photovoltaic modules

Abstract

The present application provides a photovoltaic module, which relates to the field of photovoltaic technology. The photovoltaic module includes a battery cell and a backplane, and the backplane includes a metal film layer; the photovoltaic module also includes a bus bar, which is electrically connected to the battery cell, and the backplane includes a backplane hole, and the bus bar passes through the backplane hole; the photovoltaic module includes a first state, and the first state is the state before lamination and during lamination; in the first state, the photovoltaic module also includes a bus bar fixing gasket, and the bus bar fixing gasket is located on the side of the backplane away from the battery cell, and the bus bar passes through the bus bar fixing gasket. The photovoltaic module provided by the present application limits the bus bar by the bus bar fixing gasket before lamination and during lamination, which is conducive to preventing the bus bar from shifting during the production line flow and lamination process and contacting the metal film layer at the backplane hole opening, thereby helping to improve the problem of leakage short circuit caused by the contact between the bus bar and the metal film layer in the backplane hole, and further helping to improve the reliability of the photovoltaic module.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and more specifically, to a photovoltaic component. Background Art

[0002] Photovoltaic modules are mainly divided into single-glass photovoltaic modules and double-glass photovoltaic modules. Among them, single-glass photovoltaic modules are not resistant to water vapor in a long-term hot and humid aging environment, resulting in problems such as large power attenuation and abnormal appearance. In related technologies, single-glass photovoltaic modules include backplanes, batteries, adhesive films, front covers and frames, among which the backplane plays a key role in the water vapor resistance of single-glass photovoltaic modules. However, the water vapor resistance of ordinary backplanes is poor. In view of the above situation, aluminum-containing backplanes can improve the above problems. However, after opening the backplane hole on the aluminum-containing backplane, the aluminum foil will be exposed around the hole. When the bus bar is led out, there is a risk that the bus bar will contact the aluminum foil, resulting in leakage short circuit.

[0003] Therefore, how to overcome the above problems has become one of the technical problems that need to be solved urgently at this stage. Utility Model Content

[0004] In view of this, the utility model provides a photovoltaic module, which limits the bus bar by means of a bus bar fixing gasket, so as to improve the problem of leakage short circuit caused by contact between the bus bar and the metal film layer in the back plate.

[0005] The present application provides a photovoltaic module, the photovoltaic module comprising a cell and a backplane, the backplane is located on the backlight side of the cell, and the backplane comprises a metal film layer;

[0006] The photovoltaic module further includes a bus bar, the bus bar is electrically connected to the battery sheet, the back plate includes a back plate hole, the back plate hole penetrates the back plate along a first direction, the bus bar passes through the back plate hole, and the first direction is the thickness direction of the back plate;

[0007] The photovoltaic assembly includes a first state, the first state being a state before lamination and during lamination;

[0008] In the first state, the photovoltaic assembly further includes a busbar fixing gasket, the busbar fixing gasket is located on a side of the back plate away from the solar cell, and the orthographic projection of the back plate hole along the first direction on the plane where the photovoltaic assembly is located is located within the orthographic projection of the busbar fixing gasket along the first direction on the plane where the photovoltaic assembly is located;

[0009] The bus bar fixing gasket includes a first through hole, the first through hole penetrates the bus bar fixing gasket along the first direction, and the bus bar passes through the first through hole.

[0010] Optionally, where:

[0011] The busbar fixing gasket includes a base layer and a non-stick material layer, the base layer and the non-stick material layer are stacked along the first direction, and the non-stick material layer is located between the base layer and the back plate.

[0012] Optionally, where:

[0013] The base layer is made of polyethylene terephthalate plastic, or hard plastic, or the same material as the back plate;

[0014] The non-stick material layer is a high-temperature cloth or a release film.

[0015] Optionally, where:

[0016] The busbar fixing gasket has a thickness H1 along the first direction, 0.3 mm≤H1≤1 mm.

[0017] Optionally, where:

[0018] In the first state, the photovoltaic module includes a high temperature tape, which is at least partially attached to a side of the busbar fixing gasket away from the back plate and at least partially attached to a side of the back plate away from the battery cell.

[0019] Optionally, where:

[0020] The photovoltaic module further comprises a back adhesive film, and the back adhesive film is located between the battery cell and the back plate.

[0021] Optionally, where:

[0022] The photovoltaic assembly further comprises a second state, wherein the second state is a laminated state;

[0023] In the second state, the back plate hole is filled with the back adhesive film.

[0024] Optionally, where:

[0025] In the second state, the photovoltaic assembly does not include the busbar fixing gasket.

[0026] Optionally, where:

[0027] In the second state, the photovoltaic assembly includes the bus bar fixing gasket.

[0028] Optionally, where:

[0029] The photovoltaic module further comprises a front adhesive film and a front cover plate. The front adhesive film is located on a side of the battery cell away from the back plate, and the front cover plate is located on a side of the front adhesive film away from the back plate.

[0030] Compared with the prior art, the photovoltaic module provided by the utility model achieves at least the following beneficial effects:

[0031] The present application provides a photovoltaic module, which includes a battery cell and a backplane, wherein the backplane is located on the backlight side of the battery cell, and the backplane includes a metal film layer; the photovoltaic module also includes a bus bar, which is electrically connected to the battery cell, and the backplane includes a backplane hole, which penetrates the backplane along a first direction, and the bus bar passes through the backplane hole, and the first direction is the thickness direction of the backplane; the photovoltaic module includes a first state, and the first state is the state before lamination and during lamination; in the first state, the photovoltaic module also includes a bus bar fixing gasket, which is located on the side of the backplane away from the battery cell, and the orthographic projection of the backplane hole along the first direction on the plane where the photovoltaic module is located is located within the orthographic projection of the bus bar fixing gasket along the first direction on the plane where the photovoltaic module is located; the bus bar fixing gasket includes a first through hole, which penetrates the bus bar fixing gasket along the first direction, and the bus bar passes through the first through hole. The photovoltaic module provided in the present application limits the bus bar by means of bus bar fixing gaskets before and during lamination, which helps prevent the bus bar from shifting during the production line flow and lamination process and contacting the metal film layer at the back plate hole opening, thereby helping to improve the problem of leakage short circuit caused by the contact between the bus bar and the metal film layer in the back plate hole, and further helps to improve the reliability of the photovoltaic module.

[0032] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

[0033] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0035] Figure 1 Shown is a schematic top view of a photovoltaic module provided in an embodiment of the present application;

[0036] Figure 2 This application is shown Figure 1 A schematic cross-sectional view along AA';

[0037] Figure 3 Shown is a schematic top view of a busbar fixing gasket provided in an embodiment of the present application;

[0038] Figure 4 This application is shown Figure 3 A schematic cross-sectional view along BB';

[0039] Figure 5 Shown is a cross-sectional schematic diagram of another photovoltaic module provided in an embodiment of the present application;

[0040] Figure 6 Shown is a cross-sectional schematic diagram of another photovoltaic module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0042] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0043] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0044] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] The inventors found in their research that when a single-glass photovoltaic module uses an aluminum-containing backplane, it has good resistance to water vapor. However, the metal film layer will be exposed at the backplane holes of the aluminum-containing backplane. When the bus bar is led out, there is a risk of the bus bar coming into contact with the aluminum foil, causing leakage and short circuit.

[0047] Therefore, how to overcome the above problems has become one of the technical problems that need to be solved urgently at this stage.

[0048] In view of this, the utility model provides a photovoltaic module, which limits the bus bar by means of a bus bar fixing gasket, so as to improve the problem of leakage short circuit caused by contact between the bus bar and the metal film layer in the back plate.

[0049] The following is a detailed description with reference to the accompanying drawings and specific embodiments.

[0050] Figure 1 FIG. 1 is a schematic top view of a photovoltaic module provided in an embodiment of the present application. Figure 2 This application is shown Figure 1 A schematic cross-sectional view along AA', Figure 3FIG. 1 is a top view of a busbar fixing gasket provided in an embodiment of the present application. Please refer to FIG. Figure 1 , Figure 2 and Figure 3 The present application provides a photovoltaic module 100, the photovoltaic module 100 includes a battery cell 10 and a back sheet 20, the back sheet 20 is located on the backlight side of the battery cell 10, and the back sheet 20 includes a metal film layer 21; the photovoltaic module 100 also includes a bus bar 30, the bus bar 30 is electrically connected to the battery cell 10, the back sheet 20 includes a back sheet hole 22, the back sheet hole 22 penetrates the back sheet 20 along a first direction D1, the bus bar 30 passes through the back sheet hole 22, and the first direction D1 is the thickness direction of the back sheet 20; the photovoltaic module 100 includes a first state, the first state is before lamination and The state during lamination; in the first state, the photovoltaic module 100 also includes a bus bar fixing gasket 40, which is located on the side of the back plate 20 away from the battery cell 10, and the orthographic projection of the back plate hole 22 along the first direction D1 on the plane where the photovoltaic module 100 is located is located within the orthographic projection of the bus bar fixing gasket 40 along the first direction D1 on the plane where the photovoltaic module 100 is located; the bus bar fixing gasket 40 includes a first through hole 41, which penetrates the bus bar fixing gasket 40 along the first direction D1, and the bus bar 30 passes through the first through hole 41.

[0051] Specifically, the present application provides a photovoltaic module 100, which includes a cell 10 and a back sheet 20, wherein, in order to improve the water vapor resistance of the back sheet 20, the back sheet 20 includes a metal film layer 21, and the present application provides an optional implementation mode in which the metal film layer 21 includes aluminum foil, which is conducive to improving the water vapor resistance of the back sheet 20. The back sheet 20 also includes a back sheet hole 22, which penetrates the back sheet 20 along a first direction D1, and the metal film layer 21 is exposed in the back sheet hole 22. The photovoltaic module 100 also includes a cell 10 and a bus bar 30, and the bus bar 30 is electrically connected to the cell 10 and then led out from the back sheet hole 22. When the photovoltaic module 100 is in a state before and during lamination, the photovoltaic module 100 also includes a bus bar fixing gasket 40, which is located on the side of the back panel 20 away from the battery cell 10, and the bus bar fixing gasket 40 covers the back panel hole 22, and the bus bar fixing gasket 40 includes a first through hole 41, and the bus bar 30 passes through the back panel hole 22 and then passes out from the first through hole 41. In this way, the bus bar 30 is limited by the bus bar fixing gasket 40, which is beneficial to prevent the bus bar 30 from shifting, and further helps to avoid the bus bar 30 from contacting the exposed metal film layer 21 in the back panel hole 22, thereby helping to improve the problem of leakage short circuit caused by the contact between the bus bar 30 and the metal film layer 21 in the back panel 20, and helping to improve the reliability of the photovoltaic module 100.

[0052] It should be noted that the first through hole 41 is adapted to the shape and structure of the busbar 30, which is conducive to the first through hole 41 playing a limiting role, thereby facilitating the busbar 30 from moving. However, the present application does not specifically limit the shape of the first through hole 41, which can be designed according to actual conditions, as long as it can play a limiting role on the busbar 30. At the same time, the present application does not limit the number of first through holes 41 in the busbar fixing gasket 40, which can be designed according to actual conditions. Please refer to Figures 1 to 3 The present application provides an optional implementation scheme in which two bus bars 30 are led out of the back plate hole 22, and the bus bar fixing gasket 40 includes two first through holes 41. The first through holes 41 are rectangular in shape, and the bus bars 30 correspond to the first through holes 41 one by one. Such a configuration is not only conducive to preventing the bus bar 30 from contacting the exposed metal film layer 21 in the back plate hole 22, but also conducive to preventing the two bus bars 30 in the same back plate hole 22 from contacting each other, and is more conducive to improving the reliability of the photovoltaic module 100.

[0053] It should also be noted that the drawings in this application are for illustration only and do not represent their actual size, quantity and structure. Figure 1 In order to clearly illustrate the relationship between the bus bar fixing gasket 40 and the back plate hole 22 , the bus bar fixing gasket 40 is set to be transparent.

[0054] It should be noted that the cell 10 in the present application can be a PERC cell (emitter and back passivation cell), a TOPCON cell (oxide passivation contact cell), an HJT cell (intrinsic thin film heterojunction cell), an IBC cell (interdigitated back contact cell) or a perovskite cell, etc., which can be selected according to actual needs and is not specifically limited in the present application.

[0055] Please continue to refer to Figure 1The present application provides an optional implementation manner in which the back plate hole 22 is rectangular in shape, two bus bars 30 are led out of one back plate hole 22, the bus bar fixing gasket 40 is rectangular in shape, and one bus bar fixing gasket 40 includes two first through holes 41. Optionally, the width of the back plate hole 22 along the second direction D2 is W1, 8mm≤W1≤25mm, for example, the width W1 of the back plate hole 22 along the second direction D2 can be 10mm, 14.5mm, 22mm, etc.; the length of the back plate hole 22 along the third direction D3 is L1, 14mm≤L1≤30mm, for example, the length L1 of the back plate hole 22 along the third direction D3 can be 12mm, 19.5mm, 2 8mm, etc.; the width of the bus bar fixing gasket 40 along the second direction D2 is W2, 10mm≤W2≤30mm, for example, the width W2 of the bus bar fixing gasket 40 along the second direction D2 can be 12mm, 18mm, 25mm, etc.; the length of the bus bar fixing gasket 40 along the third direction D3 is L2, 15mm≤L1≤35mm, for example, the length L2 of the bus bar fixing gasket 40 along the third direction D3 can be 15mm, 21mm, 30mm, etc. It should be noted that the size of the bus bar fixing gasket 40 needs to be larger than the size of the corresponding back plate hole 22, so that the bus bar fixing gasket 40 can be fixed on the side of the back plate 20 away from the battery cell 10. Regarding the size of the first through hole 41, optionally, the width of the first through hole 41 along the third direction D3 is W3, 0.2mm≤W3≤6mm, for example, the width W3 of the first through hole 41 along the third direction D3 can be 1mm, 3mm, 5mm, etc.; the length of the first through hole 41 along the second direction D2 is L3, 4mm≤L1≤8mm, for example, the length L3 of the first through hole 41 along the second direction D2 can be 4mm, 6mm, 7mm, etc. It should be noted that the size of the first through hole 41 is sufficient to allow the bus bar 30 to be smoothly inserted. This application only provides the above parameters for reference and is not limited thereto.

[0056] It is understandable that appropriately enlarging the back plate hole 22 is also beneficial to prevent the bus bar 30 from contacting the exposed metal film layer 21 in the back plate hole 22 , thereby helping to improve the reliability of the photovoltaic module 100 .

[0057] Figure 4 This application is shown Figure 3 A cross-sectional diagram along BB', please refer to Figure 2-Figure 4 The present application provides an optional implementation mode, wherein the busbar fixing gasket 40 comprises a base layer 401 and a non-stick material layer 402, the base layer 401 and the non-stick material layer 402 are stacked along a first direction D1, and the non-stick material layer 402 is located between the base layer 401 and the back plate 20. Optionally, the base layer 401 is a polyethylene terephthalate plastic, or a hard plastic, or the same material as the back plate 20; the non-stick material layer 402 is a high-temperature cloth or a release film.

[0058] Specifically, the bus bar fixing gasket 40 includes a base layer 401 and a non-stick material layer 402. The non-stick material layer 402 is located on the side of the back plate 20 away from the battery cell 10, and the base layer 401 is located on the side of the non-stick material layer 402 away from the battery cell 10. When the bus bar fixing gasket 40 needs to be removed, in order to prevent the bus bar fixing gasket 40 from adhering to the back plate 20 or the adhesive film after lamination, the non-stick material layer 402 between the base layer 401 and the back plate 20 uses a high-temperature cloth or a release film to isolate the back plate 20 and the base layer 401. At the same time, in order to improve the leakage short circuit problem caused by the contact between the busbar 30 and the exposed metal film layer 21 in the back plate hole 22, the busbar fixing gasket 40 needs to have a certain supporting performance. Therefore, the base layer 401 needs to use a material with a certain hardness. The present application provides an optional implementation that the base layer 401 includes polyethylene terephthalate plastic; the present application provides another optional implementation that the base layer 401 includes hard plastic; the present application provides another optional implementation that the base layer 401 includes the material of the back plate 20. It should be noted that the back plate 20 is a composite film composed of multiple layers of polymer films that are rolled and bonded together, and is mainly composed of three layers, including a fluorine-containing film, a PET layer, and an EVA bonding layer.

[0059] Please refer to Figure 2 Optionally, the busbar fixing gasket 40 has a thickness H1 along the first direction D1, and 0.3 mm ≤ H1 ≤ 1 mm.

[0060] Specifically, when the thickness H1 of the bus bar fixing gasket 40 along the first direction D1 is less than 0.3mm, the thickness of the bus bar fixing gasket 40 is too thin, the limiting effect on the bus bar 30 is poor, and the quality of the bus bar fixing gasket 40 is poor and it is easy to break; when the thickness H1 of the bus bar fixing gasket 40 along the first direction D1 is greater than 1mm, the thickness of the bus bar fixing gasket 40 is too thick, and the bus bar fixing gasket 40 may cause the battery cell 10 to break during lamination; therefore, the thickness H1 of the bus bar fixing gasket 40 along the first direction D1 is set to 0.3mm≤H1≤1mm. Such a setting is beneficial to preventing the battery cell 10 from breaking, and is also beneficial to limiting the bus bar 30, thereby helping to improve the leakage short circuit problem caused by the contact between the bus bar 30 and the exposed metal film layer 21 in the back plate hole 22. The present application provides an optional implementation manner that the thickness H1 of the bus bar fixing gasket 40 is 0.4 mm; the present application provides another optional implementation manner that the thickness H1 of the bus bar fixing gasket 40 is 0.8 mm; the present application provides another optional implementation manner that the thickness H1 of the bus bar fixing gasket 40 is set to 0.5 mm ≤ H1 ≤ 0.9 mm.

[0061] Please continue to refer to Figure 2The present application provides an optional implementation scheme that, in a first state, the photovoltaic module 100 includes a high-temperature tape (not shown in the figure), and the high-temperature tape is at least partially attached to the side of the busbar fixing gasket 40 away from the back plate 20, and at least partially attached to the side of the back plate 20 away from the battery cell 10.

[0062] Specifically, in this embodiment, the bus bar fixing gasket 40 is fixed to the side of the back plate 20 away from the battery cell 10 by high-temperature tape. On the one hand, the high-temperature tape is used to fix the bus bar fixing gasket 40, which is beneficial to prevent the bus bar fixing gasket 40 from shifting and causing poor limiting effect on the bus bar 30. On the other hand, the use of high-temperature tape is more convenient than other bonding methods, and is beneficial to reducing the impact of high temperature on bonding during lamination, which is beneficial to preventing the bus bar fixing gasket 40 from shifting, thereby further helping to improve the leakage short circuit problem caused by the contact between the bus bar 30 and the exposed metal film layer 21 in the back plate hole 22, and thus helping to improve the reliability of the photovoltaic module 100.

[0063] Please continue to refer to Figure 2 The present application provides an optional implementation manner in which the photovoltaic module 100 further includes a backside adhesive film 50 , and the backside adhesive film 50 is located between the cell 10 and the back plate 20 .

[0064] Specifically, the photovoltaic module 100 also includes a back adhesive film 50. The back adhesive film 50 is usually made of polyethylene-polyvinyl acetate copolymer (EVA for short), polyolefin elastomer (POE for short) or polyvinyl butyral (PVB for short). The back adhesive film 50 is located between the battery cell 10 and the back plate 20, and is used to encapsulate and protect the battery cell 10, which is beneficial to prevent the external environment from affecting the performance of the battery cell 10, and can bond the battery cell 10 and the back plate 20 together, and has a certain bonding strength.

[0065] Figure 5 FIG. 1 is a cross-sectional schematic diagram of another photovoltaic module provided in an embodiment of the present application. Please refer to FIG. Figure 5 The present application provides an optional implementation manner in which the photovoltaic module 100 further includes a second state, which is a laminated state; in the second state, the back plate hole 22 is filled with the back adhesive film 50 .

[0066] Specifically, the photovoltaic module 100 includes a first state and a second state, the first state is the state before and during lamination, and the second state is the state after lamination. In the first state of the photovoltaic module 100, the cell 10, the back adhesive film 50 and the back plate 20 are stacked, the back plate 20 includes a back plate hole 22, the bus bar fixing gasket 40 is located on the side of the back plate hole 22 away from the cell 10, and the bus bar 30 passes through the back plate hole 22 and the first through hole 41 in the bus bar fixing gasket 40. The back adhesive film 50 melts during lamination, and after lamination, the back adhesive film 50 overflows the back plate hole 22, that is, in the second state of the photovoltaic module 100, the back adhesive film 50 fills the back plate hole 22, and the bus bar 30 is further fixed by the back adhesive film 50, which is also conducive to improving the insulation effect between the bus bar 30 and the back plate 20, thereby improving the reliability of the photovoltaic module 100.

[0067] Figure 6 FIG. 1 is a cross-sectional schematic diagram of another photovoltaic module provided in an embodiment of the present application. Please refer to FIG. Figure 6 The present application provides an optional implementation mode that, in the second state, the photovoltaic assembly 100 does not include the bus bar fixing gasket 40 .

[0068] Specifically, in the present embodiment, when the photovoltaic module 100 is in the second state, the back panel hole 22 is filled with the back side adhesive film 50. The back side adhesive film 50 in the back panel hole 22 is conducive to improving the leakage short circuit problem caused by the contact between the bus bar 30 and the exposed metal film layer 21 in the back panel hole 22. Therefore, the bus bar fixing gasket 40 can be removed after lamination, that is, the photovoltaic module 100 after lamination does not include the bus bar fixing gasket 40. With this arrangement, the bus bar fixing gasket 40 removed from the photovoltaic module 100 can be reused, which is conducive to reducing production costs.

[0069] It should be noted that the drawings in this application are for illustration only and do not represent their actual structure. Figure 5 and Figure 6 Both represent a photovoltaic module 100 in a second state. The second state is the photovoltaic module 100 after lamination. After lamination, the front adhesive film 60 and the back adhesive film 50 will adhere together to protect the battery cell 10, but Figure 5 and Figure 6 The figure is only used to illustrate that the back adhesive film 50 fills the back plate hole 22 , and the relative relationship between the front adhesive film 60 and the back adhesive film 50 after lamination is not shown.

[0070] Please refer to Figure 5 The present application provides an optional implementation manner that, in the second state, the photovoltaic assembly 100 includes a bus bar fixing gasket 40 .

[0071] Specifically, in the first state of the photovoltaic module 100, the bus bar 30 is limited and fixed by the bus bar fixing gasket 40, which is beneficial to improve the leakage short circuit problem caused by the contact between the bus bar 30 and the exposed metal film layer 21 in the back plate hole 22. In the second state, the back side adhesive film 50 fills the back plate hole 22, which is beneficial to improve the insulation effect between the bus bar 30 and the back plate 20. In this embodiment, when the photovoltaic module 100 is in the second state, the photovoltaic module 100 still includes the bus bar fixing gasket 40, that is, there is no need to remove the bus bar fixing gasket 40 after lamination, which is beneficial to improving the production efficiency of the production line and thus to improving the production capacity.

[0072] It should be noted that, in the second state of the photovoltaic component 100, the busbar fixing gasket 40 can be removed or retained according to actual usage requirements, and this application does not make any specific limitations.

[0073] Please refer to Figure 1 and Figure 2 The present application provides an optional implementation manner in which the photovoltaic module 100 further includes a front adhesive film 60 and a front cover plate 70 , wherein the front adhesive film 60 is located on the side of the battery cell 10 away from the back plate 20 , and the front cover plate 70 is located on the side of the front adhesive film 60 away from the back plate 20 .

[0074] Specifically, the photovoltaic module 100 includes a back sheet 20, a back adhesive film 50, a battery cell 10, a front adhesive film 60 and a front cover plate 70 stacked along a first direction D1, wherein the front adhesive film 60 and the back adhesive film 50 are made of materials generally used for polyethylene-polyvinyl acetate copolymer (EVA for short), polyolefin elastomer (POE for short) or polyvinyl butyral (PVB for short), and the front adhesive film 60 and the back adhesive film 50 are located on both sides of the battery cell 10, and are used to encapsulate and protect the battery cell 10, which is beneficial to prevent the external environment from affecting the performance of the battery cell 10, and can bond the battery cell 10 and the back sheet 20 as well as the battery cell 10 and the front cover plate 70 together, with a certain bonding strength. The front cover plate 70 is located on the side of the front adhesive film 60 away from the battery cell 10, and its material is generally ultra-white glass with a high light transmittance. The backplane 20 is located on the side of the back adhesive film 50 away from the battery cell 10. In order to improve the water vapor resistance of the backplane 20, the backplane 20 includes a metal film layer 21. The backplane 20 also includes a backplane hole 22. The side of the backplane hole 22 away from the battery cell 10 also includes a bus bar fixing gasket 40. After the bus bar 30 is electrically connected to the battery cell 10, it is led out from the backplane hole 22 and passes through the first through hole 41 in the bus bar fixing gasket 40. Such a configuration is conducive to improving the leakage short circuit problem caused by the contact between the bus bar 30 and the exposed metal film layer 21 in the backplane hole 22, thereby helping to improve the reliability of the photovoltaic module 100.

[0075] In summary, the photovoltaic module provided by the utility model achieves at least the following beneficial effects:

[0076] A photovoltaic module provided by the present application includes a battery cell and a backplane, wherein the backplane is located on the backlight side of the battery cell, and the backplane includes a metal film layer; the photovoltaic module also includes a bus bar, which is electrically connected to the battery cell, and the backplane includes a backplane hole, which penetrates the backplane along a first direction, and the bus bar passes through the backplane hole, and the first direction is the thickness direction of the backplane; the photovoltaic module includes a first state, and the first state is the state before lamination and during lamination; in the first state, the photovoltaic module also includes a bus bar fixing gasket, which is located on the side of the backplane away from the battery cell, and the orthographic projection of the backplane hole along the first direction on the plane where the photovoltaic module is located is located within the orthographic projection of the bus bar fixing gasket along the first direction on the plane where the photovoltaic module is located; the bus bar fixing gasket includes a first through hole, which penetrates the bus bar fixing gasket along the first direction, and the bus bar passes through the first through hole. The photovoltaic module provided in the present application limits the bus bar by means of bus bar fixing gaskets before and during lamination, which helps prevent the bus bar from shifting during the production line flow and lamination process and contacting the metal film layer at the back plate hole opening, thereby helping to improve the problem of leakage short circuit caused by the contact between the bus bar and the metal film layer in the back plate hole, and further helps to improve the reliability of the photovoltaic module.

[0077] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises a cell and a backplane, wherein the backplane is located on the backlight side of the cell, and the backplane comprises a metal film layer; The photovoltaic module further includes a bus bar, the bus bar is electrically connected to the battery sheet, the back plate includes a back plate hole, the back plate hole penetrates the back plate along a first direction, the bus bar passes through the back plate hole, and the first direction is the thickness direction of the back plate; The photovoltaic assembly includes a first state, the first state being a state before lamination and during lamination; In the first state, the photovoltaic assembly further includes a busbar fixing gasket, the busbar fixing gasket is located on a side of the back plate away from the solar cell, and the orthographic projection of the back plate hole along the first direction on the plane where the photovoltaic assembly is located is located within the orthographic projection of the busbar fixing gasket along the first direction on the plane where the photovoltaic assembly is located; The bus bar fixing gasket includes a first through hole, the first through hole penetrates the bus bar fixing gasket along the first direction, and the bus bar passes through the first through hole.

2. The photovoltaic module according to claim 1, characterized in that: The busbar fixing gasket includes a base layer and a non-stick material layer, the base layer and the non-stick material layer are stacked along the first direction, and the non-stick material layer is located between the base layer and the back plate.

3. The photovoltaic module according to claim 2, characterized in that: The base layer is made of polyethylene terephthalate plastic, or hard plastic, or the same material as the back plate; The non-stick material layer is a high-temperature cloth or a release film.

4. The photovoltaic module according to claim 1, characterized in that: The busbar fixing gasket has a thickness H1 along the first direction, 0.3 mm≤H1≤1 mm.

5. The photovoltaic module according to claim 1, characterized in that: In the first state, the photovoltaic module includes a high temperature tape, which is at least partially attached to a side of the busbar fixing gasket away from the back plate and at least partially attached to a side of the back plate away from the battery cell.

6. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module further comprises a back adhesive film, and the back adhesive film is located between the battery cell and the back plate.

7. The photovoltaic module according to claim 6, characterized in that: The photovoltaic assembly further comprises a second state, wherein the second state is a laminated state; In the second state, the back plate hole is filled with the back adhesive film.

8. The photovoltaic module according to claim 7, characterized in that: In the second state, the photovoltaic assembly does not include the busbar fixing gasket.

9. The photovoltaic module according to claim 7, characterized in that: In the second state, the photovoltaic assembly includes the bus bar fixing gasket.

10. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module further comprises a front adhesive film and a front cover plate. The front adhesive film is located on a side of the battery cell away from the back plate, and the front cover plate is located on a side of the front adhesive film away from the back plate.

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