Photovoltaic module and photovoltaic system

Abstract

The utility model provides a photovoltaic module and a photovoltaic system. The photovoltaic module comprises a first protection plate, a second protection plate, a plurality of battery strings, a first light reflection part and a second light reflection part. The second protection plate and the first protection plate are stacked. The plurality of battery strings are arranged between the first protection plate and the second protection plate and are arranged at intervals along the second direction, and each battery string comprises a plurality of battery pieces arranged at intervals along the first direction. The first light reflecting part is arranged on the surface of the second protection plate and is positioned in a string gap between the adjacent battery strings and / or a sheet gap between the adjacent battery sheets. The second reflective part is arranged on the surface of the second protection plate, the second reflective part and the side edge of the second protection plate are arranged at an interval, and at least part of the second reflective part is arranged between the battery string and / or the battery piece close to the side edge of the second protection plate and the side edge of the second protection plate. By arranging the first light reflecting part and the second light reflecting part, the light receiving conditions of the battery strings at all positions are roughly the same, and the light utilization rate is improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more particularly, to photovoltaic modules and photovoltaic systems. Background Art

[0002] The function of a solar cell is to convert solar energy into electrical energy to provide energy for terminal devices. A photovoltaic module is an important part of a solar cell system and generates electricity by the light flux incident on its cells. The amount of light flux determines the power generation of the photovoltaic module. The cells / strings in the photovoltaic module are arranged at intervals, so that the light at the edge gaps of the cells / strings and the gaps between adjacent cells / strings is wasted, thereby affecting the incident amount of light per unit area. In order to increase the incident amount of light per unit area in the photovoltaic module and improve the light utilization rate in the gap area in the prior art, a reflective sticker is usually arranged in the gap area. However, the reflective strip setting structure in the prior art easily causes inconsistent light reception of different cells, and there is also a problem of seal failure caused by the offset of the reflective strip during the lamination and evacuation process of the photovoltaic module. Summary of the Utility Model

[0003] This application provides a photovoltaic module and a photovoltaic system having the same to solve the above technical problems.

[0004] Embodiments of this application are implemented as follows:

[0005] A photovoltaic module includes a first protection plate, a second protection plate, a plurality of cell strings, a first reflective member, and a second reflective member. The second protection plate is stacked with the first protection plate. The plurality of cell strings are arranged between the first protection plate and the second protection plate and are spaced apart along a second direction. Each cell string includes a plurality of cells spaced apart along a first direction. The first reflective member is disposed on the surface of the second protection plate. The first reflective member is spaced apart along the first direction and / or the second direction. The first reflective member is located at the string gap between adjacent cell strings and / or the chip gap between adjacent cells. The second reflective member is disposed on the surface of the second protection plate. The second reflective member is spaced apart from the side edge of the second protection plate. At least a part of the second reflective member is disposed between the cell string and / or the cell adjacent to the side edge of the second protection plate and the side edge of the second protection plate.

[0006] In this way, by providing the first reflective member corresponding to the gap area between adjacent cell strings or adjacent cells, and providing the second reflective member corresponding to the outer edge gap area of the cell string or the cell, the light reception conditions of the cell strings at each position are substantially the same, improving the light utilization rate and reducing the risk of electrical mismatch. Also, by spacing the second reflective member from the side edge of the second protection plate, the problem of offset of the reflective member during the lamination and evacuation process can be avoided, preventing the reflective member from inserting into the sealing area at the edge of the photovoltaic module, thereby maintaining the sealing effect of the photovoltaic module and reducing the risk of seal failure.

[0007] In a possible implementation: the thickness of the second light-reflecting member is less than that of the first light-reflecting member. The second light-reflecting member includes a protective layer, a reflective base layer, and a second adhesive layer arranged in sequence, and the second adhesive layer connects to the second protective plate, so as to reduce the influence of the second light-reflecting member on the sealing performance of the photovoltaic module. The second light-reflecting member includes a protective layer, a reflective base layer, and a second adhesive layer arranged in sequence, and the second adhesive layer connects to the second protective plate.

[0008] In a possible implementation: a plurality of first light-reflecting members are arranged at intervals on the second protective plate, and the first light-reflecting member adjacent to the side of the second protective plate partially overlaps with the second light-reflecting member.

[0009] In a possible implementation: the overlapping width of the second light-reflecting member and the first light-reflecting member is greater than or equal to 2 mm and less than the width of the second light-reflecting member.

[0010] In a possible implementation: the orthographic projection of the battery string and / or the battery cell adjacent to the side of the second protective plate on the second protective plate partially overlaps with the second light-reflecting member. In this way, for the second light-reflecting member corresponding to the gap area of the battery string and the battery cell at the outer edge, the battery string on the outside can also receive the light reflected by the second light-reflecting member, so that the light-receiving conditions of the battery strings at each position are roughly the same, fully improving the light utilization rate and reducing the risk of electrical mismatch.

[0011] In a possible implementation: the distance between the second light-reflecting member and the side of the second protective plate is d, where d ≥ 5 mm. By restricting the distance between the second light-reflecting member and the side of the second protective plate, it is ensured that the second light-reflecting member will not shift during the lamination and evacuation process, reducing the influence on the sealing effect of the photovoltaic module.

[0012] In a possible implementation: the first light-reflecting member is a conductive light-reflecting member, and the second light-reflecting member is an insulating light-reflecting member. The second light-reflecting member is an insulating light-reflecting member to ensure the insulation effect and avoid electric leakage.

[0013] In a possible implementation: the first light-reflecting member includes an insulating layer, a reflective layer, a prism structure layer, a substrate layer, and a first adhesive layer arranged in sequence. The first adhesive layer connects to the second protective plate. The reflective layer is made of a metal material, and the width of the reflective layer is greater than the string spacing between adjacent battery strings and / or the chip spacing between adjacent battery cells. In this way, the large width can reduce the light leakage caused by the deviation of the chip gap or string gap and the position of the light-reflecting member due to the slippage of the battery string or battery cell during lamination, thereby improving the light utilization rate.

[0014] In a possible implementation: The prism structure layer includes prism units. One side of the prism unit facing the cell has a first reflection surface and a second reflection surface. The first reflection surface and the second reflection surface are adjacent to each other, and an included angle a is formed between the first reflection surface and the second reflection surface, where 100° ≤ a ≤ 150°. The number of prism units is multiple, and multiple prism units are arranged side by side on one side of the substrate layer facing the battery string. By restricting the range of the included angle between the first reflection surface and the second reflection surface, light can be reflected onto the battery string as much as possible, improving the light utilization rate.

[0015] An embodiment of the present application further provides a photovoltaic system, which includes the photovoltaic module of the above embodiment or a combination of embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic plan view of a photovoltaic module according to an embodiment of the present application.

[0018] Figure 2 For Figure 1 It is a schematic partial view of the shown photovoltaic module.

[0019] Figure 3 It is a schematic cross-sectional view of a photovoltaic module.

[0020] Figure 4 It is another schematic cross-sectional view of a photovoltaic module.

[0021] Figure 5 It is a schematic cross-sectional view of a first light reflector.

[0022] Figure 6 It is a schematic cross-sectional view of a second light reflector.

[0023] Figure 7 It is a schematic partial view of a photovoltaic module in another embodiment.

[0024] MAIN ELEMENT SYMBOL DESCRIPTION:

[0025] Photovoltaic module 100

[0026] First protection plate 10

[0027] Second protection plate 20

[0028] Battery string 30

[0029] Solar cell 31

[0030] First reflector 40

[0031] Insulating layer 41

[0032] Reflection layer 42

[0033] Prism structure layer 43

[0034] Prism unit 431

[0035] First reflecting surface 4311

[0036] Second reflecting surface 4312

[0037] Substrate layer 44

[0038] First adhesive layer 45

[0039] Second reflector 50

[0040] Protective layer 51

[0041] Reflection base layer 52

[0042] Second adhesive layer 53

[0043] Encapsulation adhesive film 60

[0044] Frame 70

[0045] First direction A

[0046] Second direction B

[0047] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0048] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0049] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. When an element is considered to be "disposed on" another element, it can be directly disposed on the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0051] Some embodiments of this application will be described in detail. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0052] See Figure 1 , Figure 2 , Figure 3 and Figure 4 , this embodiment provides a photovoltaic module 100, which includes a first protection plate 10, a second protection plate 20, a plurality of battery strings 30, a first reflector 40, and a second reflector 50. The second protection plate 20 is stacked with the first protection plate 10. The first protection plate 10 and the second protection plate 20 can be glass plates or other transparent material protection plates. The plurality of battery strings 30 are sequentially and spaced apart along the second direction B between the first protection plate 10 and the second protection plate 20, and each battery string 30 includes a plurality of battery cells 31 spaced apart along the first direction A. The first reflector 40 is disposed on the surface of the second protection plate 20, and the projection of the string gap between adjacent battery strings 30 on the second protection plate 20 falls into the area where the first reflector 40 is located, so that the string gap area between adjacent battery strings 30 corresponds to the first reflector 40, and the first reflector 40 can reflect the light at the string gap area to the battery string 30, so that the light in the string gap area can be utilized. Similarly, the projection of the gap between adjacent battery cells 31 on the second protection plate 20 falls into the area where the first reflector 40 is located, so that the gap area between adjacent battery cells 31 also corresponds to the first reflector 40, and the first reflector 40 can reflect the light at the gap area to the battery cell 31, so that the light in the gap area can be utilized.

[0053] The second reflector 50 is disposed on the surface of the second protection plate 20, and the second reflector 50 is spaced apart from the side edge of the second protection plate 20, which can avoid the problem of reflector offset during the lamination and evacuation process, prevent the reflector from being inserted into the sealing area at the edge of the photovoltaic module 100, thereby maintaining the sealing effect of the photovoltaic module 100 and reducing the risk of sealing failure. The projection of the battery cell 31 near the side edge of the second protection plate 20 on the second protection plate 20 partially overlaps with the second reflector 50, so that the second reflector 50 corresponding to the outer edge gap area of the edge battery cell 31 enables the outer battery cell 31 to also receive the light reflected from the second reflector 50, thereby making the light-receiving conditions of the battery cells 31 at each position substantially the same, fully improving the light utilization rate, and reducing the risk of electrical mismatch.

[0054] In the illustration, the first direction A represents the length direction of the photovoltaic module 100. The second direction B represents the width direction of the photovoltaic module 100. The photovoltaic module 100 further includes a frame 70, which is disposed on the peripheral sides of the first protection plate 10 and the second protection plate 20 and is hermetically connected to the first protection plate 10 and the second protection plate 20 to achieve the encapsulation of the photovoltaic module 100 and provide an installation site for the connection between the photovoltaic module 100 and other structures.

[0055] Please refer to Figure 3 and Figure 4 as shown in Figure 3 FIG. 10 is a schematic cross-sectional structure diagram of the photovoltaic module 100 viewed from the width direction, Figure 4 and FIG. 12 is a schematic cross-sectional structure diagram of the photovoltaic module 100 viewed from the length direction.

[0056] In some embodiments, the four second reflective members 50 are respectively disposed near the four peripheral side edges of the second protection plate 20 to reflect the light in the edge gap of the edge solar cell 31 to the solar cell 31 located at the edge position.

[0057] The distance between the second reflective member 50 and the side edge of the second protection plate 20 is d, where d≥5 mm, preferably 8 mm≤d≤12 mm. Specifically, whether in the first direction A or the second direction B, the distance d between the second reflective member 50 and the side edge of the second protection plate 20 is greater than or equal to 5 mm. On the one hand, during the lamination and vacuum pumping process, the negative pressure acting on the second reflective member 50 can be reduced, thereby avoiding the problem of sealing failure of the photovoltaic module 100 caused by the offset of the second reflective member 50; on the other hand, setting the distance d to be greater than or equal to 5 mm can make the distance between the edge of the second reflective member 50 and the edge of the second protection plate 20 meet the requirements of the International Electrotechnical Commission (IEC) for creepage distance, that is, ensuring the shortest distance between two different potentials on the surface of an electrical device or component to prevent problems such as corona discharge and insulation breakdown.

[0058] In addition, leaving a distance d between the second reflective member 50 and the side edge of the second protection plate 20 can allow the side regions of structures such as the first protection plate 10 and the second protection plate 20 to fit well during the lamination and vacuum pumping process, ensuring the sealing effect of the photovoltaic module 100 and extending the service life of the photovoltaic module 100.

[0059] In a possible implementation manner: the distance d between the second reflective member 50 and the side edge of the second protection plate 20 satisfies: 10.4 mm≤d≤11.7 mm, preferably 10.4 mm, so as to meet the sealing requirements of the photovoltaic module 100 while ensuring the light utilization rate at the edge gap.

[0060] In other embodiments, the distance d between the second reflector 50 and the side of the second protective plate 20 may also be: 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.1 mm, 10.2 mm, 10.3 mm, 10.4 mm, 10.5 mm, 10.6 mm, 10.7 mm, 10.8 mm, 10.9 mm, 11 mm, 11.1 mm, 11.2 mm, 11.3 mm, 11.4 mm, 11.5 mm, 11.6 mm, 11.7 mm, 11.8 mm, 11.9 mm, 12 mm, etc., and the present application is not limited thereto.

[0061] In the present application, by restricting the distance between the second reflector 50 and the side of the second protective plate 20, it is ensured that the second reflector 50 will not shift during the lamination and evacuation process, reducing the impact on the sealing effect of the photovoltaic module 100.

[0062] In the embodiments of the present application, multiple first reflectors 40 are arranged at intervals along the first direction A or the second direction B on the second protective plate 20, and are correspondingly arranged with the string gap region between the battery strings 30 and / or the chip gap region between the battery chips 31, so as to reflect the light in the gap region onto the corresponding battery chip 31. The width of the first reflector 40 may be slightly larger than the width of the adjacent chip gap and string gap to reduce the situation where the first reflector 40 is misaligned with the gap due to manufacturing tolerances. The distance between adjacent first reflectors 40 corresponds to the dimension length of the battery chip 31 in the first direction A or the second direction B. In the embodiments of the present application, the chip pitch is smaller than the string pitch. Therefore, the distance between adjacent first reflectors 40 in the first direction A is smaller than the distance between adjacent first reflectors 40 in the second direction B.

[0063] In the embodiments of the present application, the second reflectors 50 arranged on the head and tail sides are wider than the second reflectors 50 arranged on the left and right sides, and the dimension difference range is approximately 5 mm - 8 mm. In one of the embodiments, the width dimension of the second reflectors 50 arranged on the head and tail sides is 11 mm, and the width dimension of the second reflectors 50 arranged on the left and right sides is 5 mm to meet the light reflection requirements and the sealing requirements of the photovoltaic module 100.

[0064] Please continue to refer to Figure 5, in some embodiments, the first reflector 40 includes an insulating layer 41, a reflective layer 42, a prism structure layer 43, a substrate layer 44, and a first adhesive layer 45 arranged in sequence. The first adhesive layer 45 connects to the second protective plate 20 to fix the relative positions of the first reflector 40 and the second protective plate 20. The solar cell 31 can be a back-contact solar cell, that is, a positive electrode and a negative electrode are provided on the back surface of the solar cell 31. The reflective layer 42 is made of a conductive material, such as a metal reflective material with good light reflection performance like aluminum. An insulating layer 41 is provided on the surface of the first reflector 40 to cover the reflective layer 42, which can isolate the metal reflective layer 42 from the solar cell 31 and avoid short-circuit problems. In other embodiments, electrodes of the same polarity can also be provided on the back surface of the solar cell 31, and the embodiments of the present application are not limited thereto. The string gap and the cell gap are at least partially overlapped with the projection of the reflective layer 42 on the second protective plate 20 in the orthographic projection of the second protective plate 20, and preferably fall within the projection range of the reflective layer 42, so that the reflective layer 42 can fully reflect the light in the gap area. The prism structure layer 43 and the reflective layer 42 provided on the surface of the prism structure layer 43 can reflect the light in the gap area to the solar cells 31 on both sides of the gap, and evenly distribute the light-receiving situation.

[0065] Furthermore, an encapsulation adhesive film 60 is also provided between the first protective plate 10 and the second protective plate 20, which is used to bond and seal the first protective plate 10, the second protective plate 20, and other internal structures. The insulating layer 41 on the surface of the first reflector 40 can be a non-conductive adhesive film. On the one hand, it isolates the conductive reflective layer 42, and on the other hand, it can level and fill the uneven surfaces of the reflective layer 42 and the prism structure layer 43, reducing the risk of generating bubbles and holes inside the photovoltaic module 100. The material of the non-conductive adhesive film can be the same as that of the encapsulation adhesive film 60. After the lamination process of the photovoltaic module 100, the compatibility between the insulating layer 41 and the encapsulation adhesive film 60 is good, which will not affect the light reflection performance of the first reflector 40 and will not generate bubbles inside the photovoltaic module 100.

[0066] In some embodiments, the prism structure layer 43 includes prism units 431, and the cross-section of the prism unit 431 is generally triangular. One side of the prism unit 431 facing the cell 31 has a first reflecting surface 4311 and a second reflecting surface 4312. The first reflecting surface 4311 and the second reflecting surface 4312 are adjacent to each other, and an angle a is formed between the first reflecting surface 4311 and the second reflecting surface 4312, where 100° ≤ a ≤ 150°, preferably 120°, to achieve total internal reflection of light. By restricting the range of the angle between the first reflecting surface 4311 and the second reflecting surface 4312, light can be reflected onto each cell 31 as much as possible, improving the light utilization rate. In other embodiments, the angle a between the first reflecting surface 4311 and the second reflecting surface 4312 can also be: 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, etc., and the present application is not limited thereto.

[0067] In some embodiments, the number of the prism units 431 is multiple, and the multiple prism units 431 are arranged side by side on one side of the substrate layer 44 facing the battery string 30, which is beneficial to fully reflect the light in the gap area to the cell 31 and improve the light utilization rate.

[0068] In some embodiments, the thickness of the second reflector 50 is less than that of the first reflector 40, so that the thickness of the reflector at the edge of the second protection plate 20 is relatively thin. When maintaining a sufficient distance, the relatively thin second reflector 50 can further reduce the impact on the sealing performance of the photovoltaic module 100.

[0069] Please continue to refer to Figure 6 , the second reflector 50 includes a protective layer 51, a reflective base layer 52, and a second adhesive layer 53 arranged in sequence. The second adhesive layer 53 connects the second protection plate 20 to fix the relative position of the second reflector 50 and the second protection plate 20. In the embodiments of the present application, the protective layer 51 can be a weather-resistant coating, which has good heat resistance, moisture resistance, light transmittance and other properties, and is beneficial to extending the service life of the second reflector 50. The reflective base layer 52 can include polyethylene terephthalate material, that is, a PET base layer, which is a reflective layer 42 with insulation properties. It can reflect the light at the edge gap to the cell 31 on the edge of the cell 31 in a diffuse reflection manner, effectively utilize the light in the edge gap area, reduce the difference in the light reception of the cells 31 at each position, and reduce the risk of electrical mismatch.

[0070] Please refer to Figure 7 , in some embodiments, multiple first reflectors 40 are arranged at intervals on the second protection plate 20, and the first reflector 40 adjacent to the side of the second protection plate 20 partially overlaps with the second reflector 50.

[0071] In this way, the first reflector 40 and the second reflector 50 can form a composite reflector in the gap area between the battery string 30 at the edge and the edge of the second protection plate 20. The projection of the battery cell 31 at the edge on the second protection plate 20 partially overlaps with the first reflector 40, enabling the light in the edge gap area to be reflected onto the edge battery cell 31 in two forms: diffuse reflection and specular reflection. This is beneficial for increasing the light reflection effect at the edge gap and further improving the light utilization rate. At the same time, the partially stacked first reflector 40 and second reflector 50 generally form a structure that is narrow on the outside and thick on the inside, which can reduce the impact on the sealing effect of the photovoltaic module 100 while enhancing the light reflection effect.

[0072] In some embodiments, the overlapping width w of the second reflector 50 and the first reflector 40 is greater than or equal to 2 mm to ensure the connection strength between the two reflectors. The overlapping width w of the second reflector 50 and the first reflector 40 is also less than the width of the second reflector 50 to prevent the side of the first reflector 40 from extending beyond the second reflector 50 and affecting the sealing effect of the photovoltaic module 100 during the lamination and evacuation process. At the same time, the distance between the side of the second reflector 50 facing away from the first reflector 40 and the side of the second protection plate 20 is greater than or equal to 5 mm to meet the sealing requirements and creepage requirements.

[0073] An embodiment of the present application also provides a photovoltaic system, which includes the photovoltaic module 100 described in the above embodiment or a combination of embodiments.

[0074] The photovoltaic module 100 and the photovoltaic system of the present application are provided with a first reflector 40 corresponding to the gap area between adjacent battery strings 30 and / or adjacent battery cells 31, and a second reflector 50 corresponding to the outer edge gap area of the battery cell 31 at the edge, so that the light-receiving conditions of the battery cells 31 at each position are substantially the same, improving the light utilization rate and reducing the risk of electrical mismatch. Also, by spacing the second reflector 50 from the side of the second protection plate 20, the problem of reflector offset during the lamination and evacuation process can be avoided, preventing the reflector from inserting into the sealing area at the edge of the photovoltaic module 100, thereby maintaining the sealing effect of the photovoltaic module 100 and reducing the risk of sealing failure.

[0075] The above embodiments are only used to illustrate the technical solutions of the present application and are not restrictive. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A photovoltaic module, characterized in that: include: a first protection plate; A second protection plate, stacked with the first protection plate; A plurality of battery strings are disposed between the first protection plate and the second protection plate and are arranged at intervals along the second direction, each of the battery strings comprising a plurality of battery cells arranged at intervals along the first direction; A first reflector is disposed on the surface of the second protective plate, the first reflectors are arranged at intervals along the first direction and / or the second direction, and the first reflectors are located at the string gaps between adjacent battery strings and / or the sheet gaps between adjacent battery sheets; A second reflector is arranged on the surface of the second protective plate. The second reflector is spaced apart from the side of the second protective plate. At least part of the second reflector is arranged between the battery string and / or the battery cell adjacent to the side of the second protective plate and the side of the second protective plate.

2. The photovoltaic module according to claim 1, characterized in that: The thickness of the second reflective member is smaller than that of the first reflective member. The second reflective member includes a protective layer, a reflective base layer and a second adhesive layer which are arranged in sequence. The second adhesive layer is connected to the second protective plate.

3. The photovoltaic module according to claim 1, characterized in that: A plurality of the first reflectors are arranged at intervals on the second protection plate, and the first reflectors adjacent to the side edge of the second protection plate partially overlap with the second reflectors.

4. The photovoltaic module according to claim 3, characterized in that: The overlapping width of the second reflector and the first reflector is greater than or equal to 2 mm and smaller than the width of the second reflector.

5. The photovoltaic module according to claim 1, characterized in that: The orthographic projection of the battery string and / or the battery sheet adjacent to the side edge of the second protection plate on the second protection plate partially overlaps with the second reflective member.

6. The photovoltaic module according to claim 1, characterized in that: The distance between the second reflective element and the side edge of the second protective plate is d, wherein d≥5 mm.

7. The photovoltaic module according to any one of claims 1 to 6, characterized in that: The first reflective element is a conductive reflective element, and the second reflective element is an insulating reflective element.

8. The photovoltaic module according to claim 7, characterized in that: The first reflective member includes an insulating layer, a reflective layer, a prism structure layer, a substrate layer and a first adhesive layer arranged in sequence, the first adhesive layer is connected to the second protective plate, the reflective layer is made of a metal material, and the width of the reflective layer is greater than the string spacing between adjacent battery strings and / or the cell spacing between adjacent battery cells.

9. The photovoltaic module according to claim 8, characterized in that: The prism structure layer includes a prism unit, and the prism unit has a first reflection surface and a second reflection surface on a side facing the battery string, the first reflection surface is adjacent to the second reflection surface, and an angle a is formed between the first reflection surface and the second reflection surface, wherein 100°≤a≤150°; The number of the prism units is multiple, and the multiple prism units are arranged in parallel on a side of the substrate layer facing the battery string.

10. A photovoltaic system, characterized in that: The photovoltaic system comprises the photovoltaic module according to any one of claims 1 to 9.

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