A photovoltaic module

Abstract

This application discloses a photovoltaic module, belonging to the field of photovoltaic module technology. The photovoltaic module includes at least two cell bodies arranged along a first direction. Each cell body has a first surface and a second surface disposed opposite to each other. The first surface of each cell body has N sub-regions extending along a second direction and spaced apart along the first direction, with an isolation zone between adjacent sub-regions. The second direction intersects the first direction. A first main grid extends along the first direction and is electrically connected to two adjacent sub-regions within the same cell body. A solder strip extends along the first direction and is electrically connected to adjacent sub-regions of two adjacent cell bodies that are close to each other, thus connecting the two adjacent cell bodies in series.

Description

Technical Field

[0001] This application relates to the field of photovoltaic module technology, specifically to a photovoltaic module. Background Technology

[0002] Photovoltaic modules can convert solar energy into electrical energy. Back-contact photovoltaic modules, as a type of photovoltaic module, have advantages such as high photoelectric conversion efficiency and good appearance.

[0003] In related technologies, photovoltaic modules include multiple solar cells spaced apart along a first direction. One end of a solder strip is connected to the back of one solar cell, and the other end is connected to the back of an adjacent solar cell, so as to connect multiple solar cells in series to form a solar cell string.

[0004] However, the above configuration results in high and concentrated thermal stress on the solar cells, making them prone to warping and other problems, which affects the yield of photovoltaic modules. Utility Model Content

[0005] This application discloses a photovoltaic module to solve, or at least partially solve, the problem in the prior art where the thermal stress of the solar cells is large and concentrated, and the solar cells are prone to warping.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] This application discloses a photovoltaic module, comprising at least two cell bodies arranged along a first direction, each cell body having a first surface and a second surface disposed opposite to each other, the first surface of each cell body having N sub-regions extending along a second direction and spaced apart along the first direction, with an isolation region between adjacent sub-regions, the second direction intersecting the first direction; a first busbar extending along the first direction and electrically connected to two adjacent sub-regions within the same cell body to connect the two adjacent sub-regions in the same cell body in series; and a solder strip extending along the first direction and electrically connected to adjacent sub-regions of two adjacent cell bodies that are close to each other to connect the two adjacent cell bodies in series.

[0008] Optionally, along the first direction, the sub-region closest to the side of the battery cell body among the N sub-regions is the first sub-region, the first sub-region has a first region, the first region extends along the first direction, and the welding strip is electrically connected to the first region.

[0009] Optionally, the resistance of the first main gate is R1, and the resistance of the solder strip is R2, satisfying 0.9*R2≤R1≤1.1*R2.

[0010] Optionally, along the first direction, the length of the first main gate is L1, and the length of the solder strip is L2, satisfying L1 > L2.

[0011] Optionally, the condition 1.1*L2≤L1≤1.3*L2 must be met.

[0012] Optionally, along the first direction, the sub-region closest to the side of the battery cell body among the N sub-regions is the first sub-region. A second main grid is disposed in the first sub-region. The second main grid extends along the first direction. The solder strip covers the second main grid and is electrically connected to the second main grid.

[0013] Optionally, along the first direction, the length of the solder strip is L2, and there is a first interval d between two adjacent battery cell bodies. The length of the battery cell body is L, satisfying L2 < 2L / N + d.

[0014] Optionally, each of the sub-regions is provided with a first fine grid and a second fine grid extending along the second direction and arranged alternately along the first direction, and the first main grid is electrically connected to the first fine grid; along the first direction, the sub-region closest to the side of the battery cell body among the N sub-regions is the first sub-region, along the first direction, the distance between the second fine grid closest to the side of the battery cell body in the first sub-region and the corresponding edge of the battery cell body is x, and the distance between the second fine grids closest to the two edges of the first sub-region in the first sub-region is m, satisfying L2≥2m+2x+d.

[0015] Optionally, along the first direction, the length of the first main grid is L1, and the length of the battery cell body is L, satisfying L / N < L1 < 2L / N.

[0016] Optionally, along the first direction, the length of the solder strip covering the sub-region is L3, and the length of the first main gate is L1, satisfying L1 > 2L3.

[0017] Optionally, each sub-region is provided with a first fine grid and a second fine grid extending along the second direction and arranged alternately along the first direction, the first main grid being electrically connected to the first fine grid; the second fine grid includes a plurality of second sub-fine grids extending along the second direction and arranged at intervals along the second direction, with a second gap between two adjacent second sub-fine grids, and the first main grid passing through the second gap.

[0018] Optionally, along the second direction, the width of the second gap is greater than the width of the first main gate.

[0019] Optionally, each sub-region is provided with a first fine grid and a second fine grid extending along the second direction and arranged alternately along the first direction, the first main grid being electrically connected to the first fine grid; a second insulating block is provided between the first main grid and the second fine grid.

[0020] Optionally, along the first direction, the sub-region closest to the side of the battery cell body among the N sub-regions is the first sub-region, and the first sub-region has a first side and a second side disposed opposite to each other along the first direction; a first end line is disposed in the first sub-region near the first side and / or the second side, and the welding strip is electrically connected to the first end line.

[0021] Optionally, the first sub-region is provided with a first fine grid and a second fine grid extending along the second direction and arranged alternately along the first direction; the first end wire is electrically connected to a plurality of second fine grids near the first side or the second side.

[0022] Optionally, the sub-region has a third side and a fourth side disposed opposite to each other along the first direction, and a second end line is disposed near the third side and / or the fourth side of the sub-region, and the first main gate is electrically connected to the second end line.

[0023] Optionally, along the first direction, the second end line in one of the sub-regions, the second end line in the next adjacent sub-region, and the first main gate are collinear.

[0024] This application discloses a photovoltaic module, comprising at least two cell bodies arranged along a first direction, each cell body having a first surface and a second surface disposed opposite to each other, the first surface of each cell body having N sub-regions extending along a second direction and spaced apart along the first direction, with an isolation region between adjacent sub-regions, the second direction intersecting the first direction; a first busbar extending along the first direction and electrically connected to two adjacent sub-regions within the same cell body to connect the two adjacent sub-regions in the same cell body in series; and a solder strip extending along the first direction and electrically connected to adjacent sub-regions of two adjacent cell bodies that are close to each other to connect the two adjacent cell bodies in series.

[0025] The photovoltaic module disclosed in this application includes at least two cell bodies spaced apart along a first direction. Each cell body has N sub-regions extending along a second direction and spaced apart along the first direction on its first surface, with an isolation zone between adjacent sub-regions. Two adjacent sub-regions within the same cell body are electrically connected via a first main grid to connect them in series. Sub-regions of two adjacent cell bodies that are close to each other are electrically connected via solder strips to connect them in series. This arrangement divides the cell body into N sub-regions, reducing the extension length of the solder strip along the first direction and lowering the material cost of the solder strip. Furthermore, it reduces the contact area between the solder strip and the cell body, effectively reducing warping of the cell body due to the difference in thermal expansion coefficients between different materials during high-temperature welding. This difference in ΔL (thermal expansion elongation of copper strip > thermal expansion elongation of silicon wafer) at high temperatures leads to metal contraction upon cooling.

[0026] Furthermore, by replacing the solder ribbon with a first main busbar, two adjacent sub-regions within the same solar cell are connected in series. The first main busbar can be formed by screen printing and sintering with silver paste, a process that is less prone to causing warping of the solar cell. In other words, using a first main busbar instead of solder ribbon further reduces the contact area between the solder ribbon and the solar cell, thereby reducing the thermal stress on the solar cell, preventing warping and other problems, and improving the manufacturing yield of photovoltaic modules.

[0027] Furthermore, the above arrangement can also prevent the ends of two solder strips arranged opposite each other along the first direction from being connected together, which could cause a short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module. Attached Figure Description

[0028] Figure 1 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 1 ;

[0029] Figure 2 This diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 2 ;

[0030] Figure 3 This diagram illustrates the structure of the photovoltaic module described in another embodiment of this application. Figure 1 ;

[0031] Figure 4 This diagram illustrates the structure of the photovoltaic module described in another embodiment of this application. Figure 2 ;

[0032] Figure 5 This diagram illustrates the structure of the photovoltaic module described in yet another embodiment of this application. Figure 1 ;

[0033] Figure 6 This diagram illustrates the structure of the photovoltaic module described in yet another embodiment of this application. Figure 2 .

[0034] Figure label:

[0035] 10: Cell body; 11: Sub-region; 111: First sub-region; 12: Isolation region; 13: First grid; 14: Second grid; 141: Second sub-grid;

[0036] 20: First main gate;

[0037] 30: Welding strip;

[0038] 40: First end line;

[0039] 50: Second end line;

[0040] 60: Second insulating block;

[0041] 70: Second main gate;

[0042] X: First direction; Y: Second direction. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of the present utility model.

[0044] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0045] Reference Figure 1 The diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 1 ;reference Figure 2 The diagram illustrates the structure of the photovoltaic module described in the embodiments of this application. Figure 2 ;reference Figure 3 This illustrates a schematic diagram of the structure of a photovoltaic module according to another embodiment of this application. Figure 1 ;reference Figure 4 This illustrates a schematic diagram of the structure of a photovoltaic module according to another embodiment of this application. Figure 2 ;reference Figure 5 This illustrates a schematic diagram of the structure of a photovoltaic module according to yet another embodiment of this application. Figure 1 ;reference Figure 6 This illustrates a schematic diagram of the structure of a photovoltaic module according to yet another embodiment of this application. Figure 2 .

[0046] like Figures 1 to 6 As shown in the embodiment of this application, a photovoltaic module is disclosed. The photovoltaic module includes at least two cell bodies 10, which are arranged along a first direction X. Each cell body 10 has a first surface and a second surface disposed opposite to each other. The first surface of the cell body 10 has N sub-regions 11 extending along a second direction Y and spaced apart along the first direction X. An isolation region 12 is provided between two adjacent sub-regions 11. The second direction Y intersects the first direction X. A first main grid 20 extends along the first direction X and is electrically connected to two adjacent sub-regions 11 in the same cell body 10 to connect the two adjacent sub-regions 11 in the same cell body 10 in series. A solder ribbon 30 extends along the first direction X and is electrically connected to the adjacent sub-regions 11 of the two adjacent cell bodies 10 that are close to each other to connect the two adjacent cell bodies 10 in series.

[0047] This application discloses a photovoltaic module, which is a back-contact photovoltaic module. Back-contact photovoltaic modules have the advantages of high photoelectric conversion efficiency and aesthetically pleasing appearance.

[0048] On the plane containing the cell body 10, the photovoltaic module has intersecting first direction X and second direction Y. For example, the first direction X is the length direction of the cell body 10, and the second direction Y is the width direction of the cell body 10. Alternatively, the first direction X is the width direction of the cell body 10, and the second direction Y is the length direction of the cell body 10.

[0049] The following description will use the first direction X as the width direction of the battery cell body 10 and the second direction Y as the length direction of the battery cell body 10 as an example to illustrate this application.

[0050] like Figures 1 to 6 As shown, the photovoltaic module disclosed in this application includes at least two cell bodies 10, a first main busbar 20, and a solder strip 30. The cell body 10 is the core component of the photovoltaic module, which converts solar energy into electrical energy. At least two cell bodies 10 are arranged along a first direction X. Exemplarily, at least two cell bodies 10 are arranged at intervals along the first direction X. Alternatively, at least two cell bodies 10 are arranged sequentially along the first direction X, with a portion of one cell body 10 pressing onto the other cell body 10 in adjacent cell bodies 10.

[0051] Along the thickness direction of the photovoltaic module, the cell body 10 has a first surface and a second surface disposed opposite to each other. When the first surface is the light-receiving surface of the cell body 10, that is, the side facing the sunlight, the second surface is the back-lighting surface of the cell body 10, that is, the side facing away from the sunlight. When the first surface is the back-lighting surface of the cell body 10, the second surface is the light-receiving surface of the cell body 10.

[0052] The following description will use the example of the first surface being the backlight surface of the battery cell body 10 and the second surface being the light-receiving surface of the battery cell body 10 to illustrate this application.

[0053] like Figures 1 to 6 As shown, the first surface of the solar cell body 10 is provided with N sub-regions 11 extending along the second direction Y and spaced apart along the first direction X, with a gap 12 between adjacent sub-regions 11. Two adjacent sub-regions 11 of the same solar cell body 10 are electrically connected via a first main grid 20 to connect two adjacent sub-regions 11 within the same solar cell body 10 in series. Two adjacent sub-regions 11 of adjacent solar cell bodies 10 that are close to each other are electrically connected via solder ribbons 30 to connect two adjacent solar cell bodies 10 in series.

[0054] It should be noted that, in this embodiment, the first main grid 20 can be formed on the first surface of the battery cell body 10 by screen printing. Of course, in this embodiment, there are no excessive restrictions on the specific formation method of the first main grid 20. In practical applications, those skilled in the art can set it as needed.

[0055] Among them, such as Figure 1 and Figure 2 As shown, the first surface of the battery cell body 10 can be provided with two sub-regions 11 extending along the second direction Y and spaced apart along the first direction X, such as... Figure 3 and Figure 4 As shown, the first surface of the battery cell body 10 can be provided with three sub-regions 11 extending along the second direction Y and spaced apart along the first direction X, such as... Figure 5 and Figure 6 As shown, the first surface of the battery cell body 10 may be provided with four sub-regions 11 that extend along the second direction Y and are spaced apart along the first direction X.

[0056] Of course, in this embodiment, the specific number of sub-regions 11 provided on the first surface of the battery cell body 10 is not limited. In practical applications, technicians can set the number as needed.

[0057] In this embodiment, two adjacent sub-regions 11 of the same cell body 10 are electrically connected via the first main grid 20 to connect the two adjacent sub-regions 11 within the same cell body 10 in series. Adjacent sub-regions 11 of two adjacent cell bodies 10 are electrically connected via solder ribbons 30 to connect the two adjacent cell bodies 10 in series. Dividing the cell body 10 into N sub-regions 11 reduces the extension length of the solder ribbons 30 along the first direction X, thus reducing the material cost of the solder ribbons 30. Furthermore, it reduces the contact area between the solder ribbons 30 and the cell body 10, effectively reducing the warping of the cell body 10 due to the difference in thermal expansion coefficients between different materials during high-temperature welding. This difference in ΔL (thermal expansion elongation of copper strip > thermal expansion elongation of silicon wafer) at high temperatures leads to metal contraction upon cooling.

[0058] Furthermore, the first main busbar 20 replaces the solder ribbon 30 to connect two adjacent sub-regions 11 within the same cell body 10 in series. The first main busbar 20 can be formed by screen printing and sintering with silver paste, a process that is less prone to warping of the cell body 10. In other words, using the first main busbar 20 to replace the solder ribbon 30 further reduces the contact area between the solder ribbon 30 and the cell body 10, thereby reducing the thermal stress on the cell body 10, avoiding warping and other problems, and improving the process yield of photovoltaic modules.

[0059] Furthermore, the above arrangement can also prevent the ends of the two solder strips 30 that are positioned opposite each other along the first direction X from being connected together, which could cause a short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0060] In some embodiments, along the first direction X, the sub-region 11 closest to the side of the battery cell body 10 among the N sub-regions 11 is the first sub-region 111. The first sub-region 111 has a first region that extends along the first direction X, and the solder strip 30 is electrically connected to the first region.

[0061] In this embodiment, the solder ribbon 30 is electrically connected to the first region of the first sub-region 111. This can prevent the solder ribbon 30 from extending too far along the first direction X, which would cause the solder ribbon 30 to conduct with the first main grid 20 in the adjacent sub-region 11, resulting in a local short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0062] In some embodiments, the resistance of the first main gate 20 is R1, and the resistance of the solder strip 30 is R2, satisfying 0.9*R2≤R1≤1.1*R2.

[0063] In this embodiment of the application, the resistance of the first main gate 20 is R1, the resistivity of the material of the first main gate 20 is ρ1, the extension length of the first main gate 20 along the first direction X is L1, and the cross-sectional area of ​​the first main gate 20 is S1, wherein R1=ρ1*(L1 / S1).

[0064] In this embodiment, the resistance of the solder ribbon 30 is R1, the resistivity of the solder ribbon 30 material is ρ2, the extension length of the solder ribbon 30 along the first direction X is L2, and the cross-sectional area of ​​the first main gate 20 is S2, where R2=ρ2*(L2 / S2).

[0065] Taking the first main gate 20 as an example of a silver main gate and the solder strip 30 as an example of a copper solder strip, the resistivity ρ1 of the first main gate 20 is the resistivity of silver. The resistivity ρ2 of the solder strip 30 is the resistivity of copper. Of course, the above are only individual examples of the specific materials of the first main gate 20 and the solder strip 30, and are not intended to limit this application.

[0066] In this embodiment, the resistance R1 of the first main gate 20 is set to be greater than or equal to 0.9 times the resistance R2 of the solder ribbon 30, and less than or equal to 1.1 times the resistance R2 of the solder ribbon 30. This makes the resistance R1 of the first main gate 20 and the resistance R2 of the solder ribbon 30 comparable, thereby making the carrier collection efficiency of the first main gate 20 and the solder ribbon 30 comparable, thus ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0067] For example, the following conditions are met: R1 = 0.9R2, R1 = 0.95R2, R1 = R2, R1 = 1.05R2, R1 = 1.1R2, etc.

[0068] In some embodiments, along the first direction X, the length of the first main gate 20 is L1, and the length of the solder strip 30 is L2, satisfying L1 > L2.

[0069] In this embodiment, along the first direction X, the length L1 of the first main grid 20 is set to be greater than the length L2 of the solder strip 30, so that the extension length of the first main grid 20 along the first direction X is greater than the extension length of the solder strip 30. The first main grid 20 collects charge carriers generated at the edge of the cell body 10, thereby improving the charge carrier collection efficiency and the photoelectric conversion efficiency of the photovoltaic module.

[0070] In some embodiments, 1.1*L2≤L1≤1.3*L2 is satisfied.

[0071] In an example, L1 = 1.1L2, or L1 = 1.15L2, or L1 = 1.2L2, or L1 = 1.25L2, or L1 = 1.3L2.

[0072] If the extension length L1 of the first main busbar 20 along the first direction X is less than 1.1 times the extension length L2 of the solder strip 30 along the first direction X, the first main busbar 20 will have difficulty collecting carriers generated in the edge region of the cell body 10. If the extension length L1 of the first main busbar 20 along the first direction X is greater than 1.3 times the extension length L2 of the solder strip 30 along the first direction X, the first main busbar 20 will easily conduct with other main busbars or solder strips of opposite polarity, resulting in a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0073] In some embodiments, along the first direction X, the sub-region 11 closest to the side of the cell body 10 among the N sub-regions 11 is the first sub-region 111. A second main grid 70 is disposed in the first sub-region 111. The second main grid 70 extends along the first direction X. The solder strip 30 covers the second main grid 70 and is electrically connected to the second main grid 70.

[0074] In this embodiment, each sub-region 11 of the battery cell body 10 is provided with a first fine grid 13 and a second fine grid 14 extending along the second direction Y and arranged alternately along the first direction X, so as to collect the charge carriers generated in each sub-region 11 through the first fine grid 13 and the second fine grid 14. The first fine grid 13 and the second fine grid 14 have opposite polarities.

[0075] In this embodiment of the application, a second main gate 70 is provided in the first sub-region 111. The second main gate 70 extends along the first direction X and is electrically connected to the second fine gate 14 so as to collect the carriers collected by the second fine gate 14 through the second main gate 70 and transmit the collected carriers to the external circuit.

[0076] The solder ribbon 30 extends along the first direction X and covers the second main grid 70, and is electrically connected to the second main grid 70. This allows the solder ribbon 30 to collect the charge carriers gathered by the second main grid 70 and transmit the collected charge carriers to an external circuit. The arrangement of the second main grid 70 improves the reliability of charge carrier transmission from the second fine grid 14 to the solder ribbon 30, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0077] In some embodiments, along the first direction X, the length of the solder strip 30 is L2, there is a first interval d between two adjacent battery cell bodies 10, and the length of the battery cell body 10 is L, satisfying L2 < 2L / N + d.

[0078] In this embodiment, along the first direction X, the length L2 of the solder ribbon 30 is set to be less than twice the length L of the cell body 10 divided by N plus the first interval d between two adjacent cell bodies 10. This is to avoid the solder ribbon 30 extending too long along the first direction X, which could cause the solder ribbon 30 to be electrically connected to other main grids with opposite polarity, resulting in a partial short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0079] In some embodiments, each sub-region 11 is provided with a first fine grid 13 and a second fine grid 14 extending along the second direction Y and arranged alternately along the first direction X. The first main grid 20 is electrically connected to the first fine grid 13. Along the first direction X, the sub-region 11 closest to the side of the battery cell body 10 among the N sub-regions 11 is the first sub-region 111. Along the first direction X, the distance between the second fine grid 14 closest to the side of the battery cell body 10 in the first sub-region 111 and the corresponding edge of the battery cell body 10 is x. The distance between the second fine grid 14 closest to the two edges of the first sub-region 111 is m, satisfying L2≥2m+2x+d.

[0080] In this embodiment, each sub-region 11 of the battery cell body 10 is provided with a first fine grid 13 and a second fine grid 14 extending along the second direction Y and arranged alternately along the first direction X, so as to collect the charge carriers generated in each sub-region 11 through the first fine grid 13 and the second fine grid 14. The first fine grid 13 and the second fine grid 14 have opposite polarities.

[0081] In this embodiment, the first main gate 20 is electrically connected to the first fine gate 13 so as to collect the carriers collected by the first fine gate 13 through the first main gate 20 and transmit the collected carriers to the external circuit.

[0082] In this configuration, along the first direction X, the distance between the second fine grid 14 closest to the side of the cell body 10 within the first sub-region 111 and the corresponding edge of the cell body 10 is x, and the distance between the two second fine grids 14 closest to the two edges of the first sub-region 111 is m, satisfying L2≥2m+2x+d. That is, along the first direction X, the solder ribbon 30 can connect to all the second fine grids 14 in two adjacent first sub-regions 111 within two adjacent cell bodies 10, thereby allowing the solder ribbon 30 to collect the charge carriers gathered by all the second fine grids 14, ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0083] In some embodiments, along the first direction X, the length of the first main grid 20 is L1, and the length of the battery cell body 10 is L, satisfying L / N < L1 < 2L / N.

[0084] In this embodiment of the application, along the first direction X, the length L1 of the first main grid 20 is set to be greater than the length L of the cell body 10 divided by N, so as to ensure that the first main grid 20 can collect the charge carriers collected by the first fine grid 13 in at least one sub-region 11, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0085] Furthermore, along the first direction X, the length L1 of the first main grid 20 is set to be less than twice the length L of the cell body 10 divided by N, so that the first main grid 20 can collect the charge carriers collected by the first fine grid 13 in at most two adjacent sub-regions 11. This avoids the first main grid 20 extending too far, which could cause the first main grid 20 to conduct with other non-standard main grids, resulting in a local short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0086] In some embodiments, along the first direction X, the length of the sub-region 11 covered by the solder strip 30 is L3, and the length of the first main gate 20 is L1, satisfying L1 > 2L3.

[0087] In this embodiment, along the first direction X, the length L1 of the first main gate 20 is set to be greater than twice the length L3 of the sub-region 11 covered by the solder ribbon 30. This ensures that the first main gate 20 is long enough along the first direction X to collect all the charge carriers collected by the first fine gate 13 in two adjacent sub-regions 11 and transmit the collected charge carriers to the external circuit, thereby ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0088] It can also be understood that the width of the first sub-region 111 along the first direction X is smaller than the extension width of other sub-regions 11 along the first direction X, which helps to further reduce the length of the solder ribbon 30, reduce the contact area between the solder ribbon 30 and the cell body 10, thereby reducing the thermal stress of the cell body 10, avoiding problems such as warping of the cell body 10, and improving the process yield of photovoltaic modules.

[0089] In some embodiments, each sub-region 11 is provided with a first fine grid 13 and a second fine grid 14 extending along the second direction Y and arranged alternately along the first direction X. The first main grid 20 is electrically connected to the first fine grid 13. The second fine grid 14 includes a plurality of second sub-fine grids 141 extending along the second direction Y and arranged at intervals along the second direction Y. There is a second gap between two adjacent second sub-fine grids 141, and the first main grid 20 passes through the second gap.

[0090] In this embodiment, the second fine grid 14 includes a plurality of second sub-fine grids 141 extending along the second direction Y and spaced apart along the second direction Y, with a second gap between adjacent second sub-fine grids 141. The first main grid 20 passes through the second gap to prevent the first main grid 20 from being connected to the second fine grid 14, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0091] In some embodiments, along the second direction Y, the width of the second gap is greater than the width of the first main gate 20.

[0092] In this embodiment, the width of the second gap along the second direction Y is set to be greater than the width of the first main grid 20, so that the second gap can better avoid the first main grid 20. This prevents the first main grid 20 from being connected to the second fine grid 14, which could lead to a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0093] In some embodiments, each sub-region 11 is provided with a first fine grid 13 and a second fine grid 14 extending along the second direction Y and arranged alternately along the first direction X, a first main grid 20 is electrically connected to the first fine grid 13, and a second insulating block 60 is provided between the first main grid 20 and the second fine grid 14.

[0094] In this embodiment of the application, a second insulating block 60 may also be provided between the first main grid 20 and the second fine grid 14 to block the first main grid 20 and the second fine grid 14, so as to avoid the first main grid 20 and the second fine grid 14 from being connected, which would cause a partial short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0095] The second insulating block 60 is insulating. For example, the second insulating block 60 can be an EVA film (ethylene-vinyl acetate copolymer film) or a POE film (polyolefin elastomer film). Of course, the above are merely individual examples of the specific materials of the second insulating block 60 and are not intended to limit this application. In practical applications, those skilled in the art can set the specific material of the second insulating block 60 as needed. In some embodiments, along the first direction X, the sub-region 11 closest to the side of the battery cell body 10 among the N sub-regions 11 is the first sub-region 111. The first sub-region 111 has a first side and a second side disposed opposite to each other along the first direction X; a first end line 40 is disposed near the first side and / or the second side of the first sub-region 111, and the solder strip 30 is electrically connected to the first end line 40.

[0096] In this embodiment, along the first direction X, the first sub-region 111 has a first side and a second side disposed opposite to each other. A first end line 40 is disposed within the first sub-region 111 near the first side. The first end line 40 extends along the first direction X and is electrically connected to a plurality of second fine gates 14 to collect the charge carriers collected by the plurality of second fine gates 14 through the first end line 40. A solder strip 30 is electrically connected to the first end line 40 to collect the charge carriers collected by the first end line 40 through the solder strip 30.

[0097] And / or, in this embodiment of the application, a first end line 40 is provided in the first sub-region 111 near the second side. The first end line 40 extends along the first direction X and is electrically connected to a plurality of second fine gates 14 to collect the charge carriers collected by the plurality of second fine gates 14 through the first end line 40. A solder strip 30 is electrically connected to the first end line 40 to collect the charge carriers collected by the first end line 40 through the solder strip 30.

[0098] The provision of the first end line 40 in this embodiment can improve the carrier collection efficiency at the position of the first sub-region 111 near the first side and / or the second side, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0099] In some embodiments, a first fine grid 13 and a second fine grid 14 extending along the second direction Y and arranged alternately along the first direction X are provided in the first sub-region 111; the first end line 40 is electrically connected to a plurality of second fine grids 14 near the first side or the second side.

[0100] In this embodiment, a first terminal line 40 is electrically connected to a plurality of second fine gates 14 near the first side or the second side of the first sub-region 111. This allows the first terminal line 40 to collect the charge carriers gathered by the plurality of second fine gates 14 and transmit the collected charge carriers to an external circuit. This improves the charge carrier collection efficiency near the first side or the second side of the first sub-region 111, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0101] In some embodiments, sub-region 11 has a third side and a fourth side disposed opposite to each other along a first direction X, and a second end line 50 is disposed near the third side and / or the fourth side of sub-region 11, and the first main gate 20 is electrically connected to the second end line 50.

[0102] In this embodiment, along the first direction X, sub-region 11 has a third side and a fourth side disposed opposite to each other. A second end line 50 is disposed near the third side within sub-region 11. The second end line 50 extends along the first direction X and is electrically connected to multiple first fine gates 13 to collect the charge carriers collected by the multiple first fine gates 13. A first main gate 20 is electrically connected to the second end line 50 to collect the charge carriers collected by the second end line 50 and transmit the collected charge carriers to an external circuit.

[0103] And / or, in this embodiment of the application, a second terminal line 50 is provided in the sub-region 11 near the fourth side. The second terminal line 50 extends along the first direction X and is electrically connected to multiple first fine gates 13 to collect the carriers collected by the multiple first fine gates 13 through the second terminal line 50. The first main gate 20 is electrically connected to the second terminal line 50 to collect the carriers collected by the second terminal line 50 through the first main gate 20 and transmit the collected carriers to an external circuit.

[0104] The provision of the second end line 50 in this embodiment can improve the carrier collection efficiency near the third and / or fourth side of the sub-region 11, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0105] In some embodiments, along the first direction X, the second end line 50 in a sub-region 11, the second end line 50 in the adjacent next sub-region 11, and the first main gate 20 are collinear.

[0106] In this embodiment, the second end line 50 in a sub-region 11 and the second end line 50 in the adjacent next sub-region 11 are collinear along the first direction X. The first main gate 20 extends along the first direction X and covers the second end line 50 in a sub-region 11 and the second end line 50 in the adjacent next sub-region 11, so as to collect the carriers collected by the two second end lines 50 through the first main gate 20 and transmit the collected carriers to the external circuit to improve the photoelectric conversion efficiency of the photovoltaic module.

[0107] It can be understood that, along the first direction X, the second end line 50 in a sub-region 11, the second end line 50 in the adjacent next sub-region 11, and the first main grid 20 are collinear, so that the first main grid 20 can cover the second end line 50 in a sub-region 11 and the second end line 50 in the adjacent next sub-region 11.

[0108] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0109] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the present invention.

[0110] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0111] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A photovoltaic module, characterized by, include: At least two battery cell bodies (10) are arranged along a first direction (X). Each battery cell body (10) has a first surface and a second surface disposed opposite to each other. The first surface of each battery cell body (10) has N sub-regions (11) extending along a second direction (Y) and spaced apart along the first direction (X). An isolation region (12) is provided between two adjacent sub-regions (11). The second direction (Y) intersects the first direction (X). The first main grid (20) extends along the first direction (X) and is electrically connected to two adjacent sub-regions (11) in the same cell body (10) to connect the two adjacent sub-regions (11) in the same cell body (10) in series. A solder strip (30) extends along the first direction (X) and is electrically connected to the sub-regions (11) of two adjacent cell bodies (10) that are close to each other, so as to connect the two adjacent cell bodies (10) in series.

2. The photovoltaic module of claim 1, wherein, Along the first direction (X), the sub-region (11) closest to the side of the battery cell body (10) among the N sub-regions (11) is the first sub-region (111). The first sub-region (111) has a first region that extends along the first direction (X), and the solder strip (30) is electrically connected to the first region.

3. The photovoltaic module of claim 2, wherein, The resistance of the first main gate (20) is R1, and the resistance of the solder strip (30) is R2, satisfying 0.9*R2≤R1≤1.1*R2.

4. The photovoltaic module of claim 2, wherein, Along the first direction (X), the length of the first main gate (20) is L1, and the length of the solder strip (30) is L2, satisfying L1 > L2.

5. The photovoltaic module of claim 4, wherein, It satisfies 1.1*L2≤L1≤1.3*L2.

6. The photovoltaic module of claim 1, wherein, Along the first direction (X), the sub-region (11) closest to the side of the battery cell body (10) among the N sub-regions (11) is the first sub-region (111). A second main gate (70) is provided in the first sub-region (111). The second main gate (70) extends along the first direction (X). The solder strip (30) covers the second main gate (70) and is electrically connected to the second main gate (70).

7. The photovoltaic module of claim 1, wherein, Along the first direction (X), the length of the solder strip (30) is L2, and there is a first interval d between two adjacent battery cell bodies (10). The length of the battery cell body (10) is L, satisfying L2 < 2L / N + d.

8. The photovoltaic module of claim 7, wherein, Each of the sub-regions (11) is provided with a first fine grid (13) and a second fine grid (14) extending along the second direction (Y) and arranged alternately along the first direction (X). The first main grid (20) is electrically connected to the first fine grid (13). Along the first direction (X), the sub-region (11) closest to the side of the battery cell body (10) among the N sub-regions (11) is the first sub-region (111). Along the first direction (X), the distance between the second fine grid (14) closest to the side of the battery cell body (10) in the first sub-region (111) and the corresponding edge of the battery cell body (10) is x, and the distance between the second fine grid (14) closest to the two edges of the first sub-region (111) in the first sub-region (111) is m, satisfying L2≥2m+2x+d.

9. The photovoltaic module of claim 1, wherein, Along the first direction (X), the length of the first main grid (20) is L1, and the length of the battery cell body (10) is L, satisfying L / N < L1 < 2L / N.

10. The photovoltaic module of claim 1, wherein, Along the first direction (X), the length of the solder strip (30) covering the sub-region (11) is L3, and the length of the first main gate (20) is L1, satisfying L1 > 2L3.

11. The photovoltaic module of claim 1, wherein, Each of the sub-regions (11) is provided with a first fine grid (13) and a second fine grid (14) extending along the second direction (Y) and arranged alternately along the first direction (X), and the first main grid (20) is electrically connected to the first fine grid (13); The second fine gate (14) includes a plurality of second sub-fine gates (141) extending along the second direction (Y) and spaced apart along the second direction (Y), with a second gap between two adjacent second sub-fine gates (141), and the first main gate (20) passing through the second gap.

12. The photovoltaic module of claim 11, wherein, Along the second direction (Y), the width of the second gap is greater than the width of the first main gate (20).

13. The photovoltaic module of claim 8, wherein, Each of the sub-regions (11) is provided with a first fine grid (13) and a second fine grid (14) extending along the second direction (Y) and arranged alternately along the first direction (X), and the first main grid (20) is electrically connected to the first fine grid (13); A second insulating block (60) is provided between the first main grid (20) and the second fine grid (14).

14. The photovoltaic module of claim 1, wherein, Along the first direction (X), the sub-region (11) closest to the side of the battery cell body (10) among the N sub-regions (11) is the first sub-region (111), and the first sub-region (111) has a first side and a second side arranged opposite to each other along the first direction (X); The first sub-region (111) is provided with a first end line (40) near the first side and / or the second side, and the solder strip (30) is electrically connected to the first end line (40).

15. The photovoltaic module of claim 14, wherein, The first sub-region (111) is provided with a first fine grid (13) and a second fine grid (14) extending along the second direction (Y) and arranged alternately along the first direction (X); The first end line (40) is electrically connected to a plurality of second fine grids (14) near the first side or the second side.

16. The photovoltaic module of claim 1, wherein, The sub-region (11) has a third side and a fourth side that are arranged opposite to each other along the first direction (X). A second end line (50) is provided in the sub-region (11) near the third side and / or the fourth side. The first main gate (20) is electrically connected to the second end line (50).

17. The photovoltaic module of claim 16, wherein, Along the first direction (X), the second end line (50) in one of the sub-regions (11), the second end line (50) in the next adjacent sub-region (11), and the first main gate (20) are collinear.

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