Solar cell and photovoltaic module

Abstract

The utility model discloses a solar cell and a photovoltaic assembly, and belongs to the technical field of photovoltaic assemblies. The solar cell comprises a cell body, a main grid and a plurality of fine grids, the main grid and the fine grids are arranged on the surface of the cell body, the fine grids extend along a first direction and are arranged at intervals along a second direction, and the second direction intersects with the first direction; and the main grid extends along the second direction, the main grid is provided with a bending section, the bending section is connected to the plurality of fine grids, and the bending section passes through the passivation layer on the surface of the battery piece body so as to collect current generated by the battery piece body.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a solar cell and a photovoltaic assembly. Background Art

[0002] Solar cells are the core components of photovoltaic modules, which can convert solar energy into electrical energy. The surface of the solar cell is provided with positive and negative grid lines to collect the current generated by the solar cell through the positive and negative grid lines.

[0003] For example, Figure 1 As shown, a back-contact solar cell is a type of solar cell, which means that the positive and negative grid lines of the cell are both arranged on the back of the cell to reduce the shading of the positive or negative grid lines on the front of the cell, thereby improving the photoelectric conversion efficiency of the cell. The positive and negative grid lines of the back-contact solar cell are in a finger-shaped pattern and are printed on the back of the cell. Specifically, the negative grid lines and the positive grid lines both include a plurality of fine grids extending in a first direction and arranged at intervals in a second direction, and the current generated by the cell is collected by the plurality of fine grids. The main grid is extended in the second direction and connected to the plurality of fine grids, so that the current collected by the plurality of fine grids is collected by the main grid.

[0004] However, the main grid of the existing solar cell can only collect the current collected by the fine grid, and cannot collect the current generated by the cell. Utility Model Content

[0005] The utility model discloses a solar cell and a photovoltaic module, which solve or at least partially solve the problem in the prior art that the main grid of the existing solar cell can only collect the current collected by the fine grid but cannot collect the current generated by the cell.

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

[0007] In a first aspect, the utility model discloses a solar cell, comprising: a cell body and a main grid and a plurality of fine grids arranged on the surface of the cell body, wherein the plurality of fine grids extend along a first direction and are arranged at intervals along a second direction, and the second direction intersects with the first direction; the main grid extends along the second direction, the main grid has a bending section, the bending section is connected to the plurality of fine grids, and the bending section passes through a passivation layer on the surface of the cell body to collect the current generated by the cell body.

[0008] Optionally, the fine grid is a negative electrode fine grid, and the main grid is a negative electrode main grid; and / or, the fine grid is a positive electrode fine grid, and the main grid is a positive electrode main grid.

[0009] Optionally, the bending segments include a plurality of bending segments, the plurality of bending segments are arranged along the second direction, and one bending segment is connected to another adjacent bending segment.

[0010] Optionally, along the first direction, the bending section has a first center line; and a connection between the bending section and the fine grid is located on the first center line.

[0011] Optionally, the solar cell further comprises a buffer portion, wherein the buffer portion is arranged at a connection between the bending section and the fine grid, and a length of the buffer portion in the second direction is greater than a length of the fine grid in the second direction.

[0012] Optionally, the bending section includes a first connecting section and a second connecting section, wherein the second connecting section is connected to the first connecting section, and a first angle α is formed between the second connecting section and the first connecting section, satisfying 0°<α<180°.

[0013] Optionally, 130°≤α≤150° is satisfied.

[0014] Optionally, α=45° is satisfied.

[0015] Optionally, a second angle is formed between the first connecting segment and the first direction, a third angle is formed between the second connecting segment and the first direction, the third angle is equal to the second angle; and the length of the first connecting segment is equal to the length of the second connecting segment.

[0016] Optionally, the first connecting segment has a first projection in the first direction, and the second connecting segment has a second projection in the first direction, wherein the lengths of the first projection and the second projection are both L2, satisfying 0.06mm≤L2≤0.5mm.

[0017] Optionally, the first connecting segment has a third projection in the second direction, and the second connecting segment has a fourth projection in the second direction, wherein the lengths of the third projection and the fourth projection are both L1 / 2, satisfying L1 / 2=tan(α / 2)*L2.

[0018] Optionally, along the second direction, there is a second center line between two adjacent fine grids, wherein the main grid located between two adjacent fine grids is symmetrical about the corresponding second center line.

[0019] Optionally, the solar cell is a back-contact solar cell.

[0020] In a second aspect, the utility model further discloses a photovoltaic module, which comprises a plurality of solar cells as described in the first aspect, wherein the plurality of solar cells are arranged at intervals.

[0021] The utility model discloses a solar cell and a photovoltaic module, wherein the solar cell comprises a cell body and a main grid and a plurality of fine grids arranged on the surface of the cell body, wherein the plurality of fine grids extend along a first direction and are arranged at intervals along a second direction, and the second direction intersects with the first direction; the main grid extends along the second direction, the main grid has a bending section, the bending section is connected to the plurality of fine grids, and the bending section passes through a passivation layer on the surface of the cell body to collect current generated by the cell body.

[0022] In the utility model, a plurality of fine grids are arranged on the surface of the battery cell body, so that the plurality of fine grids extend along the first direction and are arranged at intervals along the second direction, so that the current generated by the battery cell body is collected by the plurality of fine grids. A main grid is arranged on the surface of the battery cell body, the main grid extends along the second direction, and the main grid is connected to the plurality of fine grids, so that the current collected by the fine grids can be collected by the main grid.

[0023] Furthermore, the main grid in the present invention has a bending section. During the screen printing process, the bending section can form a certain angle with the mesh yarn of the knotless screen, thereby achieving a better printing effect.

[0024] Furthermore, the bent section of the main grid in the utility model can pass through the passivation layer on the surface of the battery cell body to collect the current generated by the battery cell body. In other words, the main grid can collect the current collected by the fine grid and the current generated by the battery cell. Thus, the current generated by the battery cell can be better collected to improve the photoelectric conversion efficiency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing the structure of a solar cell in the prior art;

[0026] Figure 2 A schematic diagram showing the structure of the solar cell described in the embodiment of the utility model;

[0027] Figure 3 A partial enlargement of the solar cell described in the embodiment of the utility model is shown Figure 1 ;

[0028] Figure 4 A partial enlargement of the solar cell described in the embodiment of the utility model is shown Figure 2 ;

[0029] Figure 5 A schematic diagram showing the structure of a knotless screen.

[0030] Reference numerals:

[0031] 10: Battery body;

[0032] 20: fine grid;

[0033] 30: main grid; 31: bending section; 311: first connecting section; 312: second connecting section;

[0034] 40: first center line;

[0035] 50: buffer part;

[0036] 60: mesh plate without mesh knot; 61: mesh yarn;

[0037] 70: Second center line;

[0038] A: first direction; B: second direction. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] Reference Figure 1 , showing a schematic diagram of the structure of a solar cell in the prior art; referring to Figure 2 , showing a schematic diagram of the structure of the solar cell described in the embodiment of the utility model; referring to Figure 3 , showing a partial enlargement of the solar cell described in the embodiment of the utility model Figure 1 ;reference Figure 4 , showing a partial enlargement of the solar cell described in the embodiment of the utility model Figure 2 .

[0042] like Figure 1As shown, the solar cell in the prior art includes a cell body 10 and a fine grid 20 and a main grid 30 disposed on the surface of the cell body 10. The fine grid 20 includes a plurality of fine grids 20 extending along a first direction A and arranged at intervals along a second direction B, so as to collect the current generated by the cell body 10 through the plurality of fine grids 20. The main grid 30 extends along the second direction B and is connected to the plurality of fine grids 20, so as to collect the current collected by the plurality of fine grids 20 through the main grid 30. That is to say, in the solar cell in the prior art, the main grid 30 can only collect the current collected by the fine grid 20, but cannot collect the current generated by the cell body 10.

[0043] In the process of processing solar cells, the fine grid paste and the main grid paste are usually printed on the surface of the cell body 10 by screen printing to form the fine grid 20 and the main grid 30 on the surface of the cell body 10. The fine grid 20 and the main grid 30 are usually printed separately. Taking the back contact solar cell as an example, the first pass is to print the negative electrode fine grid on the back of the cell body 10, the second pass is to print the positive electrode fine grid on the back of the cell body 10, and the third pass is to print the main grid on the back of the cell body 10.

[0044] Take the back contact solar cell as an example. Figure 1 As shown, in the prior art solar cell, the fine grid 20 passes through the passivation layer on the back of the cell body 10, so that the current generated by the cell body 10 can be collected. However, the main grid 30 does not pass through the passivation layer on the back of the cell body 10. Therefore, the main grid 30 cannot collect the current generated by the cell body 10.

[0045] In order to further improve the utilization rate of the cell body surface and the photoelectric conversion efficiency of the solar cell, the utility model discloses a solar cell, wherein the main grid 30 can collect the current generated by the cell body 10 and the main grid 30 can also collect the current collected by the fine grid 20.

[0046] like Figures 2 to 4 As shown, an embodiment of the utility model discloses a solar cell, which comprises: a cell body 10 and a main grid 30 and a plurality of fine grids 20 arranged on the surface of the cell body 10, wherein the plurality of fine grids 20 extend along a first direction A and are arranged at intervals along a second direction B, and the second direction B intersects with the first direction A; the main grid 30 extends along the second direction B, and the main grid 30 has a bending section 31, the bending section 31 is connected to the plurality of fine grids 20, and the bending section 31 passes through the passivation layer on the surface of the cell body 10 to collect the current generated by the cell body 10.

[0047] In the embodiment of the utility model, it should be noted that the fine grid connected to the bending section 31 is a fine grid with the same polarity as the fine grid. The main grid 30 extends along the second direction B, which means that the main grid 30 extends along the second direction B as a whole, but the main grid 30 itself has a bending section 31.

[0048] In addition, the bending section 31 passes through the passivation layer on the surface of the battery cell body 10, which can be achieved by directly burning the bending section 31, or by performing a window process on the passivation layer and then preparing the bending section 31. In the embodiment of the utility model, there are no excessive restrictions on the specific method of the bending section 31 passing through the passivation layer on the surface of the battery cell body 10. In actual applications, technicians can choose a suitable method according to needs.

[0049] like Figures 2 to 4 As shown, the solar cell disclosed in the embodiment of the utility model includes a cell body 10 and a plurality of fine grids 20 and a main grid 30 arranged on the surface of the cell body 10. Among them, the cell body 10 is the core component of the solar cell, which can convert solar energy into electrical energy. The cell body 10 has a light-receiving surface facing the sun, also called the front side, and a backlight surface facing away from the sun, also called the back side.

[0050] Among them, the fine grid 20 and the main grid 30 can be arranged on the front side of the battery cell body 10, or on the back side of the battery cell body 10. In the embodiment of the utility model, there is no limitation on whether the fine grid 20 and the main grid 30 are arranged on the front side of the battery cell body 10 or on the back side of the battery cell body 10. In actual applications, technicians can set them according to needs.

[0051] The following description will be made by taking the case where the fine grid 20 and the main grid 30 are disposed on the back side of the cell body 10 as an example, that is, the solar cell is a back-contact solar cell as an example.

[0052] like Figure 2 and Figure 4 As shown, the plurality of fine grids 20 in the embodiment of the utility model all extend along the first direction A, and are arranged at intervals along the second direction B. The second direction B intersects with the first direction A. For example, the second direction B is perpendicular to the first direction A. The plurality of fine grids 20 can all pass through the passivation layer on the surface of the battery cell body 10 to collect the current generated by the battery cell body 10. The main grid 30 extends along the second direction B, and the main grid 30 has a bending section 31. The bending section 31 is connected to the plurality of fine grids 20 to collect the current collected by the plurality of fine grids 20 through the bending section 31. Furthermore, the bending section 31 can pass through the passivation layer on the surface of the battery cell body 10 to collect the current generated by the battery cell body 10.

[0053] That is to say, the bending section 31 in the embodiment of the utility model can not only collect the current collected by the multiple fine grids 20 , but also pass through the passivation layer on the surface of the battery cell body 10 to collect the current generated by the battery cell body 10 .

[0054] In such Figures 2 to 4 During the processing of the solar cell shown, a burn-through metal paste, such as silver paste, can be printed on the surface of the cell body 10 by screen printing to form a fine grid 20 and a main grid 30 on the surface of the cell body 10. That is to say, during the processing of the solar cell, the fine grid 20 and the main grid 30 can be printed on the surface of the cell body 10 at the same time, and both the fine grid 20 and the main grid 30 use the same burn-through metal paste, such as burn-through silver paste. Of course, the above are only individual examples of specific embodiments of the utility model and are not intended to be limitations of the utility model. In actual applications, the main grid 30 can also use a non-burn-through metal paste. After the passivation layer is subjected to a window opening process, the main grid 30 is prepared so that the bending section 31 can pass through the passivation layer on the surface of the cell body 10.

[0055] In the processing of solar cells, the following methods are usually used: Figure 5 The knotless screen 60 shown prints the metal paste on the surface of the cell body 10 to form the main grid 30. Figure 5 The knotless screen 60 shown is printed as Figure 1 When the main grid 30 of the solar cell is shown, the printing direction is the same as the first direction A, and the extension direction of the main grid 30 is perpendicular to the printing direction. In other words, the printing direction is the same as the first direction A, and the extension direction of the main grid 30 is the second direction B, and the second direction B is perpendicular to the first direction A. This leads to problems such as poor printing effect and printing abnormality.

[0056] like Figures 2 to 4 As shown, in the embodiment of the utility model, the main grid 30 has a bending section 31. During the screen printing process, the bending section 31 can form a certain angle with the mesh yarn 61 of the knotless screen 60, so that the slurry forms a certain shear force during the printing process, thereby achieving a better printing effect and reducing or avoiding printing abnormalities.

[0057] It should be noted that the fine grid 20 in the embodiment of the utility model can be a negative electrode fine grid or a positive electrode fine grid. When the fine grid 20 is a negative electrode fine grid, the main grid 30 is a negative electrode main grid. When the fine grid 20 is a positive electrode fine grid, the main grid 30 is a positive electrode main grid. There is no specific limitation on this. In actual applications, technicians can set it as needed. In other words, the main grid 30 and the fine grid connected thereto are of the same polarity. Optionally, the fine grid 20 in the embodiment of the utility model is a negative electrode fine grid, and the main grid 30 is a negative electrode main grid; and / or, the fine grid 20 is a positive electrode fine grid, and the main grid 30 is a positive electrode main grid.

[0058] In the embodiment of the utility model, when the fine grid 20 is a negative electrode fine grid, the main grid 30 is a negative electrode main grid. The current generated by the battery cell body 10 is collected by the negative electrode fine grid, and the current collected by the negative electrode fine grid is collected by the negative electrode main grid. At the same time, the current generated by the battery cell body 10 is collected by the negative electrode main grid. Optionally, the negative electrode main grid is a silver main grid.

[0059] And / or, when the fine grid 20 is a positive fine grid, the main grid 30 is a positive main grid. The current generated by the battery cell body 10 is collected through the positive fine grid, the current collected by the positive fine grid is collected through the positive main grid, and at the same time, the current generated by the battery cell body 10 is collected through the positive main grid.

[0060] Alternatively, if Figures 2 to 4 As shown, the bending segments 31 in the embodiment of the present invention include a plurality of bending segments 31 , and the plurality of bending segments 31 are arranged along the second direction B, and one bending segment 31 is connected to another adjacent bending segment 31 .

[0061] like Figures 2 to 4 As shown, the main grid 30 in the embodiment of the utility model has a plurality of bending segments 31, and the plurality of bending segments 31 are arranged in sequence along the second direction B, and one bending segment 31 is connected to another adjacent bending segment 31. That is, along the second direction B, the plurality of bending segments 31 are connected in sequence to form the main grid 30.

[0062] In the embodiment of the utility model, a plurality of bending sections 31 are sequentially connected along the second direction B to form a main grid 30. Each bending section 31 can form a relatively suitable angle with the mesh yarn of the knotless screen, so that the slurry has a better shear force during the printing process, thereby achieving a better printing effect.

[0063] Furthermore, a plurality of bent sections 31 are connected in sequence to form a main grid 30 , so that along the first direction A, the space occupied by each main grid 30 is not too large, thereby avoiding affecting the arrangement of other main grids 30 .

[0064] Alternatively, if Figure 4As shown, in the embodiment of the present invention, along the first direction A, the bending section 31 has a first center line 40 ; the connection between the bending section 31 and the fine grid 20 is located on the first center line 40 .

[0065] like Figure 4 As shown, along the first direction A, the first center line 40 is located in the middle of the bending section 31. That is, along the first direction A, the distance from the leftmost position of the bending section 31 to the first center line 40 is equal to the distance from the rightmost position of the bending section 31 to the first center line 40.

[0066] The connection between the bending section 31 and the fine grid 20 is located on the first center line 40. Each fine grid 20 is connected to the bending section 31 at the position of the first center line 40, and multiple connections are distributed on the same straight line along the second direction B, that is, multiple connections are distributed on the first center line 40 along the second direction B. The above-mentioned straight line distribution design makes the state of the current converged by each fine grid 20 to the main grid 30 consistent or nearly consistent, so that the overall performance of the solar cell is better.

[0067] Alternatively, if Figure 2 As shown, the solar cell disclosed in the embodiment of the utility model further includes a buffer portion 50, wherein the buffer portion 50 is arranged at the connection between the bending section 31 and the fine grid 20, and the length of the buffer portion 50 in the second direction B is greater than the length of the fine grid 20 in the second direction B.

[0068] When the main grid 30 is printed together with the fine grid 20, the printing direction is the same as the first direction A. Figure 2 As shown, in the process of printing from the position of the fine grid 20 to the above-mentioned connection, the area of ​​the target printed pattern increases sharply from small to large; in the process of printing from the above-mentioned connection to the position of the fine grid 20, the area of ​​the target printed pattern decreases sharply from large to small. A buffer portion 50 is provided at the connection between the bending section 31 and the fine grid 20 to improve the printing effect through the buffer portion 50, so that the reliability of the connection between the main grid 30 and the fine grid 20 is higher. The length of the buffer portion 50 in the second direction B is greater than the length of the fine grid 20 in the second direction B, so as to improve the situation where the target printing area changes suddenly, thereby improving the printing effect of the main grid 30 and the fine grid 20.

[0069] It should be noted that the buffer portion 50 in the embodiment of the utility model can also be formed by screen printing a metal paste on the surface of the battery cell body 10. For example, the buffer portion 50 can be formed by screen printing a silver paste on the surface of the battery cell body 10.

[0070] Alternatively, if Figures 2 to 4As shown, the bending section 31 in the embodiment of the utility model includes a first connecting section 311 and a second connecting section 312, wherein the second connecting section 312 is connected to the first connecting section 311, and there is a first angle α between the second connecting section 312 and the first connecting section 311, satisfying 0°<α<180°.

[0071] like Figures 2 to 4 As shown, the bending section 31 includes a first connecting section 311 and a second connecting section 312. The first connecting section 311 and the second connecting section 312 are both straight lines, and the second connecting section 312 is connected to the first connecting section 311, so that the bending section 31 is formed by the second connecting section 312 and the first connecting section 311.

[0072] It should be noted that, in the embodiment of the utility model, there is a first angle α between the second connecting section 312 and the first connecting section 311, and the first angle α is greater than 0° and less than 180°, so that both the first connecting section 311 and the second connecting section 312 can form a certain angle with the mesh yarn of the knotless screen, so that the slurry forms a certain shear force during the printing process, thereby achieving a better printing effect.

[0073] Exemplarily, in the embodiment of the present invention, the first angle α between the second connecting segment 312 and the first connecting segment 311 can be set to 30°, 50°, 70°, 90°, 110°, 130°, 150°, 170°, etc.

[0074] Preferably, 130°≤α≤150° is satisfied.

[0075] In the embodiment of the utility model, the first angle α between the second connecting section 312 and the first connecting section 311 is set to be greater than or equal to 130° and less than or equal to 150°. During the screen printing process, the first connecting section 311 and the second connecting section 312 can form a more suitable angle with the mesh yarn of the knotless screen, thereby achieving a better printing effect.

[0076] Furthermore, the first angle α between the second connecting section 312 and the first connecting section 311 is set to be greater than or equal to 130° and less than or equal to 150°. For battery cells of the same size, the number of bending sections 31 is reduced. During the screen printing process, the amount of metal paste used can also be reduced, thereby reducing the production cost of solar cells.

[0077] Exemplarily, in the embodiment of the present invention, the first angle α between the second connecting section 312 and the first connecting section 311 can be set to 130°, 135°, 140°, 145°, 150°, etc.

[0078] Preferably, α=45° is satisfied.

[0079] As a preferred implementation, in the embodiment of the utility model, the first angle α between the second connecting section 312 and the first connecting section 311 is set to 45°, so that the first connecting section 311 and the second connecting section 312 can form a more suitable angle with the mesh yarn of the knotless screen, thereby achieving a better printing effect.

[0080] Alternatively, if Figures 2 to 4 As shown, in the embodiment of the utility model, there is a second angle between the first connecting section 311 and the first direction A, and there is a third angle between the second connecting section 312 and the first direction A, and the third angle is equal to the second angle; and the length of the first connecting section 311 is equal to the length of the second connecting section 312.

[0081] like Figures 2 to 4 As shown, in the embodiment of the utility model, the length of the first connecting segment 311 is equal to the length of the second connecting segment 312. And the second angle between the first connecting segment 311 and the first direction A is equal to the third angle between the second connecting segment 312 and the first direction A. In other words, one end of the third connecting segment is connected to the end of the second connecting segment 312 away from the first connecting segment 311, and the other end of the third connecting segment is connected to the end of the first connecting segment 311 away from the second connecting segment 312, so that an isosceles triangle can be formed by the first connecting segment 311, the second connecting segment 312 and the third connecting segment, and the lengths of the first connecting segment 311 and the second connecting segment 312 of the isosceles triangle are equal.

[0082] Through the above arrangement, the multiple bending segments 31 of the main grid 30 can be arranged regularly, and the midpoint of the first connecting segment 311 of a bending segment 31 is connected to a thin grid 20, and the midpoint of the second connecting segment 312 of the bending segment 31 is connected to another adjacent thin grid 20. Alternatively, the center of the first connecting segment 311 of a bending segment 31 is connected to a thin grid 20, and the midpoint of the second connecting segment 312 of another bending segment 31 connected to the bending segment 31 is connected to another adjacent thin grid 20, but it is not limited to this. For example, other bending segments 31 may be spaced between the above bending segment 31 and the above another bending segment 31. In this way, the state of the current converged to the main grid 30 by each thin grid 20 is consistent or nearly consistent, and the overall performance of the solar cell is better.

[0083] Alternatively, if Figure 3 and Figure 4 As shown, the first connecting section 311 in the embodiment of the utility model has a first projection in the first direction A, and the second connecting section 312 has a second projection in the first direction A, wherein the lengths of the first projection and the second projection are both L2, satisfying 0.06mm≤L2≤0.5mm.

[0084] like Figure 3 and Figure 4 As shown, the first connecting segment 311 has a first projection in the first direction A, and the second connecting segment 312 has a second projection in the first direction A. The lengths of the first projection and the second projection are equal, both L2. Wherein, L2 is greater than or equal to 0.06 mm and less than or equal to 0.5 mm. In this way, along the first direction A, the space occupied by each main grid 30 will not be too large, so as to avoid affecting the arrangement of other main grids 30.

[0085] Illustratively, L2 can be set to 0.06 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc.

[0086] Alternatively, if Figure 3 and Figure 4 As shown, the first connecting segment 311 in the embodiment of the utility model has a third projection in the second direction B, and the second connecting segment 312 has a fourth projection in the second direction B, wherein the lengths of the third projection and the fourth projection are both L1 / 2, satisfying L1 / 2=tan(α / 2)*L2.

[0087] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the third projection of the first connecting section 311 in the second direction B is equal to the fourth projection of the second connecting section 312 in the second direction B. The sum of the length of the third projection and the length of the fourth projection is L1, that is, the length of the third projection and the length of the fourth projection are both L1 / 2.

[0088] As mentioned above, an isosceles triangle can be formed by the first connecting segment 311, the second connecting segment 312, and the third connecting segment connecting the first connecting segment 311 and the second connecting segment 312. In the isosceles triangle, tan(α / 2)=(L1 / 2) / L2. In other words, L1 / 2=tan(α / 2)*L2. Through the above arrangement, the state of the current flowing from each fine grid 20 to the main grid 30 can be consistent or nearly consistent, and the overall performance of the solar cell is better.

[0089] It should be noted that in the embodiment of the present invention, along the second direction B, the distance between two adjacent fine grids 20 is set to L3, and the number of bends of the main grid 30 between two adjacent fine grids 20 is recorded as n. Figure 3 and Figure 4 As shown in FIG. 1 , the column grid 30 between two adjacent fine grids 20 has three bends, so n=3. Figure 4 As shown, when n=3, Figure 4L4=L3 / 6. When n=4, L4=L3 / 8. That is, L4=L3 / 2n. In summary, L2, L3, L4 and α satisfy that tan(a / 2)=L4 / (L2 / 2)=(L3 / 2n) / (L2 / 2)=L3 / nL2.

[0090] Alternatively, if Figure 4 As shown, in the embodiment of the present invention, along the second direction B, there is a second center line 70 between two adjacent fine grids 20 , and the main grid 30 located between the two adjacent fine grids 20 is symmetrical about the corresponding second center line 70 .

[0091] like Figure 4 As shown, along the second direction B, there is a second center line 70 between two adjacent fine grids 20. That is, along the second direction B, the two adjacent fine grids 20 are symmetrical about the corresponding second center line. In the embodiment of the utility model, the main grid 30 located between the two adjacent fine grids 20 is also set to be symmetrical about the corresponding second center line 70. Thereby, the multiple bending sections 31 of the main grid 30 present a more regular arrangement, so as to further improve the overall performance of the solar cell.

[0092] Optionally, the cell comprises a back-contact solar cell.

[0093] The solar cell in the embodiment of the utility model can be a back contact solar cell. That is to say, the positive grid lines of the solar cell and the negative grid lines of the solar cell are both arranged on the back of the cell body 10 to avoid the positive grid lines and the negative grid lines from blocking the front of the cell body 10, thereby improving the photoelectric conversion efficiency of the solar cell. Among them, the positive grid lines include positive fine grids and positive main grids, and the negative grid lines include negative fine grids and negative main grids.

[0094] It should be noted that the above method of setting the solar cell as a back-contact solar cell is only an individual example of the embodiment of the utility model, and is not a limitation of the utility model. In actual applications, the solar cell may also be other types of solar cells. In this regard, the embodiment of the utility model does not make specific limitations, and in actual applications, technicians can set it as needed.

[0095] The utility model discloses a solar cell and a photovoltaic module, wherein the solar cell comprises a cell body and a main grid and a plurality of fine grids arranged on the surface of the cell body, wherein the plurality of fine grids extend along a first direction and are arranged at intervals along a second direction, and the second direction intersects with the first direction; the main grid extends along the second direction, the main grid has a bending section, the bending section is connected to the plurality of fine grids, and the bending section passes through a passivation layer on the surface of the cell body to collect current generated by the cell body.

[0096] In the utility model, a plurality of fine grids are arranged on the surface of the battery cell body, so that the plurality of fine grids extend along the first direction and are arranged at intervals along the second direction, so that the current generated by the battery cell body is collected by the plurality of fine grids. A main grid is arranged on the surface of the battery cell body, the main grid extends along the second direction, and the main grid is connected to the plurality of fine grids, so that the current collected by the fine grids can be collected by the main grid.

[0097] Furthermore, the main grid in the present invention has a bending section. During the screen printing process, the bending section can form a certain angle with the mesh yarn of the knotless screen, thereby achieving a better printing effect.

[0098] Furthermore, the bent section of the main grid in the utility model can pass through the passivation layer on the surface of the battery cell body to collect the current generated by the battery cell body. In other words, the main grid can collect the current collected by the fine grid and the current generated by the battery cell. Thus, the current generated by the battery cell can be better collected to improve the photoelectric conversion efficiency of the battery cell.

[0099] The embodiment of the utility model further discloses a photovoltaic assembly, which includes the solar cell described in the above embodiment, wherein the solar cell includes a plurality of solar cells, and the plurality of solar cells are arranged at intervals.

[0100] It should be noted that in the embodiment of the utility model, the solar cell included in the photovoltaic module has the same structure as the solar cell described in the above embodiment, and its beneficial effects are also similar, which will not be described in detail here.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, 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 present invention.

Claims

1. A solar cell, characterized in that: include: A battery cell body and a main grid and a plurality of fine grids arranged on the surface of the battery cell body, wherein: The plurality of fine grids extend along a first direction and are arranged at intervals along a second direction, and the second direction intersects the first direction; The main grid extends along the second direction, and has a bent section, wherein the bent section is connected to a plurality of the fine grids, and the bent section passes through a passivation layer on a surface of the battery cell body to collect current generated by the battery cell body.

2. The solar cell according to claim 1, characterized in that: The fine grid is a negative electrode fine grid, and the main grid is a negative electrode main grid; And / or, the fine grid is a positive electrode fine grid, and the main grid is a positive electrode main grid.

3. The solar cell according to claim 1, characterized in that: The bending segments include a plurality of bending segments, and the plurality of bending segments are arranged along the second direction, and one bending segment is connected to another adjacent bending segment.

4. The solar cell according to claim 1, characterized in that: Along the first direction, the bending section has a first center line; The connection between the bent section and the fine grid is located on the first center line.

5. The solar cell according to claim 4, characterized in that: The solar cell sheet further includes a buffer portion, wherein: The buffer portion is disposed at a connection between the bending section and the fine grid, and a length of the buffer portion in the second direction is greater than a length of the fine grid in the second direction.

6. The solar cell according to any one of claims 1 to 5, characterized in that: The bending section includes a first connecting section and a second connecting section, wherein: The second connecting section is connected to the first connecting section, and a first angle α is formed between the second connecting section and the first connecting section, satisfying 0°<α<180°.

7. The solar cell according to claim 6, characterized in that: Satisfies 130°≤α≤150°.

8. The solar cell according to claim 6, characterized in that: Satisfies α=45°.

9. The solar cell according to claim 6, characterized in that: A second angle is formed between the first connecting section and the first direction, a third angle is formed between the second connecting section and the first direction, and the third angle is equal to the second angle; And the length of the first connecting section is equal to the length of the second connecting section.

10. The solar cell according to claim 9, characterized in that: The first connecting segment has a first projection in the first direction, and the second connecting segment has a second projection in the first direction, wherein: The lengths of the first projection and the second projection are both L2, satisfying 0.06 mm ≤ L2 ≤ 0.5mm.

11. The solar cell according to claim 10, characterized in that: The first connecting segment has a third projection in the second direction, and the second connecting segment has a fourth projection in the second direction, wherein: The lengths of the third projection and the fourth projection are both L1 / 2, satisfying L1 / 2=tan(α / 2)*L2.

12. The solar cell according to claim 1, characterized in that: Along the second direction, there is a second center line between two adjacent fine grids, wherein: The main grid located between two adjacent fine grids is symmetrical about the corresponding second center line.

13. The solar cell according to claim 1, characterized in that: The cell is a back-contact solar cell.

14. A photovoltaic module, characterized in that: The invention comprises a plurality of solar cells according to any one of claims 1 to 13, wherein the plurality of solar cells are arranged at intervals.

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