CN211828793U

CN211828793U - Photovoltaic module

Info

Publication number: CN211828793U
Application number: CN202020493920.2U
Authority: CN
Inventors: 毛剑宇; 董经兵; 潘秀娟
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: 2020-04-07
Filing date: 2020-04-07
Publication date: 2020-10-30
Anticipated expiration: 2030-04-07

Abstract

The utility model discloses a photovoltaic module, photovoltaic module includes: a battery string layer; the back plate is arranged below the battery string layer, one side of the back plate, which is far away from the battery string layer, is provided with at least one junction box, and the junction box shields at least one battery piece of at least one battery string; the reflector layer, the reflector layer is established between battery cluster layer and backplate, the reflector layer includes that two horizontal strips of reflection of light and a plurality of reflection of light indulge the strip, two horizontal strips of reflection of light arrange the interval in photovoltaic module's cluster and set up, every reflection of light indulges the edge that the strip covers adjacent battery cluster, at least one disconnection of the battery piece that the neighbouring battery piece that is sheltered from by the terminal box in the strip is indulged in a plurality of reflections of light is in order to form at least one opening, the opening is located the battery piece department that is sheltered from by the terminal box, so that the area of sheltering from of all battery pieces in. According to the utility model discloses a photovoltaic module makes the area of sheltering from of battery piece in same battery cluster equal, avoids producing the electric current mismatch, has improved photovoltaic module reliability.

Description

Photovoltaic module

Technical Field

The utility model belongs to the technical field of the photovoltaic technique and specifically relates to a photovoltaic module is related to.

Background

Along with the rapid growth of the market demand of the photovoltaic module, users are higher and higher for the photovoltaic module, and the photovoltaic module is required to meet the requirements of various fields and different installation environments while the photovoltaic module is ensured to have higher efficiency. Therefore, double-glass photovoltaic modules are produced at the same time. In the correlation technique, the problem of mismatch of battery piece current easily appears at the back of the double-glass photovoltaic assembly because the junction box shelters from the battery piece, thereby leading to the photovoltaic assembly's reliability lower.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a photovoltaic module, photovoltaic module can avoid appearing the electric current mismatch, has improved photovoltaic module's reliability.

According to the utility model discloses photovoltaic module, include: a battery string layer including a plurality of battery strings, each of the battery strings including a plurality of battery cells; the back plate is arranged below the battery string layer, one side of the back plate, which is far away from the battery string layer, is provided with at least one junction box, and the junction box shields at least one battery sheet of at least one battery string; the reflecting layer is arranged between the battery string layer and the back plate and comprises two reflecting transverse strips and a plurality of reflecting longitudinal strips, the two reflecting transverse strips are arranged on the string arrangement direction of the photovoltaic assembly at intervals, the plurality of reflecting longitudinal strips are connected between the two reflecting transverse strips at intervals along the string parallel direction perpendicular to the string arrangement direction, each reflecting longitudinal strip covers the edge of the adjacent battery string, at least one adjacent battery piece shielded by the junction box in the plurality of reflecting longitudinal strips is disconnected to form at least one opening, and the opening is positioned at the battery piece shielded by the junction box, so that the shielding areas of all the battery pieces in the battery string shielded by the junction box are equal.

According to the utility model discloses photovoltaic module, through setting up battery cluster layer, the backplate with indulge the reflector layer of strip including two reflection of light horizontal stripes and a plurality of reflection of light, and make every reflection of light indulge the strip and cover the edge of adjacent battery cluster and a plurality of reflection of light indulge at least one disconnection of the battery piece that the neighbouring was sheltered from by the terminal box in the strip in order to form at least one opening, the opening part can avoid sheltering from the battery piece, thereby make the area of sheltering from of all battery pieces in the battery cluster that is sheltered from by the terminal box equal, the current mismatch of battery piece has been avoided, the photovoltaic module reliability is improved, can effectively avoid the terminal box to shelter from the reliability risk that back battery piece brought.

According to the utility model discloses a some embodiments, the terminal box is with a plurality of one of them is relative in the strip is indulged in the reflection of light, and is a plurality of in the strip is indulged in the reflection of light be formed with on one of them the opening, the opening is for the line hole of crossing that link up, cross the line hole with the terminal box is just right.

According to some embodiments of the present invention, the plurality of longitudinal reflective strips includes a plurality of first reflective strips and a plurality of second reflective strips, and one first reflective strip is disposed between two adjacent second reflective strips; the terminal box is a plurality of, a plurality of the terminal box with a plurality of the first reflection of light strip one-to-one sets up, every the second reflection of light strip all has the opening.

According to some embodiments of the invention, each of the first light reflecting strips has the opening, and the length of the opening of the first light reflecting strip is smaller than the length of the opening of the second light reflecting strip.

According to some embodiments of the invention, the length of the opening is l, wherein l satisfies: l is more than 0mm and less than or equal to 500 mm.

According to the utility model discloses a some embodiments, every adjacent two in the battery string distance between the battery piece is d, wherein d satisfies: d is more than or equal to 0mm and less than or equal to 2 mm.

According to some embodiments of the present invention, each width of the reflective longitudinal strip is w, wherein w satisfies: w is more than or equal to 2mm and less than or equal to 15 mm.

According to some embodiments of the utility model, two the reflection of light horizontal bar with the cluster is side by side two of the top side in the direction the width that the strip was indulged in the reflection of light is greater than all the other the width that the strip was indulged in the reflection of light.

According to some embodiments of the present invention, the reflective layer is a reflective coating coated on a side surface of the back plate adjacent to the battery string layer.

According to some embodiments of the utility model, the backplate with be equipped with the encapsulation glued membrane between the battery cluster layer, the reflector layer is established on the encapsulation glued membrane.

According to some embodiments of the invention, the reflective layer passes through the adhesive with backplate adhesive joint.

According to some embodiments of the utility model, photovoltaic module is in the symmetrical structure of the string direction of arranging symmetry.

According to some embodiments of the utility model, every the length of the vertical strip of reflection of light is a in the direction of arranging, two apart from furthest of cluster maximum distance between the battery piece is b, wherein, a, b satisfy: a/b is more than or equal to 0.7 and less than or equal to 1.3.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a photovoltaic module according to an embodiment of the present invention;

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

fig. 3 is a schematic diagram of a junction box of a photovoltaic module according to an embodiment of the present invention.

Reference numerals:

100: a photovoltaic module;

1: a front transparent plate; 2: a battery string layer; 21: a battery string; 211: a battery piece;

3: a back plate; 31: a junction box; 4: a light-reflecting layer; 41: a light reflecting horizontal bar;

42: a light reflecting longitudinal strip; 421: a wire passing hole; 422: a first light-reflecting strip;

423: a second reflective strip; 43: an opening; 5: packaging a glue film on the front side; 6: and packaging the adhesive film.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

A photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1-3.

As shown in fig. 1, a photovoltaic module 100 according to an embodiment of the present invention includes a battery string layer 2, a back plate 3, and a reflective layer 4.

Specifically, the battery string layer 2 includes a plurality of battery strings 21, and each battery string 21 includes a plurality of battery sheets 211. In the description of the present invention, "a plurality" means two or more. For example, in the example of fig. 1 and 2, the battery string layer 2 may include six battery strings 21, and each battery string 21 may include a plurality of battery sheets 211 connected in series. Alternatively, the photovoltaic module 100 may include a front transparent plate 1, and the cell string layer 2 is disposed under the front transparent plate 1.

Six battery strings 21 are shown in fig. 1 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to other numbers of battery strings 21, which also falls within the protection scope of the present invention.

As shown in fig. 2 and 3, the back sheet 3 is provided below the battery string layer 2. At least one junction box 31 is arranged on one side of the back plate 3 far away from the battery string layer 2. The junction box 31 blocks at least one cell 211 of at least one cell string 21. In other words, the junction box 31 may shield at least one battery piece 211 in one battery string 21, or may shield at least one battery piece 211 in two adjacent battery strings 21 at the same time.

The reflective layer 4 is established between battery cluster layer 2 and backplate 3, and the reflective layer 4 includes two horizontal strips 41 of reflection of light and a plurality of reflection of light vertical strip 42, and two horizontal strips 41 of reflection of light set up at the cluster orientation interval of photovoltaic module 100, and a plurality of vertical strips 42 of reflection of light are connected between two horizontal strips 41 of reflection of light at an interval each other along the cluster parallel direction perpendicular to the cluster orientation of arranging, and every vertical strip 42 of reflection of light covers the edge of adjacent battery cluster 21.

Here, it should be noted that the "string arrangement direction" may be understood as an arrangement direction (for example, the up-down direction in fig. 2) of the plurality of battery pieces 211 in the battery string 21; the "string parallel direction" is a direction perpendicular to the "string arrangement direction".

For example, in the example of fig. 2, the light reflecting layer 4 may be formed in a rectangular shape. The light-reflecting layer 4 comprises two light-reflecting transverse strips 41 and seven light-reflecting longitudinal strips 42. Wherein, seven vertical reflecting strips 42 can be arranged between two horizontal reflecting strips 41 at regular intervals along the serial and parallel directions. Both ends of each reflective horizontal bar 41 are respectively connected with the reflective vertical bars 42 at both sides. The five middle reflective longitudinal strips 42 may cover the gap between two adjacent battery strings 21 and the edges of two adjacent battery strings 21, and the two reflective longitudinal strips 42 on the two sides are located at the edges of the battery string layer 2, and may respectively cover the edges of the battery strings 21 on the two sides.

At least one of the plurality of light reflecting longitudinal strips 42 adjacent to the battery piece 211 shielded by the junction box 31 is broken to form at least one opening 43, and the opening 43 is located at the battery piece 211 shielded by the junction box 31, so that the shielding areas of all the battery pieces 211 in the battery string 21 shielded by the junction box 31 are equal.

For example, in the examples of fig. 2 and 3, the junction box 31 may be provided at an intermediate position of the rear panel 3. The junction box 31 shields at least one cell 211 in at least one cell string 21. Accordingly, at least one of the light reflecting longitudinal strips 42 corresponding to the battery sheet 211 shielded by the junction box 31 is broken to form the opening 43, so that shielding of the battery sheet 211 by the junction box 31 can be balanced. Since the junction box 31 blocks at least one cell 211 of at least one cell string 21, the blocking area of the cell 211 in a partial region is too large, and the power of other cells 211 in the cell string 21 that are not blocked is consumed, so that the temperature of the blocking position is increased, and a hot spot phenomenon occurs. Therefore, at least one of the plurality of light reflecting longitudinal strips 42 adjacent to the battery piece 211 shielded by the junction box 31 is disconnected to form at least one opening 43, the opening 43 can avoid shielding the battery piece 211, so that the shielding area of the battery piece 211 shielded by the junction box 31 in the same string of battery strings 21 is equal to the shielding area of other battery pieces 211, the current mismatch of the battery piece 211 is reduced, the reliability of the photovoltaic module 100 is improved, and the reliability risk caused by shielding the back battery piece 211 by the junction box 31 can be effectively avoided.

According to the utility model discloses photovoltaic module 100, through setting up battery cluster layer 2, backplate 3 and including two horizontal strips 41 of reflection of light and the reflector layer 4 of strip 42 is indulged in a plurality of reflection of light to make every reflection of light indulge strip 42 and cover the edge of adjacent battery cluster 21 and a plurality of reflection of light indulge at least one disconnection of battery piece 211 that the terminal box 31 sheltered from in the strip 42 in order to form at least one opening 43, opening 43 department can avoid sheltering from battery piece 211, thereby make all battery pieces 211 in the battery cluster 21 that is sheltered from by terminal box 31 shelter from the area and equal, the electric current mismatch of battery piece 211 has been avoided, photovoltaic module 100 reliability has been improved, can effectively avoid terminal box 31 to shelter from the reliability risk that back battery piece 211 brought.

Optionally, referring to fig. 2 in combination with fig. 3, the junction box 31 is opposite to one of the plurality of vertical reflective strips 42, the opening 43 is formed in the one of the plurality of vertical reflective strips 42, the opening 43 is a through-hole 421, and the through-hole 421 faces the junction box 31. Therefore, by providing the wire through hole 421, the junction box 31 can conduct the current generated by the photovoltaic module 100 to the user while protecting the photovoltaic module 100.

In some embodiments of the present invention, as shown in fig. 2 and 3, the plurality of longitudinal reflective strips 42 includes a plurality of first reflective strips 422 and a plurality of second reflective strips 423, and a first reflective strip 422 is disposed between two adjacent second reflective strips 423. The plurality of junction boxes 31 are arranged in one-to-one correspondence with the plurality of first light reflecting strips 422, and each second light reflecting strip 423 has an opening 43.

For example, in the example of fig. 2 and 3, the photovoltaic module 100 employs three-part junction boxes 31, that is, three junction boxes 31. The light reflecting layer 4 comprises two light reflecting transverse strips 41 and seven light reflecting longitudinal strips 42, and the seven light reflecting longitudinal strips 42 comprise three first light reflecting strips 422 and four second light reflecting strips 423. The three first light reflecting strips 422 and the four second light reflecting strips 423 are arranged in a staggered manner. The three terminal boxes 31 are opposite to the three first reflective strips 422. The four second light reflecting stripes 423 are broken and form four openings 43. Therefore, each second light reflecting strip 423 is provided with the opening 43, so that the shielding areas of all the battery pieces 211 in the battery string 21 shielded by the junction box 31 are equal, and the reliability risk caused by shielding the back battery pieces 211 by the junction box 31 can be effectively avoided.

Optionally, each of the first light reflecting strips 422 has an opening 43 (not shown), and the length of the opening 43 of the first light reflecting strip 422 is less than the length of the opening of the second light reflecting strip 423. So set up, the opening 43 of first reflection of light strip 422 can avoid sheltering from to battery piece 211 equally, has further guaranteed that the sheltered area of all battery pieces 211 in the battery cluster 21 that is sheltered from by terminal box 31 equals, guarantees photovoltaic module 100's reliability.

In some embodiments of the present invention, the length of the opening 43 is l, wherein l satisfies: l is more than 0mm and less than or equal to 500 mm. Specifically, for example, when l > 500mm, the length of the opening 43 is too long, so that the length of the light reflecting longitudinal strip 42 other than the opening 43 is too short, which may reduce the power of the photovoltaic module 100. Thus, by letting l satisfy: l is more than 0mm and less than or equal to 500mm, the length of the opening 43 is reasonable, and the photovoltaic module 100 can be ensured to have higher power while ensuring that the shielding areas of all the battery pieces 211 in the battery string 21 shielded by the junction box 31 are equal.

In some embodiments of the present invention, the distance between two adjacent battery pieces 211 in each battery string 21 is d, where d satisfies: d is more than or equal to 0mm and less than or equal to 2 mm. For example, when the distance d is 0mm, the distance between two adjacent battery pieces 211 in the same battery string 21 is zero, that is, there is no connection between two adjacent battery pieces 211 in each battery string 21; when d is 2mm, the distance between two adjacent battery pieces 211 in the same battery string 21 is 2mm, and the plurality of battery pieces 211 in each battery string 21 are arranged at intervals; when d is more than 0mm and less than 2mm, two adjacent battery slices 211 in the same battery string 21 are connected at a small interval. Thus, by making the distance d satisfy: d is not less than 0mm and not more than 2mm, a gap between two adjacent battery pieces 211 in each battery string 21 is smaller or has no gap, the arrangement of the plurality of battery pieces 211 is more compact, the adjacent battery pieces 211 are convenient to electrically connect, and the size of the photovoltaic module 100 can be smaller, so that the efficiency of the photovoltaic module 100 can be improved, and the auxiliary material cost of the photovoltaic module 100 can be reduced.

Optionally, each longitudinal reflective strip 42 has a width w, where w satisfies: w is more than or equal to 2mm and less than or equal to 15 mm. For example, when the width w is less than 2mm, the width of each vertical reflective strip 42 is too small to cover the gap between two adjacent cell strings 21, which may reduce the power of the photovoltaic module 100; when w is greater than 15mm, the width of each of the light reflecting longitudinal strips 42 is too large, which may result in an excessively large shielding area for the cell piece 211. Thus, by making w satisfy: w is more than or equal to 2mm and less than or equal to 15mm, and the power of the photovoltaic module 100 is ensured, and the overlarge shielding area of the cell 211 can be effectively avoided.

In some embodiments of the present invention, referring to fig. 2, the width of the two reflective horizontal strips 41 and the two reflective vertical strips 42 on the outermost side in the string juxtaposition direction is greater than the width of the remaining reflective vertical strips 42. For example, since the two reflective lateral strips 41 and the two reflective longitudinal strips 42 outermost in the string juxtaposition direction are located at the edge of the cell string layer 2, the edge of the cell string layer 2 has an electrical gap to ensure the safety of the photovoltaic module 100. The electrical gap is the shortest spatial distance measured between two conductive parts or between a conductive part and an equipment protection interface, namely, the shortest distance for insulation can be realized through air under the condition of ensuring the stability and safety of electrical performance. Therefore, the two transverse reflective strips 41 and the two longitudinal reflective strips 42 on the outermost side in the serial parallel direction can cover the electric gap, and the light utilization rate of the photovoltaic module 100 is guaranteed.

Alternatively, the light reflecting layer 4 may be a light reflecting coating (not shown) coated on one side surface of the back sheet 3 adjacent to the cell string layer 2. So set up, the reflector layer 4 can improve positive power and back power simultaneously to promote photovoltaic module 100's two-sided rate, and the processing of being convenient for.

Or alternatively, as shown in fig. 1, an encapsulation adhesive film 6 is disposed between the back plate 3 and the battery string layer 2, and the reflective layer 4 is disposed on the encapsulation adhesive film 6. Specifically, the reflective layer 4 may be embedded in the packaging adhesive film 6, and the surface of the reflective layer 4 is flush with the surface of one side of the packaging adhesive film 6 in the thickness direction. For example, a white polymer material may be compounded into a transparent polymer material with the shape of the light-reflecting layer 4 as a template. The packaging adhesive film 6 may be one or more of ethylene-vinyl acetate, polyolefin material and polyethylene foam. Therefore, the thickness difference does not exist between the reflecting layer 4 and the packaging adhesive film 6, the problem of lamination and splitting of the photovoltaic module 100 can be effectively avoided, and the yield of the photovoltaic module 100 can be improved.

Of course, the present invention is not limited thereto, and the reflective layer 4 may be bonded to the back plate 3 by an adhesive. For example, when the back sheet 3 is made of glass and the line holes 421 are formed in the light reflecting longitudinal strips 42, the back sheet 3 is easily cracked. At this time, the reflective layer 4 may be processed in advance, and then the reflective layer 4 is adhered to the back plate 3. Thereby, the structural strength of the backsheet 3 can be prevented from being affected, so that the structural stability of the photovoltaic module 100 can be ensured.

Of course, the light reflecting layer 4 may also be printed on one side surface of the packaging adhesive film 6. It should be understood by those skilled in the art that the preparation method of the reflective layer 4 is not limited in any way, as long as the reflective layer 4 is ensured to be the reflective layer 4 disposed on the adhesive packaging film 6.

Alternatively, the light reflecting layer 4 may be a titanium dioxide piece, a white glaze piece or a white polymer material piece. So set up, can have white reflector layer 4 on messenger's backplate 3 or the encapsulation glued membrane 6 to can improve the light utilization ratio, improve photovoltaic module 100's power and two-sided rate, and can improve the power gain at the two glass photovoltaic module 100 backs. Of course, the material of the light reflecting layer 4 may also be other materials like white glaze, and is not limited herein.

Alternatively, the photovoltaic module 100 may be a symmetrical structure symmetrical in the string arrangement direction. For example, in the example of fig. 2 and 3, the photovoltaic module 100 is in an up-down symmetrical structure. The photovoltaic module 100 may be symmetrical left and right (as shown in fig. 2 and fig. 3), or asymmetrical left and right, as long as the photovoltaic module 100 is in a vertically symmetrical structure. Therefore, the photovoltaic module 100 has a symmetrical structure, is simple in structure, convenient to process and high in appearance attractiveness.

In some alternative embodiments of the present invention, each of the light reflecting longitudinal strips 42 has a length a, and the maximum distance between two battery sheets 211 farthest from each other in the string arrangement direction is b, where a and b satisfy: a/b is more than or equal to 0.7 and less than or equal to 1.3. Specifically, for example, when a/b is 0.7, the length of the light-reflecting longitudinal strip 42 is smaller than the maximum distance between the two battery pieces 211 that are farthest from each other in the string arrangement direction, for example, the light-reflecting longitudinal strip 42 may have an opening 43; when a/b is 1.3, the length of the light reflecting longitudinal strip 42 is greater than the maximum distance between the two battery pieces 211 farthest away in the string arrangement direction, and at least one end of the light reflecting longitudinal strip 42 exceeds the outermost edge of at least one of the two battery pieces farthest away in the string arrangement direction. So set up, can guarantee that photovoltaic module 100 has better light utilization ratio.

The process of making photovoltaic module 100 is described below in conjunction with fig. 1.

As shown in fig. 1, the packaging adhesive film 6 is a backside packaging adhesive film. The photovoltaic module 100 comprises a front transparent plate 1, a front packaging adhesive film 5, a battery string layer 2, a packaging adhesive film 6 and a back plate 3 from top to bottom in sequence. When the photovoltaic module 100 is manufactured, the front transparent plate 1, the front packaging adhesive film 5, the battery string layer 2, the packaging adhesive film 6 and the back plate 3 are sequentially placed so as to complete preparation work before lamination of the double-glass photovoltaic module 100. And then, after vacuumizing and heating lamination is carried out on the laminated five-layer structure comprising the front transparent plate 1, the front packaging adhesive film 5, the battery string layer 2, the packaging adhesive film 6 and the back plate 3, the front packaging adhesive film 5 and the packaging adhesive film 6 are crosslinked and cured to protect the battery string layer 2, and finally firm bonding of the five-layer structure (namely the front transparent plate 1, the front packaging adhesive film 5, the battery string layer 2, the packaging adhesive film 6 and the back plate 3) is realized, and the photovoltaic module 100 is manufactured by additionally installing an aluminum alloy frame (not shown in the figure), a junction box 31 and sealing by adopting silica gel.

Other constructions and operations of the photovoltaic module 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, comprising:

a battery string layer including a plurality of battery strings, each of the battery strings including a plurality of battery cells;

the back plate is arranged below the battery string layer, one side of the back plate, which is far away from the battery string layer, is provided with at least one junction box, and the junction box shields at least one battery sheet of at least one battery string;

the reflecting layer is arranged between the battery string layer and the back plate and comprises two reflecting transverse strips and a plurality of reflecting longitudinal strips, the two reflecting transverse strips are arranged at intervals in the string arrangement direction of the photovoltaic module, the plurality of reflecting longitudinal strips are connected between the two reflecting transverse strips at intervals along the string parallel direction perpendicular to the string arrangement direction, each reflecting longitudinal strip covers the edge of the adjacent battery string, at least one of the plurality of reflecting longitudinal strips, which is adjacent to the battery piece and is shielded by the junction box, is disconnected to form at least one opening, and the opening is positioned at the battery piece shielded by the junction box, so that the shielding areas of all the battery pieces in the battery string shielded by the junction box are equal.

2. The photovoltaic module according to claim 1, wherein the junction box is opposite to one of the plurality of the vertical reflecting strips, the opening is formed in the one of the plurality of the vertical reflecting strips, and the opening is a through wire passing hole which is opposite to the junction box.

3. The photovoltaic module according to claim 1, wherein the plurality of longitudinal reflective strips comprises a plurality of first reflective strips and a plurality of second reflective strips, and one first reflective strip is disposed between two adjacent second reflective strips;

the terminal box is a plurality of, a plurality of the terminal box with a plurality of the first reflection of light strip one-to-one sets up, every the second reflection of light strip all has the opening.

4. The photovoltaic module of claim 3, wherein each of the first light reflecting strips has the opening, and the length of the opening of the first light reflecting strip is less than the length of the opening of the second light reflecting strip.

5. The photovoltaic module of claim 1, wherein the opening has a length/, wherein/: l is more than 0mm and less than or equal to 500 mm.

6. The photovoltaic module according to claim 1, wherein a distance between two adjacent cells in each of the cell strings is d, wherein d satisfies: d is more than or equal to 0mm and less than or equal to 2 mm.

7. The photovoltaic module according to any one of claims 1 to 6, wherein each of the light-reflecting longitudinal strips has a width w, wherein w satisfies: w is more than or equal to 2mm and less than or equal to 15 mm.

8. The photovoltaic module according to any one of claims 1 to 6, wherein the width of two of the light-reflecting lateral strips and two of the light-reflecting longitudinal strips outermost in the serial-parallel direction is greater than the width of the remaining light-reflecting longitudinal strips.

9. The photovoltaic module of any of claims 1-6 wherein the light reflecting layer is a light reflecting coating applied to a surface of the backsheet adjacent to a side of the cell string layer.

10. The photovoltaic module according to any one of claims 1 to 6, wherein an encapsulation adhesive film is disposed between the back sheet and the cell string layer, and the light reflecting layer is disposed on the encapsulation adhesive film.

11. The photovoltaic module of any of claims 1-6 wherein the light-reflective layer is adhesively attached to the backsheet by an adhesive.

12. The assembly according to any of claims 1-6, wherein the assembly is symmetrical in the string direction.

13. The photovoltaic module according to any one of claims 1 to 6, wherein each of the light-reflecting longitudinal strips has a length of a, and a maximum distance between two of the cells farthest away in the string arrangement direction is b, wherein a and b satisfy: a/b is more than or equal to 0.7 and less than or equal to 1.3.