the photovoltaic module comprises a plurality of columns of cell strings which are electrically connected, at least one column of cell strings is connected with the bypass diode in parallel through a jumper wire, and at least part of the jumper wire is positioned on the back of the cell string group; the jumper comprises a stacked insulating layer and a stacked conducting layer, the insulating layer is in contact with the back face of the battery string group, and at least one column of battery strings are electrically connected with the bypass diode through the conducting layer.

When the technical scheme is adopted, at least part of the jumper wire of the photovoltaic module is positioned on the back surface of the battery string group. At this time, the jumper may be at least partially hidden at the back of the battery string group. On the one hand, no jumper wire is arranged between the battery strings, so that the invalid area of the photovoltaic module cannot be increased due to the jumper wire, and the generating efficiency of the photovoltaic module can be ensured. On the other hand, the jumper wire is hidden, so that the glare problem caused by the jumper wire can be reduced, and the overall attractiveness of the photovoltaic module is improved.

In addition, the jumper wire positioned on the back face of the battery string group comprises a stacked insulating layer and a stacked conducting layer, the insulating layer is in contact with the back face of the battery string group, and at least one column of battery strings are electrically connected with the bypass diode through the conducting layer. At the moment, the conducting layer is connected with the battery string and the bypass diode, and the electric connection function of the jumper is realized. The insulating layer can be convenient with the insulating setting of wire jumper at the back of battery cluster group, can avoid the electric leakage problem. Therefore, the jumper can realize the functions of conductive connection and insulation setting. Compared with the prior art that the bus bar is used as the jumper wire, the jumper wire has the insulating function, insulating materials do not need to be laid on the back of the battery string group, the process steps can be reduced, the manufacturing flow of the photovoltaic module is simplified, and the manufacturing efficiency of the photovoltaic module is improved. And secondly, the insulating layer and the conducting layer of the jumper wire are combined together in advance, so that the stability is good, and the problem of deviation of the insulating layer and the conducting layer is not required to be considered, thereby improving the stability of the photovoltaic module. Finally, the jumper wire has a two-layer structure of the insulating layer and the conducting layer, and is simple in structure and small in thickness. On the one hand, the jumper wire with the simple structure is low in manufacturing difficulty and low in manufacturing cost. On the other hand, the jumper wire is small in thickness, the acting force on the battery piece is small, and the risk that the battery piece is hidden to crack due to the jumper wire can be reduced. In conclusion, the photovoltaic module provided by the utility model can conveniently and stably arrange the jumper wire on the back of the photovoltaic module with lower cost while hiding the jumper wire and ensuring the power generation efficiency.

In some implementations, the patch cord further includes a plurality of welds, the insulation layer having a plurality of openings, each weld being located in a respective opening; the conductive layer is electrically connected with the bus bar of the battery string through the welding part, and the conductive layer is electrically connected with the bus bar of the bypass diode through the welding part. The bus bars of the cell strings and the bypass diodes are located above the jumper wires, namely, the bus bars, the insulating layers and the conducting layers are sequentially arranged in the thickness direction of the photovoltaic module, and the bus bars are located on one side of the insulating layers of the jumper wires. The welding part is embedded in the insulating layer and is positioned between the bus bar and the conducting layer of the jumper. At the moment, the welding part can be conveniently and electrically connected with the conducting layer and the bus bar, and the jumper and the bus bar are not required to be bent too much, so that the probability of breakage of the jumper and the bus bar can be reduced, and the stability of the electrical performance of the photovoltaic module is improved.

In some implementations, the solder portion is plated on a portion of the conductive layer exposed in the opening, and a material of the solder portion includes at least one of tin, lead, or silver. The welding part of the material is plated on the conductive layer, and on one hand, the plating process such as electroplating or chemical plating is atomic-level combination, so that the welding part and the conductive layer can be ensured to have better combination strength. On the other hand, the tin-lead alloy and other materials have better welding performance, and can ensure that the welding part can be stably welded with the bus bar.

In some implementations, the conductive layer is bonded to the bus bars of the battery strings by a conductive adhesive, and the conductive layer is bonded to the bus bars of the bypass diodes by a conductive adhesive. At this time, the conducting layer can be contacted with the surface of the bus bar by bending the jumper wire or the bus bar, and the conducting layer is electrically connected by the conducting adhesive. Under the condition, although the jumper or the bus bar needs to be bent, the structure of the jumper does not need to be changed, the process difficulty is low, the operation is simple, and the connection between the conducting layer and the bus bar can be conveniently and quickly realized.

In some implementations, the jumper further includes a welding layer, the conductive layer is located between the insulating layer and the welding layer, the conductive layer is electrically connected to the bus bar of the battery string through the welding layer, and the conductive layer is electrically connected to the bus bar of the bypass diode through the welding layer; wherein the material of the soldering layer comprises at least one of tin, lead or silver. At this time, the contact of the welding layer with the bus bar can be achieved by bending the jumper wire or the bus bar. When the conducting layer is electrically connected with the bus bar through the welding layer, the welding layer made of the tin-lead alloy has good welding performance, so that the conducting layer and the bus bar can be stably welded together, and the electrical performance of the photovoltaic module is improved.

In some implementations, the width of the jumper is 3mm to 100 mm. At the moment, under the condition that the cross section area of the jumper wire is certain, the thickness of the jumper wire can be as small as possible, so that the risk of fracturing the battery piece by the jumper wire can be reduced. Moreover, the jumper and the bus bar can be ensured to have larger contact area, and the electrical contact performance of the jumper and the bus bar is improved.

In some implementations, the insulating layer has a thickness of 0.01mm to 0.2mm, and/or the conductive layer has a thickness of 0.01mm to 0.2 mm. At the moment, the thicknesses of the insulating layer and the conducting layer are smaller, so that overlarge acting force can be prevented from being applied to the battery piece in the laminating process, and the probability of hidden cracking of the battery piece is reduced. And moreover, the thickness of the photovoltaic module increased by jumper wires can be reduced by the aid of the smaller thickness.

In some implementations, the material of the insulating layer is polyimide, polyvinylidene fluoride. The insulating layer of the material not only has better insulating property, but also has better plasticity, and can be easily combined with the conducting layer. The material of the conductive layer is copper or silver. The color of the insulating layer is the same as the color of the back sheet of the photovoltaic module. At the moment, the colors of the photovoltaic modules can be consistent, and the attractiveness of the photovoltaic modules can be improved while glare is avoided.

In some implementations, the insulating layer and the conductive layer are laminated together, or the insulating layer and the conductive layer are bonded together. No matter the pressfitting is bonded, stable connection between the insulating layer and the conducting layer can be achieved, and therefore the conducting layer can be prevented from deviating from the insulating layer in the manufacturing process of the photovoltaic module, and working efficiency is improved.

In some implementations, the jumper wire covers a gap between two adjacent battery strings, or the jumper wire is located on the back of the battery strings. When the jumper wire is positioned on the back of the battery string, the acting force of the jumper wire on the battery pieces included in the battery string is uniform, so that the probability of hidden breakage of the battery pieces caused by the jumper wire can be reduced.

In some implementations, the number of battery strings is an odd number of columns. At this time, the jumper may be one or more, so that one or more columns of the battery strings are connected in parallel with the bypass diode through the jumper.

In some implementations, the number of battery strings is an even number of columns. At the moment, the jumper wires are utilized, the bypass diodes can be flexibly connected in series and in parallel for each row of batteries, and therefore the flexibility of the circuit design of the photovoltaic module can be improved.

In some implementations, the number of the battery strings is an odd number of columns, wherein one column of the battery strings is connected in parallel with the bypass diode through a jumper wire. At the moment, the circuit design that two rows of batteries are connected in series and in parallel with one bypass diode can be conveniently realized, and the design difficulty of odd-numbered rows of batteries is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

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

fig. 2 is a schematic front structural view of a photovoltaic module according to an embodiment of the present invention;

fig. 3 is a schematic back-side structure view of a photovoltaic module according to an embodiment of the present invention;

fig. 4 is a schematic front view of a first structure of a jumper according to an embodiment of the utility model;

FIG. 5 is a schematic diagram illustrating a side view of a first structure of a jumper according to an embodiment of the utility model;

FIG. 6 is a schematic diagram illustrating a front view of a first configuration of a patch cord according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a state where a jumper wire and a bus bar are connected according to a first structure provided in an embodiment of the present invention;

FIG. 8 is a schematic diagram illustrating a side view of a second configuration of a patch cord according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a state where a jumper wire and a bus bar are connected according to a second structure provided in the embodiment of the utility model;

FIG. 10 is a schematic diagram illustrating a front view of a third structure of a patch cord according to an embodiment of the present invention;

FIG. 11 is a schematic side view of a third configuration of a patch cord according to an embodiment of the present invention;

FIG. 12 is a schematic diagram illustrating a front view of a third configuration of a patch cord according to an embodiment of the present invention;

fig. 13 is a schematic diagram illustrating a state where a jumper wire and a bus bar are connected according to a third structure provided in the embodiment of the present invention.

In fig. 1, 10-photovoltaic module, 11-cell string, 12-bus bar.

In fig. 2-13, 20-photovoltaic module, 21-cell string, 210-cell sheet, 22-jumper, 221-insulating layer, 222-conductive layer, 223-solder, 224-solder layer, 23-bus bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the various schematic drawings of embodiments of the utility model are illustrated in the accompanying drawings and are not drawn to scale. Wherein certain details are exaggerated and possibly omitted for clarity of understanding. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.

It will be understood that when an element is referred to as being "fixed" or "disposed" to another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In a conventional photovoltaic module, even-numbered rows of cell strings are often used in the photovoltaic module based on circuit design, mass productivity, appearance and other considerations. And the battery string was 6 strings with an aspect ratio of substantially 2: 1. In the prior art, in order to obtain specific power output or solve the problems that operation is difficult, most production equipment cannot be compatible in the production process, wider photovoltaic modules cannot be stacked and placed in a container, and the installation difficulty is high when the width of the photovoltaic modules is larger, the photovoltaic modules use odd-number-row battery strings.

For the photovoltaic modules of the odd-numbered rows of the cell strings, a bus bar is usually used for replacing one cell string to manufacture a circuit structure similar to the even-numbered rows of the cell strings, so that inconvenience caused in the design and production processes of the photovoltaic modules of the odd-numbered rows of the cell strings is avoided. As shown in fig. 1, the photovoltaic module 10 has 5 columns of cell strings 11 and 1 bus bar 12 between the cell strings 11, forming a circuit structure like the 6 columns of cell strings 11. This bus bar 12 bypasses the diodes (not shown) in parallel with the one column of the cell strings 11. However, in the prior art, the bus bars 12 between the cell strings 11 increase the dead area of the photovoltaic module 10, affect the power generation efficiency, and cause glare and aesthetic problems.

In order to solve the above technical problem, an embodiment of the present invention provides a photovoltaic module 20. As shown in fig. 2 and 3, the cell string set of the photovoltaic module 20 includes a plurality of columns of electrically connected cell strings 21, at least one column of cell strings 21 is connected in parallel with the bypass diode through a jumper 22, and the jumper 22 is at least partially located on the back of the cell string set; the jumper 22 includes a stacked insulating layer 221 and a conductive layer 222, the insulating layer 221 is in contact with the back surface of the cell string group, and at least one column of cell strings 21 is electrically connected to the bypass diode through the conductive layer 222. The cell string group is a power generation unit formed by electrically connecting cell strings 21 included in the photovoltaic module 20. The jumper wire 22 may be partially located on the back surface of the battery string, or may be entirely located on the back surface of the battery string.

Based on the above structure, the jumper wire 22 of the photovoltaic module 20 is at least partially located on the back of the cell string. At this time, the jumper 22 may be at least partially hidden at the back of the battery string. On one hand, no jumper 22 is arranged between the cell strings 21, so that the photovoltaic module 20 does not increase the invalid area due to the jumper 22, and the power generation efficiency of the photovoltaic module 20 can be ensured. On the other hand, hiding the jumper 22 can reduce the glare problem caused by the jumper 22 and improve the overall aesthetic property of the photovoltaic module 20. In addition, the jumper wire 22 located at the back of the battery string group includes an insulating layer 221 and a conductive layer 222 which are laminated, the insulating layer 221 is in contact with the back of the battery string group, and at least one column of the battery strings 21 is electrically connected to the bypass diode through the conductive layer 222. At this time, the conductive layer 222 connects the battery string 21 and the bypass diode, and realizes the electrical connection function of the jumper wire 22. The insulating layer 221 can conveniently insulate the jumper 22 on the back of the battery string group, so that the problem of electric leakage can be avoided. It can be seen that the jumper 22 can perform both the conductive connection function and the insulation setting function. Compared with the prior art that the bus bar is used as the jumper wire 22, firstly, the jumper wire 22 provided by the embodiment of the utility model has an insulation function, and an insulation material does not need to be laid on the back of the battery string group, so that the process steps can be reduced, the manufacturing flow of the photovoltaic module 20 is simplified, and the manufacturing efficiency of the photovoltaic module 20 is improved. Secondly, the insulating layer 221 and the conductive layer 222 of the jumper 22 according to the embodiment of the utility model are combined together in advance, so that the stability is good, and the problem of deviation between the insulating layer 221 and the conductive layer 222 is not required to be considered, thereby improving the stability of the photovoltaic module 20. Finally, the jumper 22 of the embodiment of the utility model has a two-layer structure of the insulating layer 221 and the conducting layer 222, and has a simple structure and a small thickness. On one hand, the jumper wire 22 with a simple structure is low in manufacturing difficulty and low in manufacturing cost. On the other hand, the jumper wire 22 has a small thickness and a small acting force on the battery piece 210, so that the risk of hidden cracks of the battery piece 210 caused by the jumper wire 22 can be reduced. In summary, the photovoltaic module 20 according to the embodiment of the utility model hides the jumper 22, so as to ensure the power generation efficiency, and meanwhile, the jumper 22 can be conveniently and stably arranged on the back of the photovoltaic module 20 at a low cost.

The cell string in the photovoltaic module 20 may have various typesetting modes. Structurally, as shown in fig. 2 and 3, the battery string assembly may be divided into an upper portion and a lower portion. Of course, the photovoltaic module 20 may not be divided into upper and lower portions.

The number of the battery strings 21 may be an odd number of rows in terms of the number of the battery strings 21. At this time, the jumper 22 may be one or more, so that one or more columns of the battery strings 21 are connected in parallel with the bypass diode through the jumper 22. In practical application, the structure of the battery string set may be: the number of the battery strings 21 is an odd number of columns, wherein the battery strings 21 of one column are connected in parallel with the bypass diode through the jumper 22. At this time, the circuit design that two rows of battery strings 21 are connected in parallel with one bypass diode can be conveniently realized, and the design difficulty of odd-numbered battery strings 21 is reduced. As shown in fig. 2 and 3, the photovoltaic module 20 includes 5 columns of cell strings 21 and a jumper 22, a bypass diode is connected in parallel to the first and second columns of cell strings 21, a bypass diode is connected in parallel to the third column of cell strings 21 and the jumper 22, and a bypass diode is connected in parallel to the fourth and fifth columns of cell strings 21.

The number of the battery strings 21 may be even-numbered rows. At this time, by using the jumper 22, the bypass diode can be flexibly connected in parallel to each column of the cell string 21, so that the flexibility of the circuit design of the photovoltaic module 20 can be improved. For example, the photovoltaic module 20 includes 6 columns of cell strings 21 and 6 jumper wires 22. Each column of battery strings 21 and one jumper wire 22 are connected in parallel with one bypass diode. At this time, each column of the battery string 21 may be provided with a bypass diode.

In terms of the size of the battery cells 210, the battery cells 210 included in the battery string 21 may be either full-cell or sliced battery cells. The sliced battery pieces may be 1/2 battery pieces, 1/3 battery pieces, 1/4 battery pieces, 1/6 battery pieces and the like. As shown in fig. 2 and 3, the cell sheet 210 used in the photovoltaic module 20 is an 1/2 cell sheet. In terms of the connection form of the battery string 21, the battery string 21 may be a solder ribbon connection or a shingled connection.

The at least one column of battery strings 21 is connected in parallel with the bypass diode through the jumper 22, which means that in the photovoltaic module 20, one column of battery strings 21 may be connected in parallel with the bypass diode through the jumper 22, or two or more columns of battery strings 21 may be connected in parallel with the bypass diode through the corresponding jumper 22. Accordingly, the number of the jumper wires 22 is one or more.

The jumper 22 is located on the back of the battery string. Specifically, the jumper wire 22 may cover a gap between two adjacent battery strings 21. The jumper 22 may also be located at the rear of the battery string 21. When the jumper 22 is located on the back of the battery string 21, the acting force of the jumper 22 on the battery piece 210 included in the battery string 21 is uniform, so that the probability that the jumper 22 causes the battery piece 210 to be hidden and cracked can be reduced. As shown in fig. 2 and 3, the jumper 22 covers the gap between the second and third columns of battery strings 21 and covers the edges of the second and third columns of battery strings 21.

The insulating layer 221 and the conductive layer 222 included in the jumper 22 may be pressed together. The insulating layer 221 and the conductive layer 222 may also be bonded together. In practical applications, the pressing may be a hot pressing. The high pressure and high temperature provided by the hot press can tightly bond the insulating layer 221 and the conductive layer 222 together. Bonding may use an adhesive to bond the insulating layer 221 and the conductive layer 222 together. No matter pressing or bonding, stable connection between the insulating layer 221 and the conducting layer 222 can be achieved, and therefore the conducting layer 222 can be prevented from deviating from the insulating layer 221 in the manufacturing process of the photovoltaic module 20, and working efficiency is improved.

The width of the jumper 22 may be 3mm to 100 mm. That is, the width of the insulating layer 221 and the conductive layer 222 may be 3mm to 100 mm. The orthogonal projection of the jumper wire 22 on the battery string group is a rectangle, and the width of the jumper wire 22 is the width of the rectangle. For example, the width of the jumper 22 may be 3mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, or the like. At this time, under the condition that the cross-sectional area of the jumper wire 22 is constant, the thickness of the jumper wire 22 can be as small as possible, so that the risk of the jumper wire 22 fracturing the cell piece 210 can be reduced. In addition, the jumper wire 22 and the bus bar 23 can be ensured to have a larger contact area, and the electrical contact performance of the jumper wire 22 and the bus bar 23 is improved.

The thickness of the insulating layer 221 may be 0.01mm to 0.2 mm. The thickness of the conductive layer 222 may be 0.01mm to 0.2 mm. The thickness direction of the insulating layer 221 and the conductive layer 222 coincides with the thickness direction of the photovoltaic module 20. For example, the thickness of the insulating layer 221 may be 0.01mm, 0.03mm, 0.05mm, 0.07mm, 0.08mm, 0.1mm, 0.15mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, or the like. The thickness of the conductive layer 222 may be 0.01mm, 0.02mm, 0.04mm, 0.06mm, 0.09mm, 0.1mm, 0.13mm, 0.15mm, 0.17mm, 0.18mm, 0.2mm, or the like. At this time, the thicknesses of the insulating layer 221 and the conductive layer 222 are both small, so that an excessive force can be prevented from being applied to the battery piece 210 in the lamination process, and the probability of subfissure of the battery piece 210 is reduced. And, the smaller thickness, the increased thickness of the photovoltaic module 20 due to the jumper 22 can be reduced.

The insulating layer 221 may be made of polyimide or polyvinylidene fluoride. The insulating layer 221 made of such a material has not only a good insulating property but also good moldability, and can be easily combined with the conductive layer 222. The color of the insulating layer 221 is the same as the color of the back sheet of the photovoltaic module 20. At this time, the colors of the photovoltaic modules 20 can be consistent, and the aesthetic property of the photovoltaic modules 20 can be improved while glare is avoided. The conductive layer 222 is made of copper or silver.

The battery string 21 is connected in parallel with the bypass diode by a jumper wire 22. In practical applications, the first end of the battery string 21 is electrically connected to the first end of the bypass diode through the bus bar 23, and the second end of the battery string 21 is electrically connected to the second end of the bypass diode through the jumper 22. The first and second ends of the battery string 21, one being a positive end and the other being a negative end.

Specifically, the insulating layer 221 of the jumper 22 mainly plays a role of electrical insulation, so that the jumper 22 is conveniently arranged on the back of the battery string. The conductive layer 222 of the jumper 22 is used to electrically connect the battery string 21 and the bypass diode. The conductive layer 222 is connected to the cell string 21 and the bypass diode in various ways.

Illustratively, jumper 22 may also include a plurality of welds 223, and insulation layer 221 has a plurality of openings, with each weld 223 located in a respective opening. The conductive layer 222 is electrically connected to the bus bar 23 of the battery string 21 by a soldering portion 223, and the conductive layer 222 is electrically connected to the bus bar 23 of the bypass diode by the soldering portion 223. The bus bar 23 of the battery string 21 refers to the bus bar 23 at the end of the battery string 21. The bypass diode bus bar 23 is a bus bar 23 connected to the bypass diode. It should be understood that, since the soldering part 223 is in electrical contact with the conductive layer 222, when the soldering part 223 is electrically connected with the battery string 21 and the bypass diode, the conductive layer 222 is electrically connected with the battery string 21 and the bypass diode. The position of the welding portion 223 is not particularly limited in the present invention as long as contact with the bus bar 23 can be achieved.

As shown in fig. 2 and 3, the third column of the battery string 21 is divided into an upper portion and a lower portion, and the jumper wire 22 needs to be connected to the battery string 21 of the upper portion and the lower portion and electrically connected to a bypass diode (not shown) located between the upper portion and the lower portion. As shown in fig. 4-6, insulation layer 221 has 3 openings and jumper 22 includes 3 welds 223. The jumper wire 22 includes a first welding part 223, a second welding part 223, and a third welding part 223, which are sequentially arranged, along the length direction of the jumper wire 22. As shown in fig. 7, the photovoltaic module 20 is placed with the front side facing upward, and when the jumper 22 is in contact with the bus bar 23, the bus bar 23 is pressed against the soldering portion 223. The first welding part 223 is electrically contacted with the bus bar 23 of the upper part battery string 21. And a third welding part 223 electrically contacting the bus bar 23 of the lower cell string 21. And a second soldering part 223 electrically contacting the bus bar 23 of the bypass diode located at the middle part.

In this connection manner using the soldering portion 223, the cell string 21 and the bus bar 23 of the bypass diode are both located above the jumper wire 22, that is, in the thickness direction of the photovoltaic module 20, the bus bar 23, the insulating layer 221 and the conductive layer 222 are sequentially arranged, and the bus bar 23 is located on the insulating layer 221 side of the jumper wire 22. And the soldering part 223 is embedded in the insulating layer 221 between the bus bar 23 and the conductive layer 222 of the jumper 22. At this time, the welding portion 223 can conveniently electrically connect the conductive layer 222 and the bus bar 23 without bending the jumper wire 22 and the bus bar 23 too much, so that the probability of breaking the jumper wire 22 and the bus bar 23 can be reduced, and the stability of the electrical performance of the photovoltaic module 20 can be improved.

The position and shape of the welding portion 223 are not particularly limited in the present invention, as long as contact with the bus bar 23 is achieved. The soldering portion 223 is plated on a portion of the conductive layer 222 exposed in the opening, and a material of the soldering portion 223 includes at least one of tin, lead, or silver. The soldering portion 223 of the material is plated on the conductive layer 222, and on one hand, the plating process such as electroplating or chemical plating is an atomic-scale chemical bonding, so that a good bonding strength between the soldering portion 223 and the conductive layer 222 can be ensured. On the other hand, the tin-lead alloy and other materials have good welding performance, and can ensure that the welding part 223 can be stably welded with the bus bar 23.

For example, the conductive layer 222 may be bonded to the bus bar 23 of the battery string 21 by a conductive adhesive, and the conductive layer 222 may be bonded to the bus bar 23 of the bypass diode by a conductive adhesive. At this time, the conductive layer 222 may be brought into contact with the surface of the bus bar 23 by bending the jumper wire 22 or the bus bar 23, and the electrical connection may be achieved by conductive adhesive bonding. In this case, although the jumper 22 or the bus bar 23 needs to be bent, the structure of the jumper 22 does not need to be changed, the process difficulty is low, the operation is simple, and the connection between the conductive layer 222 and the bus bar 23 can be conveniently and quickly realized. For the cell string structure shown in fig. 2 and 3. As shown in fig. 8 and 9, the photovoltaic module 20 is placed with the front side facing upward, and the conductive layer 222 is laminated on the bus bar 23 of the upper cell string 21, the bus bar 23 of the lower cell string 21, and the bus bar 23 of the middle bypass diode. The contact between the conductive layer 222 and the bus bar 23 is electrically bonded by a conductive adhesive.

For example, as shown in fig. 10 to 13, the jumper 22 may further include a soldering layer 224, the conductive layer 222 is located between the insulating layer 221 and the soldering layer 224, the conductive layer 222 is electrically connected to the bus bar 23 of the battery string 21 through the soldering layer 224, and the conductive layer 222 is electrically connected to the bus bar 23 of the bypass diode through the soldering layer 224; wherein the material of the soldering layer 224 includes at least one of tin, lead or silver. At this time, by bending the jumper wire 22 or the bus bar 23, the contact of the welding layer 224 with the bus bar 23 can be achieved. When the conductive layer 222 is electrically connected to the bus bar 23 through the soldering layer 224, since the soldering layer 224 of the tin-lead alloy has a better soldering performance, the conductive layer 222 and the bus bar 23 can be firmly soldered together, and the electrical performance of the photovoltaic module 20 is improved.

For the cell string structure shown in fig. 2 and 3. As shown in fig. 10-13, the photovoltaic module 20 is placed face up with the solder layer 224 overlying the bus bar 23 of the upper cell string 21, the bus bar 23 of the lower cell string 21, and the bus bar 23 of the middle bypass diode. Since the soldering layer 224 is in electrical contact with the conductive layer 222, when the soldering layer 224 is soldered to the bus bar 23, electrical connection of the conductive layer 222 to the bus bar 23 can be achieved.

The above description is only for the specific embodiment of the present invention or the description thereof, and the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A photovoltaic module is characterized in that a cell string group of the photovoltaic module comprises a plurality of columns of electrically connected cell strings, at least one column of the cell strings is connected with a bypass diode in parallel through a jumper wire, and the jumper wire is at least partially positioned on the back of the cell string group;

the jumper comprises an insulating layer and a conducting layer which are stacked, the insulating layer is in contact with the back face of the battery string group, and the at least one row of battery strings are electrically connected with the bypass diode through the conducting layer.

2. The photovoltaic assembly of claim 1, wherein the jumper further comprises a plurality of welds, the insulation layer having a plurality of openings, each weld being located in a respective opening;

the conductive layer is electrically connected to the bus bars of the battery string through the soldering part, and the conductive layer is electrically connected to the bus bars of the bypass diode through the soldering part.

3. The photovoltaic module of claim 2, wherein the solder portion is plated on a portion of the conductive layer exposed in the opening.

4. The photovoltaic module of claim 1, wherein the conductive layer is bonded to the busbars of the cell strings by a conductive adhesive, and the conductive layer is bonded to the busbars of the bypass diodes by a conductive adhesive.

5. The photovoltaic module of claim 1, wherein the jumper further comprises a solder layer, the conductive layer is between the insulating layer and the solder layer, the conductive layer is electrically connected to the bus bars of the cell string through the solder layer, and the conductive layer is electrically connected to the bus bars of the bypass diode through the solder layer.

6. The photovoltaic module according to any one of claims 1 to 5, wherein the width of the jumper is 3mm to 100 mm; and/or the thickness of the insulating layer is 0.01 mm-0.2 mm; and/or the thickness of the conducting layer is 0.01 mm-0.2 mm; and/or the insulating layer has the same color as the back sheet of the photovoltaic module; and/or the material of the conducting layer is copper or silver.

7. The photovoltaic module of any of claims 1 to 5, wherein the insulating layer and the conductive layer are laminated together or the insulating layer and the conductive layer are bonded together.

8. The photovoltaic module according to any one of claims 1 to 5, wherein the jumper wire covers a gap between two adjacent cell strings, or is positioned on the back of the cell strings.

9. The photovoltaic module according to any one of claims 1 to 5, wherein the number of the cell strings is an odd number of columns, or the number of the cell strings is an even number of columns.

10. The photovoltaic module according to any one of claims 1 to 5, wherein the number of the cell strings is an odd number of columns, and one column of the cell strings is connected in parallel with the bypass diode through a jumper wire.