Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, and belongs to the technical field of photovoltaic modules. The photovoltaic module comprises a battery piece; the first TCO layer is stacked on the back surface of the battery piece; the first auxiliary gate is connected to one side, far away from the battery piece, of the first TCO layer; wherein on the plane where the battery piece is located, the first TCO layer has a first projection on the battery piece, the area of the first projection is smaller than that of the battery piece, and the projection of the first auxiliary grid on the battery piece falls into the first projection.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a photovoltaic component. Background Art

[0002] As the core component of photovoltaic modules, the cell can convert light energy into electrical energy. A transparent oxide conductive layer is attached to the surface of the cell, and the current generated by the cell is collected through the transparent oxide conductive layer. The side of the transparent oxide conductive layer away from the cell is connected to the grid line, which serves as the electrode of the cell and can conduct the current collected by the transparent oxide conductive layer.

[0003] In the prior art, a transparent oxide conductive layer is usually formed on the surface of a cell by a deposition method. During the deposition process, a mask is required to cover part of the back side of the cell to prevent the transparent oxide conductive layer on the front side of the cell from connecting to the transparent oxide conductive layer on the back side of the cell, which would cause a short circuit in the cell.

[0004] However, along the width direction of the cell, the grid lines on the back side of the cell near the edge of the cell are easily arranged outside the transparent oxide conductive layer, resulting in some grid lines not being connected to the transparent oxide conductive layer, thereby affecting the photoelectric conversion efficiency of the photovoltaic module. Utility Model Content

[0005] The utility model discloses a photovoltaic module to solve or at least partially solve the problem existing in the prior art that, along the width direction of the cell, the grid lines on the back side of the cell close to the outer side of the cell are easily arranged on the outer side of the transparent oxide conductive layer, resulting in part of the grid lines not being connected to the transparent oxide conductive layer, thereby affecting the photoelectric conversion efficiency of the photovoltaic module.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] The utility model discloses a photovoltaic module, which comprises: a battery cell; a first TCO layer, which is stacked on the back of the battery cell; and a first auxiliary grid, which is connected to a side of the first TCO layer away from the battery cell; wherein, on the plane where the battery cell is located, the first TCO layer has a first projection on the battery cell, the area of ​​the first projection is smaller than the area of ​​the battery cell, and the projection of the first auxiliary grid on the battery cell falls within the first projection.

[0008] Optionally, the first auxiliary grid includes a plurality of strips, the plurality of first auxiliary grids all extend along a first direction and are arranged at intervals along a second direction, and the second direction intersects with the first direction; along the second direction, the battery cell has a first side surface and a second side surface that are oppositely arranged; the distance between the first auxiliary grid closest to the first side surface and the first side surface is L1, and the distance between the surface of the first TCO layer close to the first side surface and the first side surface is L2, wherein L1>L2; the distance between the first auxiliary grid closest to the second side surface and the second side surface is L3, and the distance between the surface of the first TCO layer close to the second side surface and the second side surface is L4, wherein L3>L4.

[0009] Optionally, both L1 and L3 are greater than or equal to 0.7 mm and less than or equal to 1.1 mm, and both L2 and L4 are greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0010] Optionally, L1 and L3 are both equal to 0.75 mm, and L2 and L4 are both equal to 0.5 mm.

[0011] Optionally, the photovoltaic module further includes a second TCO layer and a second auxiliary grid, wherein the second TCO layer is stacked on the front side of the cell, and the second auxiliary grid is connected to a side of the second TCO layer away from the cell; on the plane where the cell is located, the second TCO layer has a second projection on the cell, and the area of ​​the second projection is equal to the area of ​​the cell.

[0012] Optionally, the photovoltaic module further includes a plurality of main grids, wherein the plurality of main grids are all connected to the first TCO layer or the second TCO layer on a side away from the solar cell; the plurality of main grids all extend along a second direction and are arranged at intervals along the first direction, wherein the second direction is perpendicular to the first direction.

[0013] Optionally, along the first direction, the battery cell has a third side and a fourth side that are relatively arranged, and the distance between two adjacent main grids is equal, both are L5; the distance between the main grid closest to the third side and the third side is L6, wherein L6>L5; the distance between the main grid closest to the fourth side and the fourth side is L7, wherein L7>L5.

[0014] Optionally, the battery cell is a rectangular structure, the length of the battery cell is 182.2 mm, and the width is 95.8 mm; the first direction is the length direction of the battery cell, and the second direction is the width direction of the battery cell.

[0015] Optionally, the main grid includes 18 bars, L5 is equal to 9.5 mm, and L6 and L7 are equal to 10.35 mm.

[0016] Optionally, the battery cells include a plurality of battery cells, the plurality of battery cells are arranged at intervals, and a first gap L8 is provided between two adjacent battery cells, wherein L8+L6+L7>2*L5.

[0017] Optionally, the battery cell includes a heterojunction battery cell.

[0018] The photovoltaic module disclosed in the utility model includes a cell, a first TCO layer and a first auxiliary grid, wherein the first TCO layer is stacked on the back of the cell, and the first auxiliary grid is connected to the side of the first TCO layer away from the cell. On the plane where the cell is located, the first TCO layer has a first projection, and the area of ​​the first projection is set to be smaller than the area of ​​the cell to improve the reliability of the cell and avoid the problem of short circuit in the cell. Furthermore, by setting the projection of the first auxiliary grid on the cell to fall within the first projection, the first auxiliary grid can be connected to the first TCO layer, thereby improving the photoelectric conversion efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A cross-sectional view showing a battery cell according to an embodiment of the present utility model;

[0020] Figure 2 A top view showing the back side of the battery cell in the embodiment of the present utility model;

[0021] Figure 3 A partial enlarged view showing a top view of the back side of the battery cell in the embodiment of the utility model;

[0022] Figure 4 A top view of the main grid on the front side of the battery cell in the embodiment of the utility model is shown;

[0023] Figure 5 A top view of the main grid on the back side of the battery cell in the embodiment of the utility model is shown;

[0024] Figure 6 A partial enlarged view of a top view of the main grid on the front side of the cell or a partial enlarged view of a top view of the main grid on the back side of the cell in the embodiment of the utility model;

[0025] Figure 7 The structure diagram of the photovoltaic module in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0026] Figure 8 A schematic diagram showing a structure of a series connection between two adjacent battery cells in an embodiment of the utility model;

[0027] Fig. 9 The structure diagram of the photovoltaic module in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0028] Fig.10 express Fig. 9 Schematic diagram of photovoltaic module structure Figure 2 A partial enlarged view of .

[0029] Reference numerals:

[0030] 10: battery cell; 11: first side; 12: second side; 13: third side; 14: fourth side;

[0031] 20: first TCO layer;

[0032] 30: first secondary grid;

[0033] 40: second TCO layer;

[0034] 50: second auxiliary grid;

[0035] 60: main grid;

[0036] A: first direction; B: second direction. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the fixed scope of the utility model.

[0038] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] Reference Figure 1 , showing a cross-sectional view of the battery cell described in the embodiment of the utility model; referring to Figure 2 , showing a top view of the back side of the battery cell in the embodiment of the utility model; referring to Figure 3 , showing a partial enlarged view of the top view of the back side of the battery cell in the embodiment of the utility model; referring to Figure 4 , showing a top view of the front main grid of the battery cell in the embodiment of the utility model; referring to Figure 5 , showing a top view of the main grid on the back side of the battery cell in the embodiment of the utility model; referring to Figure 6 , showing a partial enlarged view of the top view of the main grid on the front side of the battery cell or a partial enlarged view of the top view of the main grid on the back side of the battery cell in the embodiment of the utility model; referring to Figure 7 , showing the structure of the photovoltaic module in the embodiment of the utility model Figure 1 ;reference Figure 8 , showing a schematic diagram of the structure of the series connection between two adjacent battery cells in an embodiment of the utility model; referring to Fig. 9 , showing the structure of the photovoltaic module in the embodiment of the utility model Figure 2 ;reference Fig.10 , showing Fig. 9 Schematic diagram of photovoltaic module structure Figure 2 A partial enlarged view of .

[0040] like Figures 1 to 10 As shown, an embodiment of the utility model discloses a photovoltaic module, which includes a cell 10; a first TCO layer 20, the first TCO layer 20 is stacked on the back of the cell 10; a first auxiliary grid 30, the first auxiliary grid 30 is connected to the side of the first TCO layer 20 away from the cell 10; wherein, on the plane where the cell is located, the first TCO layer 20 has a first projection on the cell 10, the area of ​​the first projection is smaller than the area of ​​the cell 10, and the projection of the first auxiliary grid 30 on the cell 10 falls within the first projection.

[0041] like Figures 1 to 10 As shown, the photovoltaic module disclosed in the present invention comprises a cell 10, a first TCO layer 20 and a first secondary grid 30. The cell 10 is a core component of the photovoltaic module, which can convert solar energy into electrical energy.

[0042] It should be noted that the cell 10 in the embodiment of the utility model can be a heterojunction cell, a monocrystalline silicon cell, an amorphous silicon cell, or a polycrystalline silicon cell. In the embodiment of the utility model, there are no excessive restrictions on the specific type of the cell 10. In actual applications, technicians can select a suitable cell 10 as needed.

[0043] like Figures 1 to 10 As shown, along the thickness direction of the cell 10, the cell 10 has a front side and a back side that are arranged opposite to each other. The front side is the light-receiving side of the cell 10, that is, the side irradiated by sunlight. The back side is the backlight side of the cell 10, that is, the surface facing away from sunlight. The first TCO layer 20 is stacked on the back side of the cell 10.

[0044] The first TCO layer 20 has transparent and conductive properties. That is, the first TCO layer 20 is a transparent conductive oxide film, and sunlight can pass through the first TCO layer 20 to reach the surface of the battery cell 10. In addition, the first TCO layer 20 can collect the current generated by the battery cell 10.

[0045] In the embodiment of the utility model, the first TCO layer 20 can be formed on the back of the cell 10 by deposition. The first TCO layer 20 can be an indium tin oxide layer, an indium-doped zinc oxide layer, an aluminum-doped zinc oxide layer, or a fluorine-doped tin oxide layer. In the embodiment of the utility model, there are no excessive restrictions on the specific material of the first TCO layer 20, and in actual applications, technicians can choose according to needs.

[0046] In addition, along the thickness direction of the cell 10, the thickness of the first TCO layer 20 is greater than or equal to 50nm and less than or equal to 180nm. Specifically, the thickness of the first TCO layer 20 can be 50nm, 70nm, 90nm, 110nm, 130nm, 150nm, 170nm, etc.

[0047] like Figures 1 to 10 As shown, the first auxiliary grid 30 is connected to the side of the first TCO layer 20 away from the battery cell 10, and the current collected by the first TCO layer 20 is collected by the first auxiliary grid 30. Specifically, the first auxiliary grid 30 can be set on the side of the first TCO layer 20 away from the battery cell 10 by screen printing, electroplating, laser transfer, 3D printing, coating, etc.

[0048] It should be noted that if Figure 2 As shown, the first auxiliary grid 30 in the embodiment of the utility model includes a plurality of first auxiliary grids 30, and the plurality of first auxiliary grids 30 extend along the first direction A and are arranged at intervals along the second direction B. Wherein, in the case where the cell 10 is a rectangular cell, the first direction A is the length direction of the cell 10, and the second direction B is the width direction of the cell 10. The current collected by the first TCO layer 20 is collected by the plurality of first auxiliary grids 30 to improve the photoelectric conversion efficiency of the photovoltaic module.

[0049] Specifically, the number of the first sub-grids 30 may be set to be greater than or equal to 40 and less than or equal to 160. For example, the number of the first sub-grids 30 is 40, 80, 120, 160, and so on.

[0050] In addition, the width of the first sub-grid 30 in the embodiment of the utility model is greater than or equal to 15 μm and less than or equal to 80 μm. For example, the width of the first sub-grid 30 is 15 μm, 30 μm, 50 μm, 70 μm, 80 μm, etc.

[0051] like Figures 1 to 10 As shown, on the plane where the cell 10 is located, the first TCO layer 20 has a first projection on the cell 10. In the embodiment of the utility model, the area of ​​the first projection is set to be smaller than the area of ​​the cell 10. In other words, the first projection of the first TCO layer 20 falls into the cell 10. This improves the reliability of the cell 10 and avoids the short circuit problem of the cell 10. Further, the projection of the first auxiliary grid 30 on the cell 10 is set to fall into the first projection, so that the first auxiliary grid 30 can be connected to the first TCO layer 20, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0052] The photovoltaic module disclosed in the embodiment of the utility model includes a cell 10, a first TCO layer 20 and a first auxiliary grid 30. The first TCO layer 20 is stacked on the back of the cell 10, and the first auxiliary grid 30 is connected to the side of the first TCO layer 20 away from the cell 10. On the plane where the cell 10 is located, the first TCO layer 20 has a first projection, and the area of ​​the first projection is set to be smaller than the area of ​​the cell 10 to improve the reliability of the cell 10 and avoid the short circuit problem of the cell 10. Furthermore, by setting the projection of the first auxiliary grid 30 on the cell 10 to fall within the first projection, the first auxiliary grid 30 can be connected to the first TCO layer 20, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0053] Alternatively, if Figure 2 and Figure 3 As shown, in the embodiment of the utility model, the first auxiliary grid 30 includes a plurality of first auxiliary grids 30, and the plurality of first auxiliary grids 30 extend along the first direction A and are arranged at intervals along the second direction B, and the second direction B intersects the first direction A. Along the second direction B, the battery cell 10 has a first side surface 11 and a second side surface 12 that are arranged opposite to each other; the distance between the first auxiliary grid 30 closest to the first side surface 11 and the first side surface 11 is L1, and the distance between the surface of the first TCO layer 20 close to the first side surface 11 and the first side surface 11 is L2, wherein L1>L2; the distance between the first auxiliary grid 30 closest to the second side surface 12 and the second side surface 12 is L3, and the distance between the surface of the first TCO layer 20 close to the second side surface 12 and the second side surface 12 is L4, wherein L3>L4.

[0054] like Figure 2 and Figure 3 As shown, the first auxiliary grid 30 in the embodiment of the utility model includes a plurality of first auxiliary grids 30 , which all extend along the first direction A and are arranged at intervals along the second direction B to collect the current generated by the battery cell 10 through the plurality of first auxiliary grids 30 .

[0055] Among them, along the second direction B, the battery cell 10 has a first side surface 11 and a second side surface 12 that are arranged oppositely. It can be understood that, in the case where the battery cell 10 is a rectangular battery cell, the first direction A is the length direction of the battery cell 10, and the second direction B is the width direction of the battery cell 10. Along the width direction of the battery cell 10, the battery cell 10 has a first side surface 11 and a second side surface 12 that are arranged oppositely. The first auxiliary grid 30 extends along the first direction A, that is, the first auxiliary grid 30 extends along the length direction of the battery cell 10.

[0056] In the embodiment of the utility model, the distance L1 between the first grid line 30 closest to the first side surface 11 of the cell 10 and the first side surface 11 is set to be greater than the distance L2 between the surface of the first TCO layer 20 close to the first side surface 11 and the first side surface 11. In this way, the first grid line 30 closest to the first side surface 11 of the cell 10 can be connected to the first TCO layer 20, so as to improve the performance of the photovoltaic module and the photoelectric conversion efficiency of the photovoltaic module.

[0057] Furthermore, the distance L3 between the first auxiliary grid 30 closest to the second side surface 12 of the solar cell 10 and the second side surface 12 is set to be greater than the distance L4 between the surface of the first TCO layer 20 close to the second side surface 12 and the second side surface 12. Thus, the first auxiliary grid 30 closest to the second side surface 12 of the solar cell 10 can be connected to the first TCO layer 20, so as to further improve the performance of the photovoltaic module and the photoelectric conversion efficiency of the photovoltaic module.

[0058] Specifically, Figure 2 and Figure 3 As shown, in the embodiment of the utility model, L1 and L3 are both set to be greater than or equal to 0.7 mm and less than or equal to 1.1 mm; L2 and L4 are both set to be greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0059] like Figure 2 and Figure 3 As shown, in the embodiment of the utility model, the distance L1 between the first auxiliary grid 30 closest to the first side surface 11 of the battery cell 10 and the first side surface 11 and the distance L3 between the first auxiliary grid 30 closest to the second side surface 12 of the battery cell 10 and the second side surface 12 are both set to be greater than or equal to 0.7 mm and less than or equal to 1.1 mm.

[0060] For example, the distance L1 between the first auxiliary grid 30 closest to the first side surface 11 of the battery cell 10 and the first side surface 11 can be set to 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, etc. The distance L3 between the first auxiliary grid 30 closest to the second side surface 12 of the battery cell 10 and the second side surface 12 can also be set to 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, etc.

[0061] like Figure 2 and Figure 3 As shown, in the embodiment of the utility model, the distance L2 between the surface of the first TCO layer 20 close to the first side surface 11 and the first side surface 11 and the distance L4 between the surface of the first TCO layer 20 close to the second side surface 12 and the second side surface 12 are both set to be greater than or equal to 0.3 mm and less than or equal to 0.7 mm. So that the first auxiliary grid 30 closest to the first side surface 11 of the battery cell 10 and the first auxiliary grid 30 closest to the second side surface 12 of the battery cell 10 can be connected to the first TCO layer 20, so as to further improve the performance of the photovoltaic module and improve the photoelectric conversion efficiency of the photovoltaic module.

[0062] For example, the distance L2 between the surface of the first TCO layer 20 close to the first side surface 11 and the first side surface 11 can be set to 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, etc. The distance L4 between the surface of the first TCO layer 20 close to the second side surface 12 and the second side surface 12 can also be set to 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, etc.

[0063] Preferably, the distance L1 between the first auxiliary grid 30 closest to the first side 11 of the cell 10 and the first side 11 and the distance L3 between the first auxiliary grid 30 closest to the second side 12 of the cell 10 and the second side 12 can be set to 0.75 mm, and the distance L2 between the surface of the first TCO layer 20 close to the first side 11 and the first side 11 and the distance L4 between the surface of the first TCO layer 20 close to the second side 12 and the second side 12 can be set to 0.5 mm. In this way, when the first TCO layer 20 is offset, the first auxiliary grid 30 closest to the first side 11 of the cell 10 and the first auxiliary grid 30 closest to the second side 12 of the cell 10 can still overlap the first TCO layer 20, thereby ensuring good contact between the first auxiliary grid 30 and the first TCO layer 20.

[0064] Alternatively, if Figures 1 to 3 As shown, the photovoltaic module in the embodiment of the utility model further includes a second TCO layer 40 and a second auxiliary grid 50, wherein the second TCO layer 40 is stacked on the front side of the battery cell 10, and the second auxiliary grid 50 is connected to the side of the second TCO layer 40 away from the battery cell 10; on the plane where the battery cell 10 is located, the second TCO layer 40 has a second projection on the battery cell 10, and the area of ​​the second projection is equal to the area of ​​the battery cell 10.

[0065] like Figures 1 to 3As shown, the second TCO layer 40 in the embodiment of the present invention is stacked on the front side of the cell 10. That is, the second TCO layer 40 is stacked on the light-receiving side of the cell 10, which is the side irradiated by sunlight.

[0066] The second TCO layer 40 has transparent and conductive properties. That is, the second TCO layer 40 is the same as the first TCO layer 20, and is a transparent conductive oxide film. Sunlight can pass through the second TCO layer 40 and irradiate the surface of the cell 10. In addition, the second TCO layer 40 can also collect the current generated by the cell 10.

[0067] In the embodiment of the utility model, a deposition method can be used to form a second TCO layer 40 on the front side of the cell 10 and a first TCO layer 20 on the back side of the cell 10. During the deposition process, a mask is used to cover part of the back side of the cell 10, while the front side of the cell 10 does not need to be covered.

[0068] The second TCO layer 40 may be an indium tin oxide layer, an indium-doped zinc oxide layer, an aluminum-doped zinc oxide layer, or a fluorine-doped tin oxide layer. In the embodiment of the utility model, there are no excessive restrictions on the specific material of the second TCO layer 40, and in actual applications, technicians can select it according to needs.

[0069] In addition, along the thickness direction of the cell 10, the thickness of the second TCO layer 40 is greater than or equal to 50nm and less than or equal to 180nm. Specifically, the thickness of the second TCO layer 40 can be 50nm, 70nm, 90nm, 110nm, 130nm, 150nm, 170nm, etc.

[0070] like Figures 1 to 3 As shown, the second auxiliary grid 50 is connected to the side of the second TCO layer 40 away from the battery cell 10, so as to collect the current collected by the second TCO layer 40 through the second auxiliary grid 50. Specifically, the second auxiliary grid 50 can be disposed on the side of the second TCO layer 40 away from the battery cell 10 by screen printing, electroplating, laser transfer, 3D printing, coating, etc.

[0071] It should be noted that the second auxiliary grid 50 in the embodiment of the utility model includes a plurality of second auxiliary grids 50, and the plurality of second auxiliary grids 50 extend along the first direction A and are arranged at intervals along the second direction B. Wherein, in the case where the battery cell 10 is a rectangular battery cell, the first direction A is the length direction of the battery cell 10, and the second direction B is the width direction of the battery cell 10. The current collected by the second TCO layer 40 is collected by the plurality of second auxiliary grids 50 to improve the photoelectric conversion efficiency of the photovoltaic module.

[0072] Specifically, the number of the second sub-grids 50 may be set to be greater than or equal to 40 and less than or equal to 160. For example, the number of the second sub-grids 30 is 40, 80, 120, 160, and so on.

[0073] In addition, the width of the second sub-grid 30 in the embodiment of the utility model is greater than or equal to 15 μm and less than or equal to 80 μm. For example, the width of the second sub-grid 30 is 15 μm, 25 μm, 40 μm, 55 μm, 60 μm, 80 μm, etc.

[0074] On the plane where the cell 10 is located, the second TCO layer 40 has a second projection on the cell 10. In the embodiment of the utility model, the area of ​​the second projection is set to be equal to the area of ​​the cell 10. The current generated on the front side of the cell 10 is collected by the second TCO layer 40, thereby further improving the photoelectric conversion efficiency of the photovoltaic module.

[0075] Alternatively, if Figures 4 to 10 As shown, the photovoltaic module in the embodiment of the utility model also includes a plurality of main grids 60, and the plurality of main grids 60 are all connected to the first TCO layer 20 or the second TCO layer 40 on the side away from the battery cell 10; the plurality of main grids 60 extend along the second direction B and are arranged at intervals along the first direction A, wherein the second direction B is perpendicular to the first direction A.

[0076] like Figures 4 to 10 A plurality of busbars 60 are disposed on a side of the first TCO layer 20 or the second TCO layer 40 away from the cell 10. The current collected by the first TCO layer 20 or the second TCO layer 40 is collected by the plurality of busbars 60 to improve the current collection efficiency.

[0077] Specifically, the plurality of main grids 60 may be disposed on a side of the first TCO layer 20 or the second TCO layer 40 away from the battery cell 10 by screen printing, electroplating, laser transfer, 3D printing, coating, or the like.

[0078] In the case where the battery cell 10 is a rectangular battery cell, the length direction of the battery cell 10 is the first direction A, and the width direction of the battery cell 10 is the second direction B. The plurality of main grids 60 extend along the second direction B, and are arranged at intervals along the first direction A. That is, the plurality of main grids 60 extend along the width direction of the battery cell 10, and are arranged at intervals along the length direction of the battery cell 10.

[0079] Alternatively, if Figures 4 to 10As shown, in an embodiment of the utility model, along the first direction A, the battery cell 10 has a third side surface 13 and a fourth side surface 14 arranged opposite to each other, and the distance between two adjacent main grids 60 is equal, both are L5; the distance between the main grid 60 closest to the third side surface 13 of the battery cell 10 and the third side surface 11 is L6, wherein L6>L5; the distance between the main grid 60 closest to the fourth side surface 14 of the battery cell 10 and the fourth side surface 12 is L7, wherein L7>L5.

[0080] like Figures 4 to 10 As shown, along the first direction A, the cell 10 has a third side surface 13 and a fourth side surface 14 arranged opposite to each other. A plurality of main grids 60 are arranged at equal distances on the surface of the cell 10, and the plurality of main grids 60 extend along the second direction B and are arranged at intervals along the first direction A. The distance between two adjacent main grids 60 is L5. The distance L6 between the main grid 60 closest to the third side surface 13 of the cell 10 and the third side surface 13 is set to be greater than the distance L5 between the two adjacent main grids 60, and the distance L7 between the main grid 60 closest to the fourth side surface 14 of the cell 10 and the fourth side surface 14 is set to be greater than the distance L5 between the two adjacent main grids 60. As a result, the main grid 60 closest to another adjacent cell 10 on one cell 10 is spaced larger than the main grid 60 closest to the cell 10 of another adjacent cell 10, thereby reducing the risk of leakage of the photovoltaic module.

[0081] Preferably, if Figure 4 and Figure 5 As shown, the main grid 60 in the embodiment of the present utility model includes 18 bars, L5 is equal to 9.5 mm, and L6 and L7 are equal to 10.35 mm.

[0082] It should be noted that the battery cell 10 in the embodiment of the utility model is a rectangular structure, and the length of the battery cell 10 is 182.2 mm and the width is 95.8 mm. The first direction A is the length direction of the battery cell 10, and the second direction B is the width direction of the battery cell 10.

[0083] like Figures 4 to 5 As shown, the main grid 60 in the embodiment of the utility model includes 18 bars, the distance L5 between two adjacent main grids 60 is 9.5 mm, the distance L6 between the main grid 60 closest to the third side 13 of the cell 10 and the third side 13 is 10.35 mm, and the distance L7 between the main grid 60 closest to the fourth side 14 of the cell 10 and the fourth side 14 is 10.35 mm. Thus, the distance L6 between the main grid 60 closest to the third side 13 of the cell 10 and the third side 13 is increased, and the distance L7 between the main grid 60 closest to the fourth side 14 of the cell 10 and the fourth side 14 is increased, so as to reduce the risk of leakage of the photovoltaic module.

[0084] It should be noted that the above setting of 18 main grids 60, L5 equal to 9.5 mm, L6 and L7 equal to 10.35 mm is only an individual example of the embodiment of the utility model, and is not a limitation of the utility model. In actual applications, technicians can set the number of main grids 60 and the gap between two adjacent main grids 60 as needed.

[0085] Alternatively, if Figures 7 to 10 As shown, the battery cells 10 in the embodiment of the utility model include a plurality of battery cells 10, and the plurality of battery cells 10 are arranged at intervals, and a first gap L8 is provided between two adjacent battery cells 10, wherein L8+L6+L7>2*L5.

[0086] like Figures 7 to 10 As shown, the photovoltaic module generally includes a plurality of cells 10, which are arranged at intervals along a first direction A, and two adjacent cells 10 are connected in series via welding rods. A first gap L8 is formed between two adjacent cells 10.

[0087] The sum of the first gap L8 between two adjacent cells 10, the distance L6 between the main grid 60 closest to the third side 13 of the cell 10 and the third side 13, and the distance L7 between the main grid 60 closest to the fourth side 14 of the cell 10 and the fourth side 14 is greater than twice the distance L5 between two adjacent main grids 60, so as to enhance the reliability of the photovoltaic module and reduce the risk of leakage of the photovoltaic module.

[0088] Optionally, the battery cell 10 in the embodiment of the present invention includes a heterojunction battery cell.

[0089] Since heterojunction cells have the characteristics of high conversion efficiency, low temperature coefficient, no light-induced degradation, low process temperature, etc. Therefore, the cell 10 in the embodiment of the utility model can be a heterojunction cell.

[0090] Of course, the above method of setting the cell 10 as a heterojunction cell is only an individual example of the present invention and is not intended to be a limitation of the present invention. In actual applications, technicians can also select appropriate cells for use in the photovoltaic module disclosed in the present invention as needed.

[0091] The photovoltaic module disclosed in the embodiment of the utility model includes a battery cell, a first TCO layer and a first auxiliary grid, wherein the first TCO layer is stacked on the back of the battery cell, and the first auxiliary grid is connected to the side of the first TCO layer away from the battery cell. On the plane where the battery cell is located, the first TCO layer has a first projection, and the area of ​​the first projection is set to be smaller than the area of ​​the battery cell to improve the reliability of the battery cell and avoid short circuit problems in the battery cell. Furthermore, by setting the projection of the first auxiliary grid on the battery cell to fall within the first projection, so that the first auxiliary grid can be connected to the first TCO layer, the photoelectric conversion efficiency of the photovoltaic module is improved.

[0092] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0093] Although the optional embodiments of the utility model embodiments have been described, those skilled in the art, once knowing the basic creative concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0094] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0095] The technical solution provided by the utility model is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. At the same time, for general technicians in this field, according to the principle and implementation method of the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A photovoltaic module, characterized in that: include: Battery cells; A first TCO layer, wherein the first TCO layer is stacked on the back side of the cell; A first auxiliary grid, wherein the first auxiliary grid is connected to a side of the first TCO layer away from the solar cell; Among them, on the plane where the battery cell is located, the first TCO layer has a first projection on the battery cell, the area of ​​the first projection is smaller than the area of ​​the battery cell, and the projection of the first auxiliary grid on the battery cell falls within the first projection.

2. The photovoltaic module according to claim 1, characterized in that: The first auxiliary grid includes a plurality of strips, the plurality of first auxiliary grids all extend along a first direction and are arranged at intervals along a second direction, and the second direction intersects with the first direction; Along the second direction, the battery cell has a first side surface and a second side surface that are oppositely disposed; The distance between the first secondary gate closest to the first side and the first side is L1, and the distance between the surface of the first TCO layer close to the first side and the first side is L2, wherein L1>L2; The distance between the first sub-gate closest to the second side and the second side is L3, and the distance between the surface of the first TCO layer close to the second side and the second side is L4, wherein L3>L4.

3. The photovoltaic module according to claim 2, characterized in that: Both L1 and L3 are greater than or equal to 0.7 mm and less than or equal to 1.1 mm; Both L2 and L4 are greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

4. The photovoltaic module according to claim 3, characterized in that: The L1 and the L3 are both equal to 0.75 mm, and the L2 and the L4 are both equal to 0.5 mm.

5. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module further includes a second TCO layer and a second auxiliary grid, wherein: The second TCO layer is stacked on the front side of the cell, and the second auxiliary grid is connected to a side of the second TCO layer away from the cell; On the plane where the battery cell is located, the second TCO layer has a second projection on the battery cell, and the area of ​​the second projection is equal to the area of ​​the battery cell.

6. The photovoltaic module according to claim 5, characterized in that: The photovoltaic module further includes a plurality of main grids, wherein the plurality of main grids are all connected to a side of the first TCO layer or the second TCO layer away from the solar cell; The plurality of main grids extend along a second direction and are arranged at intervals along a first direction, wherein the second direction is perpendicular to the first direction.

7. The photovoltaic module according to claim 6, characterized in that: Along the first direction, the cell has a third side surface and a fourth side surface that are arranged opposite to each other, and the distances between two adjacent main grids are equal, both being L5; The distance between the main grid closest to the third side surface and the third side surface is L6, wherein L6>L5; The distance between the main grid closest to the fourth side surface and the fourth side surface is L7, where L7>L5.

8. The photovoltaic module according to claim 7, characterized in that: The battery cell is a rectangular structure, with a length of 182.2 mm and a width of 95.8 mm; The first direction is the length direction of the battery cell, and the second direction is the width direction of the battery cell.

9. The photovoltaic module according to claim 8, characterized in that: The main grid includes 18 bars, L5 is equal to 9.5 mm, and L6 and L7 are equal to 10.35 mm.

10. The photovoltaic module according to claim 6, characterized in that: The battery cells include a plurality of battery cells, which are arranged at intervals, and a first gap L8 is provided between two adjacent battery cells, wherein L8+L6+L7>2*L5.

11. The photovoltaic module according to any one of claims 1 to 10, characterized in that: The battery cell includes a heterojunction battery cell.

Images