Photovoltaic module

Abstract

The utility model relates to the technical field of photovoltaic cells, in particular to a photovoltaic module. The photovoltaic module comprises a battery pack, a back adhesive film, a back plate and a first reflective part, and the battery pack, the back adhesive film and the back plate are stacked in the thickness direction of the photovoltaic module. The first light reflecting part is arranged on the side, facing the back face adhesive film, of the back plate and arranged on at least one side edge of the back plate in the circumferential direction of the photovoltaic module, and the first light reflecting part is provided with an exhaust part. According to the photovoltaic module, the first light reflecting part is provided with the exhaust hole, so that the first light reflecting part is prevented from blocking the discharge of bubbles in the photovoltaic module, the excessive back adhesive film in the photovoltaic module is prevented from driving the first light reflecting part to slide, and the risk that the appearance of the photovoltaic module is poor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic cells, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic panels are equipment that can convert solar energy into electrical energy and provide the electricity to facilities within the use area to meet the electricity needs of production and life.

[0003] There are no cells on the side areas of the photovoltaic module, so the sunlight that hits the side areas of the photovoltaic module cannot be used by the cells. Therefore, a reflective film can be attached to the side areas of the back panel or the back glass, so that the light that hits the reflective film can be reflected and reapplied to the cells to improve the light utilization rate of the photovoltaic module.

[0004] Existing reflective film tapes easily form obstructions, increasing the difficulty of discharging bubbles inside photovoltaic modules, causing bubbles to appear around the photovoltaic modules, resulting in defective photovoltaic modules. Utility Model Content

[0005] The present application provides a photovoltaic module, which aims to solve the problems of lamination bubbles and reflective element slippage.

[0006] The present application provides a photovoltaic assembly, the photovoltaic assembly comprising:

[0007] Battery pack;

[0008] Back film;

[0009] A back plate, wherein the battery pack, the back adhesive film and the back plate are stacked along the thickness direction of the photovoltaic module;

[0010] The first reflector is arranged on the side of the back plate facing the back adhesive film and along the circumference of the photovoltaic module, the first reflector is arranged on at least one side of the back plate, and the first reflector is provided with an exhaust portion.

[0011] In a possible design, a plurality of exhaust portions are provided, and the plurality of exhaust portions are spaced apart and distributed along the length direction of the first reflective element;

[0012] Along the width direction of the first reflector, the exhaust portion is an exhaust hole penetrating the first reflector.

[0013] In a possible design, a plurality of exhaust portions are provided, and the plurality of exhaust portions are spaced apart and distributed along the length direction of the first reflective element;

[0014] The exhaust portion is an exhaust groove, and the notch of the exhaust groove is arranged toward the battery pack.

[0015] In a possible design, along the width direction of the first reflector, the cross-section of the exhaust portion includes one or more of a square, a circle, an ellipse, and a regular polygon.

[0016] In a possible design, the first reflective member includes a base layer and an adhesive layer which are stacked;

[0017] The exhaust portion is disposed on the base layer;

[0018] The adhesive layer is bonded to the back plate.

[0019] In a possible design, the end surface of the base layer away from the adhesive layer is a reflective surface.

[0020] In a possible design, the first reflective member further includes a reflective layer;

[0021] The reflective layer, the base layer and the adhesive layer are stacked.

[0022] In a possible design, along the thickness direction of the photovoltaic module, the ratio of the height of the vent portion to the thickness of the base layer is 1 / 2 to 2 / 3.

[0023] In a possible design, along the width direction of the first reflector, the ratio of the total cross-sectional area S1 of the exhaust portion to the total cross-sectional area S2 of the base layer is not greater than 1 / 2.

[0024] In a possible design, the photovoltaic module further includes a front plate, a front adhesive film and a second reflective member;

[0025] The front plate, the front adhesive film, the battery pack, the back adhesive film and the back plate are stacked;

[0026] The second reflector is disposed on a side of the front plate facing the front adhesive film, and along the circumference of the photovoltaic module, the second reflector is disposed on at least one side of the front plate;

[0027] The structure of the second reflector is the same as that of the first reflector.

[0028] In the present application, the base layer of the reflector is provided with exhaust holes, which prevents the reflector from blocking the discharge of bubbles inside the photovoltaic module and prevents the excess adhesive film inside the photovoltaic module from causing the reflector to slip, thereby reducing the risk of poor appearance of the photovoltaic module.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A schematic diagram of the stacking of photovoltaic modules provided in this application;

[0031] Figure 2 This is a schematic diagram of the first reflective member provided in the present application being arranged around the back plate;

[0032] Figure 3 This is a schematic diagram of the first reflective member provided in the present application being arranged on two sides of the back plate;

[0033] Figure 4 This is a schematic diagram of the first reflective member provided in the present application being arranged on two sides of the back plate;

[0034] Figure 5 This is a schematic diagram of the first reflective member provided in the present application being arranged on one side of the back plate;

[0035] Figure 6 This is a schematic diagram of the second reflective member provided in the present application being arranged around the front plate;

[0036] Figure 7 A schematic cross-sectional view of the first reflective element / second reflective element provided in this application;

[0037] Figure 8 A schematic cross-sectional view of the first reflective element / second reflective element provided in this application;

[0038] Fig. 9 This is a schematic diagram of the cross-sectional shape of the exhaust portion provided in this application.

[0039] Reference numerals:

[0040] 1- Photovoltaic modules;

[0041] 11-Battery pack;

[0042] 12-back adhesive film;

[0043] 13- back plate;

[0044] 14-a first reflective member;

[0045] 141-exhaust part;

[0046] 142-base layer;

[0047] 142a- reflective surface;

[0048] 143-adhesive layer;

[0049] 144-reflective layer;

[0050] 15-front plate;

[0051] 16-front film;

[0052] 17- Second reflective member.

[0053] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0054] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0055] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0057] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0059] The existing reflective film tapes used for photovoltaic modules are all solid in design. When the reflective film tapes are applied around the photovoltaic modules, the presence of the reflective film tapes hinders the discharge of gas inside the photovoltaic modules during the lamination process, which in turn leads to bubbles around the photovoltaic modules. Moreover, during the lamination process, due to the high pressure of excess adhesive film squeezing outward, the reflective film tapes attached to the side areas of the back panel or back glass are easy to slip outward, resulting in a poor appearance of the photovoltaic modules.

[0060] To this end, this embodiment provides a photovoltaic module to solve the above technical problems.

[0061] like Figure 1 The figure shows a cross-sectional schematic diagram of a photovoltaic module 1, which includes a front plate 15, a front adhesive film 16, a battery group 11, a back adhesive film 12 and a back plate 13. Along the thickness direction Z of the photovoltaic module 1, the front plate 15, the front adhesive film 16, the battery group 11, the back adhesive film 12 and the back plate 13 are stacked.

[0062] In some embodiments, the photovoltaic module 1 can be a single glass module. That is, the front plate 15 is a tempered glass plate, which is located on the light-facing side of the battery pack 11, used to transmit sunlight, and also used to improve the waterproof and moisture-proof ability of the photovoltaic module 1. The back plate 13 is located on the backlight side of the battery pack 11, and the front plate 15 and the back plate 13 jointly seal the battery pack 11. During the lamination process of the photovoltaic module 1, the front adhesive film 16 and the back adhesive film 12 are used to encapsulate and package the battery pack 11 to prevent the external environment from affecting the performance of the battery pack 11, and at the same time, the front plate 15, the battery pack 11 and the back plate 13 can be bonded into a whole.

[0063] The materials of the front film 16 and the back film 12 may be the same or different. The materials of the front film 16 and the back film 12 may be one of materials such as ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), polyvinyl butyral (PVB), etc., and may also be EPE film (EVA-POE-EVA co-extruded structure) or EP film (EVA-POE co-extruded structure).

[0064] The battery pack includes a plurality of battery strings connected in series or in parallel, and the battery string is formed by a plurality of battery cells connected in series, and adjacent battery cells are connected by welding strips. This embodiment does not limit the structure of the battery cells, and the types of battery cells include but are not limited to Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Heterojunction with Intrinsic Thin-film (HJT), Interdigitated Back Contact (IBC), Perovskite battery, etc.

[0065] For PERC cells, along the thickness direction, PERC cells include front surface metal silver electrode, front surface silicon nitride passivation layer, phosphorus layer emitter, P-type base silicon layer, local aluminum back field, metal aluminum back electrode, back passivation layer (Al2O3 / SiNx). PERC cells use a passivation film to passivate the back, replacing the full aluminum back field, enhancing the internal back reflection of light in the silicon base, reducing the recombination rate on the back, and increasing the efficiency of the cell by 0.5%-1%.

[0066] For TOPCon cells, along the thickness direction, TOPCon cells include metal silver electrodes, front surface silicon nitride passivation layers, boron-doped emitters, N-type base silicon layers, diffused doping layers, ultra-thin silicon oxide, doped polysilicon, silicon nitride, and metal silver electrodes. The back of the cell is composed of a layer of ultra-thin silicon oxide (1nm to 2nm) and a layer of phosphorus-doped microcrystalline amorphous mixed Si film, which together form a passivation contact structure. This structure can block the recombination of minority carrier holes and increase the open circuit voltage and short circuit current of the cell. The ultra-thin oxide layer allows majority electrons to tunnel into the polysilicon layer while blocking the recombination of minority carrier holes. The good passivation effect of ultra-thin silicon oxide and heavily doped silicon film causes the energy band on the silicon wafer surface to bend, thereby forming a field passivation effect, greatly increasing the probability of electron tunneling, reducing contact resistance, and increasing the open circuit voltage and short circuit current of the cell, thereby improving the cell conversion efficiency.

[0067] For HJT cells, along the thickness direction, the HJT cells include a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type base silicon layer, an intrinsic amorphous silicon film, a P-type amorphous silicon film, a back conductive film, and a back low-temperature silver electrode.

[0068] For IBC cells, along the thickness direction, IBC cells include silicon nitride anti-layer, N+ front surface field, N-type base silicon layer, P+ emitter, N+ back field, aluminum oxide passivation layer, silicon nitride anti-reflection layer, and metal silver electrode. IBC cells use ion implantation technology to obtain P and N regions with good uniformity and precisely controllable junction depth. There is no grid line blocking on the front of the cell, which can eliminate the shading current loss of the metal electrode and achieve the maximum utilization of incident photons. The short-circuit current can be increased by about 7% compared with conventional solar cells; due to the back contact structure, there is no need to consider the grid line blocking problem, and the grid line ratio can be appropriately widened, thereby reducing the series resistance and having a high fill factor; the surface passivation and surface light trapping structure can be optimized to obtain a lower front surface recombination rate and surface reflection.

[0069] For perovskite cells, along the thickness direction, the perovskite cell includes substrate material, conductive film, electron transport layer (titanium dioxide), perovskite absorption layer (hole transport layer), and metal cathode. Perovskite materials have a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrode with low loss, so they can generate higher photoelectric voltage and current, making perovskite show higher photoelectric conversion efficiency.

[0070] The battery cell can adopt a multi-busbar solution, which can shorten the current conduction path, reduce internal losses and thus increase the power of the photovoltaic module, while also reducing the cost of the photovoltaic module; it can also adopt a busbar-free solution, replacing the original busbar with a welding ribbon and directly connecting it to the fine grid, which can greatly reduce the silver paste consumption and thus reduce the cost of the photovoltaic module.

[0071] like Figure 2 As shown, in this embodiment, the photovoltaic module 1 further includes a first reflector 14, which is arranged on the side of the back plate 13 facing the back film 12, and the first reflector 14 can reflect the sunlight irradiated along the side of the front plate 15 to the battery group 11. In this embodiment, by arranging the first reflector 14 on the side of the back plate 13 facing the back film 12, the sunlight that is not irradiated to the battery group 11 is reflected back to the battery group 11 again, thereby achieving the purpose of increasing the light utilization rate and improving the efficiency of the photovoltaic module 1.

[0072] Wherein, along the circumference of the photovoltaic module 1, the first reflector 14 is arranged on at least one side of the back plate 13. Exemplarily, the first reflector 14 can be arranged on four sides, three sides, two sides, or one side of the back surface.

[0073] like Figure 2 As shown, the first reflector 14 can be arranged on the four sides of the back surface. The first reflector 14 can be arranged on the two sides of the back plate 13, such as Figure 3 As shown, the first reflector 14 can be arranged on two sides of the back plate 13 along the width direction X. Alternatively, as shown in FIG. Figure 4 As shown, the first reflector 14 can be disposed on two sides of the back plate 13 along the length direction Y. Alternatively, the first reflector 14 can be disposed on one side of the back plate 13 along the length direction Y and the width direction X. Figure 5 As shown, the first reflector 14 can be arranged at one of the sides of the back plate 13 along the width direction X, or the first reflector 14 can be arranged at one of the sides of the back plate 13 along the length direction Y. The specific arrangement position of the first reflector 14 can be set according to actual conditions (such as the exposure of sunlight), and this embodiment does not specifically limit it.

[0074] In some embodiments, the photovoltaic module 1 may be a double-glass module. That is, the front panel 15 and the rear panel are both tempered glass, and both the front panel 15 and the rear panel can transmit sunlight. Figure 6 As shown, in this embodiment, the photovoltaic assembly 1 further includes a second reflector 17 , which is disposed on a side of the front plate 15 facing the front adhesive film 16 , and can reflect sunlight irradiated along the side of the back plate 13 to the battery group 11 .

[0075] In this embodiment, a first reflector 14 is arranged on the side of the back plate 13 facing the back film 12, and a second reflector 17 is arranged on the side of the front plate 15 facing the front film 16, so that sunlight that does not irradiate the battery group 11 is reflected back to the battery group 11 again, thereby achieving the purpose of increasing the light utilization rate and improving the efficiency of the photovoltaic module 1.

[0076] The second reflector 17 is disposed on at least one side of the front plate 15 along the circumference of the photovoltaic module 1. The position of the second reflector 17 disposed on the front plate 15 is the same as the position of the first reflector 14 disposed on the back plate 13, and this embodiment will not be repeated here.

[0077] In addition, the structure of the first reflector 14 is the same as that of the second reflector 17 . This embodiment is described below by taking the first reflector 14 as an example.

[0078] like Figure 7 The figure shows a cross-sectional schematic diagram of the first reflector 14, which includes a laminated base layer 142 and an adhesive layer 143. The first reflector 14 is bonded to the side of the back plate 13 through the adhesive layer 143, and the end surface of the base layer 142 away from the adhesive layer 143 is a reflective surface 142a, through which sunlight can be reflected to the battery pack 11.

[0079] The base layer 142 is provided with a venting portion 141. By providing the venting portion 141 on the base layer 142, the embodiment can prevent the first reflector 14 from blocking the discharge of bubbles inside the photovoltaic module 1, and prevent the first reflector 14 from slipping due to the excess adhesive film, thereby reducing the risk of poor appearance of the photovoltaic module 1.

[0080] Furthermore, the base layer 142 may be made of PET (polyethylene terephthalate) material, which has a certain structural strength to ensure that the exhaust structure can still maintain normal operation during the lamination process.

[0081] Furthermore, the base layer 142 may be made of white PET (polyethylene terephthalate) material, so that the base layer 142 itself can be used as a reflective medium.

[0082] It should be noted that when the lamination and curing are completed, the exhaust portion 141 will also be filled with the back adhesive film 12 to ensure that the reliability of the photovoltaic module 1 is not affected.

[0083] In some embodiments, along the width direction X of the first reflector 14 , the exhaust portion 141 is an exhaust hole penetrating the first reflector 14 .

[0084] In this embodiment, the exhaust portion 141 can be configured as an exhaust hole structure to connect the interior of the laminate with the exterior of the laminate. Laminated bubbles and excess adhesive film can be quickly discharged through the exhaust hole to avoid the generation of laminated bubbles and the risk of the first reflector 14 slipping outward.

[0085] In some embodiments, the exhaust portion 141 may be configured as an exhaust groove, with the notch of the exhaust groove disposed toward the battery pack 11 .

[0086] In this embodiment, the exhaust hole can be set as an exhaust groove structure, and the groove is arranged opposite to the battery pack 11, so that the bubbles generated by lamination and the excess adhesive film can be discharged into the exhaust groove, reducing the risk of bubbles appearing on the side of the photovoltaic component 1 and the first reflector 14 sliding outward.

[0087] like Figure 7 As shown, a plurality of exhaust portions 141 may be provided, and the plurality of exhaust portions 141 are spaced apart along the length direction Y of the first reflector 14. In this embodiment, by providing a plurality of spaced apart exhaust portions 141, the structural strength of the base layer 142 is ensured while ensuring that most of the bubbles generated by lamination can be discharged.

[0088] In some embodiments, along the thickness direction Z of the photovoltaic module 1, the thickness of the base layer 142 is 30 μm to 50 μm, and the ratio of the height of the vent 141 to the thickness of the base layer 142 is 1 / 2 to 2 / 3. For example, the ratio of the height of the vent 141 to the thickness of the base layer 142 can be 1 / 2, 7 / 12, 8 / 15, 3 / 5, 2 / 3, etc.

[0089] In this embodiment, the ratio of the height of the vent portion 141 to the thickness of the base layer 142 should not be too large or too small. If the ratio of the height of the vent portion 141 to the thickness of the base layer 142 is too large (such as when the ratio is greater than 2 / 3), the height of the vent portion 141 may be set too high, and the thickness of the base layer 142 on both sides of the vent portion 141 may be too thin, resulting in a weakened structural strength of the base layer 142, which may be unable to support the lamination of the photovoltaic module 1, thereby causing the vent portion 141 to fail. If the ratio of the height of the vent portion 141 to the thickness of the base layer 142 is too small (such as when the ratio is greater than 1 / 2), the height of the vent portion 141 may be set too small, affecting the discharge of lamination bubbles to the outside.

[0090] In some embodiments, along the width direction X of the first reflector 14, the ratio of the total cross-sectional area S1 of the exhaust portion 141 to the total cross-sectional area S2 of the base layer 142 is not greater than 1 / 2. For example, the ratio of the total cross-sectional area S1 of the exhaust portion 141 to the total cross-sectional area S2 of the base layer 142 may be 1 / 4, 1 / 3, 1 / 2, etc.

[0091] In this embodiment, on the basis of setting the ratio of the height of the exhaust portion 141 to the thickness of the base layer 142 to be 1 / 2 to 2 / 3, the ratio of the total cross-sectional area S1 of the exhaust portion 141 to the total cross-sectional area S2 of the base layer 142 should not be too large. If the ratio of the total cross-sectional area S1 of the exhaust portion 141 to the total cross-sectional area S2 of the base layer 142 is too large (such as S1:S2 is greater than 1 / 2), the size of the exhaust portion 141 may be set too large, resulting in more hollow portions in the base layer 142, which may fail to support the lamination of the photovoltaic module 1, thereby causing the exhaust portion 141 to fail.

[0092] like Figure 8 FIG. 1 is a schematic cross-sectional view of the first reflective member 14. Figure 8 The first reflective member 14 shown includes a reflective layer 144, a base layer 142 and an adhesive layer 143 which are stacked. The first reflective member 14 is bonded to the side of the back plate 13 through the adhesive layer 143. The reflective layer 144 is arranged facing the back adhesive film 12. Sunlight can be reflected to the battery pack 11 through the reflective layer 144. The reflective layer 144 can be a highly reflective coating.

[0093] Furthermore, the base layer 142 is provided with a venting portion 141. The structure of the venting portion 141 in this embodiment is similar to Figure 7 The structure of the exhaust portion 141 shown in FIG. 1 is the same as that of the exhaust portion 141 shown in FIG. 1 , and will not be described in detail in this embodiment.

[0094] like Fig. 9 The cross-sectional view of the exhaust portion 141 is shown. Along the width direction X of the first reflector 14, the cross-section of the exhaust portion 141 can be square, circular, elliptical, regular polygonal, etc. Alternatively, the cross-section of the exhaust portion 141 can also adopt other shapes, which are not specifically limited in this embodiment.

[0095] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module (1) comprises: Battery pack (11); Back adhesive film (12); A back sheet (13), wherein the battery pack (11), the back adhesive film (12) and the back sheet (13) are stacked along the thickness direction (Z) of the photovoltaic module (1); A first reflector (14), wherein the first reflector (14) is arranged on a side of the back plate (13) facing the back adhesive film (12), and along the circumference of the photovoltaic module (1), the first reflector (14) is arranged on at least one side of the back plate (13), and the first reflector (14) is provided with an exhaust portion (141).

2. The photovoltaic module according to claim 1, characterized in that: A plurality of the exhaust portions (141) are provided, and the plurality of the exhaust portions (141) are distributed at intervals along the length direction (Y) of the first reflective element (14); Along the width direction (X) of the first reflector (14), the exhaust portion (141) is an exhaust hole that penetrates the first reflector (14).

3. The photovoltaic module according to claim 1, characterized in that: A plurality of the exhaust portions (141) are provided, and the plurality of the exhaust portions (141) are distributed at intervals along the length direction (Y) of the first reflective element (14); The exhaust portion (141) is an exhaust groove, and the notch of the exhaust groove is arranged toward the battery pack (11).

4. The photovoltaic module according to claim 1, characterized in that: Along the width direction (X) of the first reflective member (14), the cross section of the exhaust portion (141) includes one or more of a square, a circle, an ellipse, and a regular polygon.

5. The photovoltaic module according to claim 1, characterized in that: The first reflective member (14) comprises a base layer (142) and an adhesive layer (143) which are stacked; The exhaust portion (141) is arranged on the base layer (142); The adhesive layer (143) is bonded to the back plate (13).

6. The photovoltaic module according to claim 5, characterized in that: The end surface of the base layer (142) away from the adhesive layer (143) is a reflective surface (142a).

7. The photovoltaic module according to claim 5, characterized in that: The first reflective member (14) further comprises a reflective layer (144); The reflective layer (144), the base layer (142) and the adhesive layer (143) are stacked.

8. The photovoltaic module according to claim 5, characterized in that: Along the thickness direction (Z) of the photovoltaic module (1), the ratio of the height of the exhaust portion (141) to the thickness of the base layer (142) is 1 / 2 to 2 / 3.

9. The photovoltaic module according to claim 5, characterized in that: Along the width direction (X) of the first reflective member (14), the ratio of the total cross-sectional area S1 of the exhaust portion (141) to the total cross-sectional area S2 of the base layer (142) is not greater than 1 / 2.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The photovoltaic module (1) further comprises a front plate (15), a front adhesive film (16) and a second reflective member (17); The front plate (15), the front adhesive film (16), the battery pack (11), the back adhesive film (12) and the back plate (13) are stacked; The second reflector (17) is arranged on a side of the front plate (15) facing the front adhesive film (16), and along the circumference of the photovoltaic module (1), the second reflector (17) is arranged on at least one side of the front plate (15); The structure of the second reflector (17) is the same as that of the first reflector (14).

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