Solar cell and photovoltaic module

Abstract

The invention discloses a solar cell and a photovoltaic module, and belongs to the field of photovoltaic technology. The solar cell comprises a cell body, and the width of the cell body is L1 along a first direction; the pattern area is arranged on the surface of the battery piece body, a plurality of current collection electrodes extending in the second direction are arranged in the pattern area, the current collection electrodes comprise the first current collection electrodes and the second current collection electrodes, the first current collection electrodes and the second current collection electrodes are arranged at intervals in the first direction, and the second direction is different from the first direction; the battery piece body is provided with a first side edge and a second side edge which are oppositely arranged, the first side edge and the second side edge comprise parts extending in the second direction, and the distance between the position, close to the first side edge, of the pattern area and the first side edge is D1; when the polarities of the first collector electrode and the second collector electrode are opposite, L1 / D1 is greater than or equal to 80 and less than or equal to 400; and / or when the polarity of the first collector electrode and the polarity of the second collector electrode are the same, 50 < = L1 / D1 < = 350 is satisfied.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on May 15, 2024, with application number 202421065934.9 and titled “A Solar Cell and Photovoltaic Module”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of photovoltaic technology, and in particular to a solar cell and a photovoltaic module. Background Art

[0003] Solar cells are the core components of photovoltaic modules, which can convert solar energy into electrical energy. A plurality of fine grids are arranged on the surface of the cell, which are arranged at intervals along a first direction and extend along a second direction to collect the current generated by the cell through the plurality of fine grids.

[0004] The area where multiple fine grids are located is the electrode pattern area. The industry has not paid attention to how to set the distance between the electrode pattern area and the edge of the cell to improve the photoelectric conversion efficiency and yield of the cell when the cell sizes, cell types and cell manufacturing processes are different. Summary of the invention

[0005] The present application discloses a solar cell and a photovoltaic module to solve or at least partially solve the problem in the prior art of how to set the distance between the electrode pattern area and the edge of the cell to improve the photoelectric conversion efficiency and yield of the cell.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, the present application discloses a solar cell, which includes a cell body, wherein the width of the cell body along a first direction is L1; a graphic area, wherein the graphic area is arranged on the surface of the cell body, and wherein the graphic area has a plurality of collecting electrodes extending along a second direction, wherein the collecting electrodes include a first collecting electrode and a second collecting electrode, and the first collecting electrode and the second collecting electrode are arranged at intervals along the first direction; wherein the second direction is different from the first direction; the cell body has a first side edge and a second side edge which are arranged opposite to each other, wherein the first side edge and the second side edge include a portion extending along the second direction, and a distance between a position of the graphic area close to the first side edge and the first side edge is D1; ​​when the polarities of the first collecting electrode and the second collecting electrode are opposite, 80≤L1 / D1≤400 is satisfied; and / or when the polarities of the first collecting electrode and the second collecting electrode are the same, 50≤L1 / D1≤350 is satisfied.

[0008] Optionally, when the first collecting electrode and the second collecting electrode have opposite polarities, the number of the first collecting electrodes or the second collecting electrodes is M, satisfying 0.9≤M / L1≤1.8; and / or, when the first collecting electrode and the second collecting electrode have the same polarity, the sum of the number of the first collecting electrode and the second collecting electrode is M, satisfying 0.9≤M / L1≤1.8.

[0009] Optionally, when the first collecting electrode and the second collecting electrode have opposite polarities, 0.93≤M / L1≤1.5 is satisfied; and / or when the first collecting electrode and the second collecting electrode have the same polarity, 0.93≤M / L1≤1.5 is satisfied.

[0010] Optionally, the battery cell body further includes a chamfer, and both ends of the first side are directly connected to the chamfer; along the first direction, the distance between the position of the graphic area close to the second side and the second side is D3, satisfying 0.5≤D3:D1≤1.

[0011] Optionally, when the first collecting electrode and the second collecting electrode have opposite polarities, along the first direction, the distance between adjacent first collecting electrodes and the second collecting electrodes is N, satisfying 11.00≤L1 / (D1+N)≤37.02; and / or, satisfying N≤D1≤2N.

[0012] Optionally, along the first direction, the distance between two adjacent first collecting electrodes or the second collecting electrodes located at the edge is N1, and the distance between two adjacent first collecting electrodes or the second collecting electrodes located in the middle is N2, satisfying D1<N1<N2, and / or, 2D1>N1, or, 2D1>N2, or, 2N1>N2.

[0013] Optionally, along the second direction, the length of the battery cell body is L2, and the distance between the position of the graphic area close to the edge of the battery cell body and the same edge of the battery cell body is D2; when the first collecting electrode and the second collecting electrode have opposite polarities, 150≤L2 / D2≤750 is satisfied; and / or when the first collecting electrode and the second collecting electrode have the same polarity, 50≤L2 / D2≤650 is satisfied.

[0014] Optionally, D1≥D2 is satisfied.

[0015] Optionally, when the battery cell body is a rectangular structure or a quasi-rectangular structure, when the first collecting electrode and the second collecting electrode have opposite polarities, L1 / D1≤L2 / D2 is satisfied; and / or when the first collecting electrode and the second collecting electrode have the same polarity, L1 / D1≥L2 / D2 is satisfied.

[0016] Optionally, 75 mm ≤ L1 ≤ 175 mm is satisfied; and / or, along the second direction, the length of the battery cell body is L2, which satisfies 150 mm ≤ L2 ≤ 350 mm; and / or, the area of ​​the battery cell body is S, which satisfies 11250 mm 2 ≤S≤61250mm 2 .

[0017] Optionally, 50≤M≤225 is satisfied.

[0018] In a second aspect, the present application discloses a solar cell, which includes a cell body, wherein the width of the cell body along a first direction is L1; a graphic area, wherein the graphic area is arranged on the surface of the cell body, wherein the graphic area includes two, wherein the two graphic areas are arranged at intervals along the first direction, wherein the graphic area has a plurality of collector electrodes extending along a second direction, wherein the collector electrodes include a first collector electrode and a second collector electrode, wherein the first collector electrode and the second collector electrode are arranged at intervals along the first direction; wherein the second direction is different from the first direction; wherein the cell body includes a first side edge and a second side edge which are arranged opposite to each other, wherein the first side edge and the second side edge include a portion extending along the second direction, wherein the distance between a position of the graphic area close to the first side edge and the first side edge, and the distance between a position of the graphic area close to the second side edge and the second side edge are both D1; when the polarities of the first collector electrode and the second collector electrode are opposite, 80≤L1 / 2D1≤400 is satisfied; and / or when the polarities of the first collector electrode and the second collector electrode are the same, 50≤L1 / 2D1≤350 is satisfied.

[0019] Optionally, when the polarities of the first collecting electrode and the second collecting electrode are opposite, the number of the first collecting electrodes or the second collecting electrodes is M, satisfying 0.9≤M / L1≤1.8; or, when the polarities of the first collecting electrode and the second collecting electrode are the same, the sum of the numbers of the first collecting electrode and the second collecting electrode is M, satisfying 0.9≤M / L1≤1.8.

[0020] Optionally, when the first collecting electrode and the second collecting electrode have opposite polarities, 0.93≤M / L1≤1.5 is satisfied; and / or when the first collecting electrode and the second collecting electrode have the same polarity, 0.93≤M / L1≤1.5 is satisfied.

[0021] Optionally, the battery cell body further includes a chamfer, both ends of the first side are directly connected to the chamfer, both ends of the second side are directly connected to the chamfer, and along the first direction, the distance between the two graphic areas is D3, satisfying 0.5≤D3:2D1≤1.

[0022] Optionally, when the first collecting electrode and the second collecting electrode have opposite polarities, within the same graphic area, along the first direction, the distance between adjacent first collecting electrodes and second collecting electrodes is N, satisfying 11.00≤L1 / 2(D1+N)≤37.02, and / or satisfying N≤D1≤2N.

[0023] Optionally, in the same graphic area, along the first direction, the distance between two adjacent first collecting electrodes or the second collecting electrodes located in the edge area is N1, and the distance between two adjacent first collecting electrodes or the second collecting electrodes located in the middle area is N2, satisfying D1<N1<N2, and / or, 2D1>N1, or, 2D1>N2, or, 2N1>N2.

[0024] Optionally, along the second direction, the length of the battery cell body is L2, and the distance between the position of the graphic area close to the edge of the battery cell body and the same edge of the battery cell body is D2; when the first collecting electrode and the second collecting electrode have opposite polarities, 150≤L2 / D2≤750 is satisfied; and / or when the first collecting electrode and the second collecting electrode have the same polarity, 50≤L2 / D2≤650 is satisfied.

[0025] Optionally, D1≥D2 is satisfied.

[0026] Optionally, when the battery cell body is a rectangular structure or a quasi-rectangular structure, when the first collecting electrode and the second collecting electrode have opposite polarities, L1 / 2D1≤L2 / D2 is satisfied, and / or when the first collecting electrode and the second collecting electrode have the same polarity, L1 / 2D1≥L2 / D2 is satisfied.

[0027] Optionally, 75 mm ≤ L1 / 2 ≤ 175 mm is satisfied, and / or, along the second direction, the length of the battery cell body is L2, which satisfies 150 mm ≤ L2 ≤ 350 mm, and / or, the area of ​​the battery cell body is S, which satisfies 11250 mm 2 ≤S / 2≤61250mm 2 .

[0028] Optionally, 50≤M / 2≤225 is satisfied.

[0029] In a third aspect, the present application further discloses a photovoltaic module, which includes a plurality of solar cells as described in the first aspect, wherein the plurality of solar cells are arranged at intervals.

[0030] The present application discloses a solar cell and a photovoltaic module, wherein the solar cell comprises a cell body and a graphic region disposed on the surface of the cell body. Along the first direction, the width of the cell body is L1. The graphic region has a plurality of collector electrodes extending along the second direction, the collector electrodes comprising a first collector electrode and a second collector electrode, and the first collector electrode and the second collector electrode are arranged at intervals along the first direction. The cell body has a first side edge and a second side edge disposed opposite to each other, the first side edge and the second side edge comprise a portion extending along the second direction, and the distance between the position of the graphic region close to the first side edge and the first side edge is D1; ​​when the polarities of the first collector electrode and the second collector electrode are opposite, 80≤L1 / D1≤400 is satisfied; and / or, when the polarities of the first collector electrode and the second collector electrode are the same, 50≤L1 / D1≤350 is satisfied.

[0031] In the present application, when the polarities of the first collector electrode and the second collector electrode are opposite, L1 / D1 is set to be greater than or equal to 80 and less than or equal to 400. And / or, when the polarities of the first collector electrode and the second collector electrode are the same, L1 / D1 is set to be greater than or equal to 50 and less than or equal to 350. Through the above settings, the ratio of L1 / D1 can meet the size requirements of D1 for cells with different widths L1. Thereby reducing the difficulty of alignment during the formation of the fine grid and improving the yield of the fine grid. Furthermore, through the above settings, the risk of fine grid overlap can also be reduced, and the shading loss can be reduced to improve the photoelectric conversion efficiency of the cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 1 ;

[0033] Figure 2 The structure of the solar cell described in the embodiment of the present application is shown in FIG. Figure 2 ;

[0034] Figure 3 A schematic diagram showing a partial structure of a solar cell according to an embodiment of the present application;

[0035] Figure 4 A schematic diagram showing the structure of a busbar line of a solar cell in the prior art;

[0036] Figure 5 A schematic diagram showing the structure of the interconnection part of a solar cell in the prior art;

[0037] Figure 6 A side view showing stress distribution of a welding strip in the prior art;

[0038] Figure 7A schematic diagram showing the structure of a busbar line of a solar cell in an embodiment of the present application;

[0039] Figure 8 A schematic diagram showing the structure of the interconnection portion of a solar cell in an embodiment of the present application;

[0040] Fig. 9 A side view showing stress distribution of the welding strip in an embodiment of the present application is shown.

[0041] Reference numerals:

[0042] 10: battery cell body; 11: first side edge; 12: second side edge;

[0043] 20: Graphics area;

[0044] 30: busbar line; 31: interconnection part; 32: connection line;

[0045] 40: welding strip;

[0046] A: first direction; B: second direction. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the fixed scope of the present application.

[0048] 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 application. 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.

[0049] Along the first direction, the battery cell has a first side and a second side that are arranged opposite to each other. Along the first direction, if the width of the battery cell increases, the transmission resistance increases, and the fine grids need to be arranged more densely. At the same time, the distance between the electrode pattern area and the first side of the battery cell needs to be adjusted. If the width of the battery cell decreases, the shading increases, the fine grids need to be arranged more sparsely, and the distance between the electrode pattern area and the first side of the battery cell also needs to be adjusted.

[0050] If the distance between the electrode pattern area and the first side of the cell is too close along the first direction, the tolerance of the fine grid offset will be reduced, the difficulty of alignment during the fine grid formation process will be increased, and the yield rate of the fine grid will be reduced. If the distance between the electrode pattern area and the first side of the cell is too far along the first direction, the distance between adjacent fine grids will be narrowed, the risk of fine grid overlap will be high, and the shielding loss will increase, affecting the photoelectric conversion efficiency of the cell.

[0051] For back-contact solar cells, the positive electrode fine grid and the negative electrode fine grid are both arranged on the same surface of the cell, that is, both are arranged on the back of the cell, and the distance between adjacent positive electrode fine grids or adjacent negative electrode fine grids is farther, and the carrier transmission distance is farther. If the width of the cell increases along the first direction, the carrier transmission of the back-contact solar cell is more difficult than that of the double-sided contact solar cell.

[0052] Moreover, for back-contact solar cells, both the positive and negative fine grids are arranged on the back of the cell, and the shading loss is greater than that of double-sided contact solar cells. In other words, if the width of the cell decreases along the first direction, the shading loss of the back-contact solar cell is more serious.

[0053] Therefore, for the back-contact solar cell and the double-sided contact solar cell, along the first direction, after the width of the cell changes, the adjustment range of the distance between the fine grid closest to the first side of the cell and the first side of the cell is also different. In order to overcome the above-mentioned aggravated loss, the width of the back-contact solar cell is set slightly smaller, and along the first direction, the ratio of the width of the cell to the distance between the fine grid closest to the first side of the cell and the first side of the cell is slightly larger.

[0054] Reference Figure 1 , showing the structure of the solar cell described in the embodiment of the present application Figure 1 .

[0055] like Figure 1As shown, an embodiment of the present application discloses a solar cell, which includes a cell body 10, along a first direction A, the width of the cell body 10 is L1; a graphic area 20, the graphic area 20 is arranged on the surface of the cell body 10, and a plurality of collecting electrodes (not shown) extending along a second direction B are provided in the graphic area 20, the collecting electrodes include a first collecting electrode (not shown) and a second collecting electrode (not shown), and the first collecting electrode and the second collecting electrode are arranged at intervals along the first direction A; wherein the second direction B is different from the first direction A; the cell body 10 has a first side 11 and a second side 12 arranged opposite to each other, the first side 11 and the second side 12 include a portion extending along the second direction B, and the distance between the position of the graphic area 20 close to the first side 11 and the first side 11 is D1; ​​when the polarities of the first collecting electrode and the second collecting electrode are opposite, 50≤L1 / D1≤400 is satisfied; and / or, when the polarities of the first collecting electrode and the second collecting electrode are the same, 50≤L1 / D1≤350 is satisfied.

[0056] The embodiment of the present application discloses a solar cell, which is a core component of a photovoltaic module and can convert solar energy into battery energy. The solar cell has a light-receiving surface facing the sunlight, also called the front surface. The solar cell also has a backlight surface facing away from the sunlight, also called the back surface.

[0057] like Figure 1 As shown, the solar cell disclosed in the present application includes a cell body 10 and a graphic area 20 arranged on the surface of the cell body 10. The graphic area 20 can be arranged on the front side of the cell body 10 or on the back side of the cell body 10. In this regard, no specific limitation is made in the embodiments of the present application. In actual applications, technicians can set it as needed.

[0058] The cell body 10 may be a rectangular structure, a square structure, or a quasi-rectangular structure, wherein the quasi-rectangular structure refers to a rectangular cell having a rounded chamfer or a square chamfer, and the rounded chamfer or the square chamfer is directly connected to the first side 11 of the cell body 10. Of course, the cell body 10 may also be other shapes. In the embodiment of the present application, there are no excessive restrictions on the specific structure of the cell body 10.

[0059] The following description will be made by taking the battery cell body 10 as a rectangular structure as an example. When the battery cell body 10 is a rectangular structure, along the first direction A, the width of the battery cell body 10 is L1, and along the second direction B, the length of the battery cell body 10 is L2.

[0060] It should be noted that if Figure 1As shown, the solar cell in the embodiment of the present application is a half-cell solar cell. It can be understood that the half-cell solar cell can be formed by cutting a whole solar cell before forming a collector electrode, or can be formed by cutting a whole solar cell after forming a collector electrode, or can be formed by directly preparing a half-cell silicon wafer formed by cutting a silicon wafer.

[0061] like Figure 1 As shown, the graphic region 20 is disposed on the surface of the cell body 10 , and has a plurality of collector electrodes extending along the second direction B in the graphic region 20 , which are also called fine grids. The area occupied by the plurality of collector electrodes on the surface of the cell body 10 is called the graphic region 20 .

[0062] It should be noted that the graphic area 20 can be a rectangular structure, a quasi-rectangular structure, a square structure, or a structure of other shapes. In the embodiment of the present application, there are no excessive restrictions on the specific shape of the graphic area 20. In actual applications, technicians can set the specific structure of the graphic area 20 as needed.

[0063] The following description will be made by taking the graphic area 20 as a rectangular structure as an example.

[0064] It should be noted that the collector electrode in the embodiment of the present application includes a first collector electrode and a second collector electrode. The first collector electrode and the second collector electrode both extend along the second direction B and are arranged along the first direction A at intervals.

[0065] like Figure 1 As shown, when the battery cell body 10 is a rectangular structure, the battery cell body 10 has a first side 11 and a second side 12 that are arranged opposite to each other, and the first side 11 and the second side 12 include a portion extending along the second direction B. The graphic area 20 is also a rectangular structure. The distance between the position of the graphic area 20 close to the first side 11 and the first side 11 is set to D1.

[0066] It should be noted that, in the embodiment of the present application, the position of the graphic area 20 close to the first side 11 is the position of the collector electrode located closest to the first side 11 in the graphic area 20. And D1 is the distance between the collector electrode located closest to the first side 11 and the first side 11.

[0067] When the polarities of the first collector electrode and the second collector electrode are opposite, that is, when the solar cell is a back-contact solar cell, 80≤L1 / D1≤400 is satisfied. In the embodiment of the present application, the ratio of the width L1 of the cell body 10 and the distance D1 between the position of the graphic area 20 close to the first side 11 and the first side 11 is set to be greater than or equal to 80 and less than or equal to 400. On the basis of taking into account the difficulty of carrier transmission and electrode shielding loss, at the same time, the difficulty of electrode alignment and the risk of electrode overlap are reduced, thereby improving the yield and photoelectric conversion efficiency of solar cells.

[0068] Exemplarily, when the polarities of the first collector electrode and the second collector electrode are opposite, the ratio of the width L1 of the cell body 10 and the distance D1 between the position of the graphic area 20 close to the first side 11 and the first side 11 can be 80, 100, 125, 150, 175, 200, 225, 250, 300, 350, 380, 400, etc. When the polarities of the first collector electrode and the second collector electrode are the same, that is, when the solar cell is a double-sided solar cell, 50≤L1 / D1≤350 is satisfied. In the embodiment of the present application, the ratio of the width L1 of the cell body 10 and the distance D1 between the position of the graphic area 20 close to the first side 11 and the first side 11 is set to be greater than or equal to 50 and less than or equal to 350. On the basis of taking into account the difficulty of carrier transmission and electrode shielding loss, at the same time, the difficulty of electrode alignment and the risk of electrode overlap are reduced, thereby improving the yield and photoelectric conversion efficiency of solar cells.

[0069] Exemplarily, when the first collecting electrode and the second collecting electrode have the same polarity, the ratio of the width L1 of the battery cell body 10 and the distance D1 between the position of the graphic area 20 close to the first side 11 and the first side 11 can be 50, 60, 80, 100, 120, 140, 160, 180, 220, 250, 300, 350, etc.

[0070] Optionally, when the polarities of the first collecting electrode and the second collecting electrode are opposite, the number of the first collecting electrode or the second collecting electrode is M, satisfying 0.9≤M / L1≤1.8; or, when the polarities of the first collecting electrode and the second collecting electrode are the same, the sum of the numbers of the first collecting electrode and the second collecting electrode is M, satisfying 0.9≤M / L1≤1.8.

[0071] When the polarities of the first collector electrode and the second collector electrode are opposite, that is, two electrodes with opposite polarities are arranged on the surface of the solar cell. The solar cell is a back contact solar cell. The number of the first collector electrodes is M, or the number of the second collector electrodes M satisfies 0.9≤M / L1≤1.8.

[0072] In the embodiment of the present application, by setting the ratio of the number M of the first collecting electrodes or the second collecting electrodes to the width L1 of the battery cell body 10 to be greater than or equal to 0.9 and less than or equal to 1.8, the surface of the battery cell body 10 has enough collecting electrodes, thereby ensuring the current collection efficiency of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0073] Exemplarily, when the polarities of the first collector electrode and the second collector electrode are opposite, along the first direction A, the width of the battery cell body 10 is L1, the number of the first collector electrodes is M, and M / L1=0.9 is satisfied. Alternatively, M / L1=1.2 is satisfied. When the polarities of the first collector electrode and the second collector electrode are opposite, along the first direction A, the width of the battery cell body 10 is L1, the number of the second collector electrodes is M, and M / L1=1.5 is satisfied. Alternatively, M / L1=1.8 is satisfied.

[0074] It should be noted that when the polarities of the first collecting electrode and the second collecting electrode are opposite, that is, when the solar cell is a back-contact solar cell, if the number of the first collecting electrode and the second collecting electrode is not equal, the number of M shall be based on the larger number of the first collecting electrode or the second collecting electrode.

[0075] When the polarity of the first collector electrode and the second collector electrode is the same, that is, only one polarity electrode is provided on the surface of the solar cell. The solar cell is a double-sided solar cell. The sum of the number of the first collector electrode and the second collector electrode is M, which satisfies 0.9≤M / L1≤1.8.

[0076] In the embodiment of the present application, by setting the ratio of the sum M of the number of the first collecting electrodes and the second collecting electrodes to the width L1 of the battery cell body 10 to be greater than or equal to 0.9 and less than or equal to 1.8, the surface of the battery cell body 10 has enough collecting electrodes, thereby ensuring the current collection efficiency of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0077] For example, when the polarities of the first collector electrode and the second collector electrode are the same, along the first direction A, the width of the battery cell body 10 is L1, and the sum of the number of the first collector electrode and the second collector electrode is M, which satisfies M / L1=0.9. Alternatively, M / L1=1.25. Alternatively, M / L1=1.5. Alternatively, M / L1=1.8.

[0078] Preferably, when the polarities of the first collector electrode and the second collector electrode are opposite, 0.93≤M / L1≤1.5 is satisfied; or, when the polarities of the first collector electrode and the second collector electrode are the same, 0.93≤M / L1≤1.5 is satisfied. This allows the surface of the cell body 10 to have enough collector electrodes, thereby ensuring the current collection efficiency of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0079] Alternatively, if Figure 1 As shown, the battery cell body 10 includes a chamfer, and both ends of the first side 11 are directly connected to the chamfer; along the first direction A, the distance between the position of the graphic area 20 close to the second side 12 and the second side 12 is D3, satisfying 0.5≤D3:D1≤1.

[0080] like Figure 1 As shown, in the embodiment of the present application, along the first direction A, the distance between the position of the graphic area 20 close to the second side 12 and the second side 12 is set to D3, wherein 0.5≤D3:D1≤1. Through the above setting, the area of ​​the graphic area 20 can be increased, the position of the graphic area 20 can be clarified, thereby maximizing the use of the surface area of ​​the cell body 10 and improving the photoelectric conversion efficiency of the solar cell.

[0081] Furthermore, the area of ​​the cell body 10 near the second side 12 may be partially damaged after being cut and sliced ​​after forming the cell, so D3:D1 is set to be less than or equal to 1. However, D3 cannot be too small, as a too small D3 will affect the collection area of ​​the carriers. Therefore, in the embodiment of the present application, D3:D1 is set to be greater than or equal to 0.5.

[0082] Exemplarily, D3:D1=0.5 is satisfied; or, D3:D1=0.7; or, D3:D1=0.9; or, D3:D1=1 is satisfied.

[0083] It should be noted that, in the embodiment of the present application, the position of the graphic area 20 close to the second side 12 is the position of the collector electrode located closest to the second side 12 in the graphic area 20. And D3 is the distance between the collector electrode located closest to the second side 12 and the second side 12.

[0084] Optionally, when the first collecting electrode and the second collecting electrode have opposite polarities, along the first direction A, the distance between adjacent first collecting electrodes and the second collecting electrodes is N, satisfying 11.00≤L1 / (D1+N)≤37.02; and / or, satisfying N≤D1≤2N.

[0085] When the polarities of the first collector electrode and the second collector electrode are opposite, that is, when the solar cell is a back-contact solar cell, the back of the cell body 10 has a plurality of first collector electrodes and a plurality of second collector electrodes. The plurality of first collector electrodes and the plurality of second collector electrodes extend along the second direction B and are alternately arranged on the back of the cell body 10 along the first direction A. Along the first direction A, the distance between adjacent first collector electrodes and second collector electrodes is N, satisfying 11.00≤L1 / (D1+N)≤37.02.

[0086] Through the above arrangement, the probability of successful alignment of the electrode pattern of the back contact solar cell can be improved, the transmission resistance can be reduced, and the photoelectric conversion efficiency of the solar cell can be improved.

[0087] For example, L1 / (D1+N)=11.00 is satisfied. Alternatively, L1 / (D1+N)=15 is satisfied. Alternatively, L1 / (D1+N)=20 is satisfied. Alternatively, L1 / (D1+N)=25 is satisfied. Alternatively, L1 / (D1+N)=30 is satisfied. Alternatively, L1 / (D1+N)=35 is satisfied, etc.

[0088] In the embodiment of the present application, the distance between the adjacent first collector electrode and the second collector electrode is set to N, and the distance between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11 is set to D1, satisfying N≤D1≤2N. Through the above settings, it can be ensured that the carriers at the edge of the solar cell can be fully collected to improve the photoelectric conversion efficiency of the solar cell.

[0089] Alternatively, if Figure 3 As shown, along the first direction A, the distance between two adjacent first collecting electrodes or second collecting electrodes located at the edge is N1, and the distance between two adjacent first collecting electrodes or second collecting electrodes located in the middle is N2, satisfying D1<N1<N2, and / or, 2D1>N1, or, 2D1>N2, or, 2N1>N2.

[0090] When arranging the first collector electrode and the second collector electrode, the distance between two adjacent collector electrodes can be set to be equal along the first direction A as in the above embodiment. It is also possible to set the distance between two adjacent collector electrodes to be unequal along the first direction A as in the embodiment of the present application, and the specific position of the unequal position can be selected according to actual needs. Exemplarily, the distance between the two adjacent collector electrodes located in the middle is equal, which is conducive to the uniform collection of carriers, and the distance between the two adjacent collector electrodes located at the edge is increased or reduced, so as to leave enough space for the distance D1 between the position of the graphic area 20 close to the first side 11 and the first side 11.

[0091] It should be noted that the solar cell in the embodiment of the present application can be a back contact solar cell or a double-sided contact solar cell. When the above-mentioned unequally spaced collector electrode design is applicable to a back contact battery, the distance between the three positive and negative collector electrodes located at the edge can be increased or decreased, so as to leave enough space for the distance D1 between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11.

[0092] Alternatively, if Figure 1 As shown, along the second direction B, the length of the battery cell body 10 is L2, and the distance between the position of the graphic area 20 close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 is D2; when the first collecting electrode and the second collecting electrode have opposite polarities, 150≤L2 / D2≤750 is satisfied; and / or, when the first collecting electrode and the second collecting electrode have the same polarity, 50≤L2 / D2≤650 is satisfied.

[0093] Along the second direction B, if the length L2 of the cell body 10 increases, the transmission resistance increases, and the fine grid becomes longer. Along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 needs to be adjusted. Along the second direction B, if the length L2 of the cell body 10 decreases, the shading increases, and the fine grid becomes shorter. Along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 also needs to be adjusted.

[0094] However, along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 is too close, the tolerance for electrode offset will be reduced, the difficulty of alignment will increase, and the fine grid yield will be reduced. Along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 is too far, and the carriers cannot be fully collected, resulting in current loss and reducing the photoelectric conversion efficiency of the solar cell.

[0095] By controlling the ratio of L2 / D2, the design requirements of D2 for cells of different sizes can be met. While taking into account the transmission resistance and shading loss, the difficulty of fine grid alignment and the carrier collection loss can be reduced, thereby improving the photoelectric conversion efficiency of the cell.

[0096] For back-contact solar cells, the positive and negative fine grids are both set on the back of the cell, and the distance between adjacent positive fine grids and adjacent negative fine grids is farther, and the carrier transmission distance is longer. Compared with double-sided contact solar cells, if L2 becomes larger, it will further increase the difficulty of carrier transmission.

[0097] Similarly, for back-contact solar cells, both the positive and negative fine grids are set on the back of the cell, and the shading loss will be greater. Compared with double-sided contact solar cells, if L2 becomes smaller, the shading loss will be further aggravated.

[0098] Therefore, for the back-contact solar cell and the double-sided contact solar cell, after L2 changes, the adjustment range of D2 is different. In order to overcome the above-mentioned aggravated loss, the D2 of the back-contact solar cell will be smaller and the ratio of L2 / D2 will be slightly larger.

[0099] like Figure 1 As shown, when the cell body 10 is a rectangular structure, the length of the cell body 10 is L2 along the second direction B. Along the second direction B, the distance between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 is set to D2.

[0100] It should be noted that in the embodiment of the present application, the position of the graphic area 20 close to the edge of the battery cell body 10 along the second direction B is the position of the end of the collector electrode close to the edge of the battery cell body 10 along the second direction B. And D2 is the distance between the end close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 along the second direction B.

[0101] When the polarities of the first collector electrode and the second collector electrode are opposite, that is, when the solar cell is a back-contact solar cell, 150≤L2 / D2≤750 is satisfied. In the embodiment of the present application, the ratio of the length L2 of the cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the cell body 10 and the same edge of the cell body 10 is set to be greater than or equal to 150 and less than or equal to 750. On the basis of taking into account the transmission resistance and the shading loss, the difficulty of fine grid alignment and the collection loss of carriers are reduced, thereby improving the yield and photoelectric conversion efficiency of the solar cell.

[0102] Exemplarily, when the polarities of the first collecting electrode and the second collecting electrode are opposite, the ratio of the length L2 of the battery cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 can be 150, 180, 200, 220, 240, 260, 280, 350, 400, 450, 500, 550, 600, 650, 700, 750, etc.

[0103] When the polarities of the first collector electrode and the second collector electrode are the same, that is, when the solar cell is a double-sided solar cell, 50≤L2 / D2≤650 is satisfied. In the embodiment of the present application, the ratio of the length L2 of the cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the cell body 10 and the same edge of the cell body 10 is set to be greater than or equal to 50 and less than or equal to 650. On the basis of taking into account the transmission resistance and the shading loss, the difficulty of fine grid alignment and the collection loss of carriers are reduced, thereby improving the yield and photoelectric conversion efficiency of the solar cell.

[0104] Exemplarily, when the polarity of the first collecting electrode and the second collecting electrode is the same, the ratio of the length L2 of the battery cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 can be 50, 70, 90, 110, 130, 150, 170, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, etc.

[0105] When the battery cell is a half-cell battery cell and the battery cell is a rectangular structure, illustratively, along the first direction A, the width L1 of the battery cell is 105.1 mm, and along the second direction B, the length L2 of the battery cell is 182.3 mm, the limit size is: L1 / D1=350, and / or, L2 / D2=607. It should be noted that L1 / D1 and L2 / D2 in the embodiment of the present application can be applied separately or simultaneously, and the same is true below and will not be repeated.

[0106] When the width L1 of the battery cell along the first direction A is 105.1 mm and the length L2 of the battery cell along the second direction B is 182.3 mm, the dimensions suitable for mass production are: L1 / D1=263, and / or, L2 / D2=456.

[0107] Alternatively, when the width L1 of the battery cell is 105.1 mm along the first direction A and the length L2 of the battery cell is 182.3 mm along the second direction B, the size of the slices during the battery manufacturing process or after the battery preparation is: L1 / D1=175, and / or, L2 / D2=304.

[0108] It should be noted that the dimensional tolerance of the battery cell in the above embodiment is within ±0.25 mm. In the embodiment of the present application, the dimensional tolerance of the battery cell is within ±0.25 mm.

[0109] Optionally, D1≥D2 is satisfied.

[0110] In the embodiment of the present application, the distance D1 between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11 is set to be greater than or equal to the distance D2 between the position of the graphic area 20 close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 along the second direction B. In other words, the distance D2 between the position of the graphic area 20 close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 along the second direction B is less than or equal to the distance D1 between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11. Through the above setting, it can be ensured that the edge of the solar cell has a suitable current collection area, ensuring the photoelectric conversion efficiency of the solar cell.

[0111] Optionally, when the battery cell body 10 is a rectangular structure or a quasi-rectangular structure, when the first collecting electrode and the second collecting electrode have opposite polarities, L1 / D1≤L2 / D2 is satisfied; and / or when the first collecting electrode and the second collecting electrode have the same polarity, L1 / D1≥L2 / D2 is satisfied.

[0112] When the cell body 10 is a rectangular structure or a quasi-rectangular structure, when the polarities of the first collector electrode and the second collector electrode are opposite, that is, when the solar cell is a back-contact solar cell, L1 / D1≤L2 / D2 is satisfied. When the cell body 10 is a rectangular structure or a quasi-rectangular structure, when the polarities of the first collector electrode and the second collector electrode are the same, that is, when the solar cell is a double-sided cell, L1 / D1≥L2 / D2 is satisfied.

[0113] It should be noted that if Figure 1 As shown, the quasi-rectangular structure in the embodiment of the present application means that the two ends of the first side 11 of the battery cell body 10 are connected with chamfers, and the chamfers can be circular chamfers or square chamfers. In this regard, there is no specific limitation in the embodiment of the present application, and in actual applications, technicians can set it as needed.

[0114] Optionally, 75 mm ≤ L1 ≤ 175 mm is satisfied; and / or, along the second direction B, the length of the battery cell body 10 is L2, which satisfies 150 mm ≤ L2 ≤ 350 mm; and / or, the area of ​​the battery cell body 10 is S, which satisfies 11250 mm 2 ≤S≤61250mm 2 .

[0115] like Figure 1 As shown, the battery cell body 10 in the embodiment of the present application is a rectangular structure. Along the first direction A, the width of the battery cell body 10 is L1, and along the second direction B, the length of the battery cell body 10 is L2.

[0116] Wherein, 75mm≤L1≤175mm is satisfied. For example, L1=75mm; or L1=80mm; or L1=100mm; or L1=125mm; or L1=150mm; or L1=175mm is satisfied.

[0117] Wherein, 150mm≤L2≤350mm is satisfied. For example, L2=150mm; or, L2=175mm; or, L2=200mm; or, L2=225mm; or, L2=250mm; or, L2=300mm; or, L2=350mm.

[0118] In the embodiment of the present application, the area of ​​the battery cell body 10 is S. When the battery cell body 10 is a rectangular structure, the area S is the product of the width L1 of the battery cell body 10 and the length L2 of the battery cell body 10. 2 ≤S≤61250mm 2 For example, S=11250 mm 2 ; or, satisfy S = 28125mm 2 ; or, satisfy S = 37500mm 2 ; or, satisfy S = 61250mm 2 .

[0119] Optionally, 50≤M≤225 is satisfied.

[0120] In the case where the solar cell is a back-contact solar cell, the number of the first collector electrodes in the graphic region 20 is M, or the number of the second collector electrodes M satisfies 50≤M≤225. There are enough collector electrodes in the graphic region 20 to ensure the current collection efficiency of the solar cell and improve the photoelectric conversion efficiency of the solar cell.

[0121] Exemplarily, M=50 is satisfied; or, M=100 is satisfied; or, M=150 is satisfied; or, M=175 is satisfied; or, M=200 is satisfied; or, M=225 is satisfied.

[0122] In the case where the solar cell is a double-sided solar cell, the sum of the number of the first collector electrode and the second collector electrode in the graphic region 20 is M, satisfying 50≤M≤225. There are enough collector electrodes in the graphic region 20 to ensure the current collection efficiency of the solar cell and improve the photoelectric conversion efficiency of the solar cell.

[0123] Exemplarily, M=50 is satisfied; or, M=75 is satisfied; or, M=125 is satisfied; or, M=150 is satisfied; or, M=200 is satisfied; or, M=225 is satisfied.

[0124] Reference Figure 4 , showing a schematic diagram of the structure of the busbar line of a solar cell in the prior art; referring to Figure 5 , showing a schematic diagram of the structure of the interconnection part of the solar cell in the prior art; referring to Figure 6 , showing a side view of stress distribution of welding strip in the prior art.

[0125] like Figures 4 to 6 As shown, in the prior art, a plurality of busbar lines are arranged on the surface of a solar cell, and the plurality of busbar lines extend along a first direction A and are arranged at intervals along a second direction B, and the distance between two adjacent busbar lines is equal along the second direction B. However, in the prior art, the arrangement of the busbar lines results in a low photoelectric conversion efficiency of the solar cell.

[0126] Reference Figure 7 , showing a schematic diagram of the structure of the busbar line of the solar cell in the embodiment of the present application; referring to Figure 8 , showing a schematic diagram of the structure of the interconnection portion of the solar cell in the embodiment of the present application; Fig. 9 , shows a side view of the stress distribution of the welding strip in an embodiment of the present application.

[0127] like Figures 7 to 9 As shown, in the solar cell disclosed in the embodiment of the present application, the surface of the cell body 10 is provided with a plurality of bus bars 30 extending along a first direction A and arranged at intervals along a second direction B, wherein along the second direction B, there is a first distance a between two adjacent bus bars 30 close to the edge of the cell body 10, and there is a second distance b between two adjacent bus bars 30 relatively far from the edge of the cell body 10, satisfying a>b, so as to improve the carrier collection efficiency, reduce current adaptation, and avoid the problem of chip cracking caused by edge welding.

[0128] The busbar line 30 in the embodiment of the present application is connected to the collector electrode, and the collector electrode collects the current generated by the battery cell body 10. The busbar line 30 collects and transmits the current collected by the collector electrode. Among them, the busbar line 30 can be set on the front side of the battery cell body 10, and can also be set on the back side of the battery cell body 10. In this regard, the embodiment of the present application does not make specific restrictions. In actual applications, technicians can set it as needed.

[0129] It should be noted that the bus bar line 30 is conductive.

[0130] like Figures 7 to 9As shown, in the embodiment of the present application, along the second direction B, the distance between two adjacent busbar lines 30 close to the edge of the battery cell body 10 is set to a first distance a, and the distance between two adjacent busbar lines 30 relatively far from the edge of the battery cell body 10 is set to a second distance b. It can be understood that along the second direction B, the first distance a is closer to the side of the battery cell body 10 than the second distance b. Among them, the first distance a is greater than the second distance b.

[0131] In the embodiment of the present application, along the second direction B, the distance between two adjacent busbar lines 30 close to the edge of the cell body 10 is set to a first distance a, and the distance between two adjacent busbar lines 30 relatively far from the edge of the cell body 10 is set to a second distance b, and the first distance a is set to be greater than the second distance b. This improves the carrier collection efficiency, reduces current adaptation, and avoids the cracking problem caused by edge welding.

[0132] Optionally, 0<ab≤5mm is satisfied; and / or, 15mm≤a≤25mm and 15mm≤b≤25mm are satisfied.

[0133] In the embodiment of the present application, along the second direction B, the difference between the first distance a between two adjacent busbar lines 30 relatively close to the edge of the cell body 10 and the second distance b between two adjacent busbar lines 30 relatively far from the edge of the cell body 10 is set to be greater than 0 mm and less than or equal to 5 mm, so as to balance the current collection and improve the photoelectric conversion efficiency of the solar cell.

[0134] Exemplarily, the difference between the first distance a and the second distance b may be set to 1 mm, 2 mm, 3 mm, 4 mm, etc.

[0135] It should be noted that, in the embodiment of the present application, there are no excessive restrictions on the specific lengths of the first distance a and the second distance b, as long as the second distance b is greater than the first distance a. In actual applications, technicians can set specific values ​​of the second distance b and the first distance a as needed.

[0136] In the embodiment of the present application, the first distance a between two adjacent busbar lines 30 near the edge of the battery cell body 10 is set to be greater than or equal to 15 mm and less than or equal to 25 mm along the second direction B. For example, the first distance a can be 15 mm, 17 mm, 19 mm, 21 mm, 23 mm, 25 mm, etc.

[0137] In the embodiment of the present application, along the second direction B, the second distance b between two adjacent busbar lines 30 relatively far from the edge of the battery cell body 10 is also set to be greater than or equal to 15 mm and less than or equal to 25 mm. For example, the second distance b can be 15 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 25 mm, etc.

[0138] For example, when the first distance a is 20 mm, the second distance b may be 15 mm. When the first distance a is 22 mm, the second distance b may be 17 mm.

[0139] Alternatively, if Figures 7 to 9 As shown, along the first direction A, the busbar line 30 includes an interconnection portion 31 and a connection line 32 , wherein the interconnection portion 31 includes a plurality of interconnections 31 , the plurality of interconnections 31 are arranged at intervals, and the connection line 32 is electrically connected to the plurality of interconnections 31 .

[0140] like Figures 7 to 9 As shown, the busbar line 30 in the embodiment of the present application includes a plurality of interconnecting portions 31, and the plurality of interconnecting portions 31 are arranged at intervals along the first direction A. The plurality of interconnecting portions 31 are electrically connected by connecting wires 32 to form the busbar line 30. The busbar line 30 collects the current generated by the battery cell body 10.

[0141] It should be noted that in the embodiment of the present application, the welding ribbon 40 is connected to the surface of the battery cell body 10 through the interconnection part 31 to collect and transmit the current generated by the battery cell body 10. Exemplarily, the welding ribbon 40 can be welded to the interconnection part 31.

[0142] like Figure 2 As shown, the embodiment of the present application also discloses a solar cell, which includes two solar cells described in the above embodiment. It can be understood that the solar cell in the above embodiment is the smallest unit of the solar cell, and the solar cell in the embodiment of the present application includes two solar cells of the above smallest unit.

[0143] Exemplarily, the solar cell in the above embodiment is a half-cell solar cell, while the solar cell in the embodiment of the present application includes two half-cell solar cells, that is, the solar cell in the embodiment of the present application is a whole solar cell. Optionally, L1 corresponds to the short side of the half-cell, and L2 corresponds to the long side of the cell; L1 corresponds to the long side of the whole cell, and L2 corresponds to the short side of the whole cell.

[0144] like Figure 2 As shown, the solar cell in the embodiment of the present application also includes two graphic regions 20, and the two graphic regions 20 are arranged along the first direction A at intervals in one solar cell.

[0145] It can be understood that in the solar cell disclosed in the embodiment of the present application, the width of the cell body is L1 along the first direction A, and the length of the cell body is L2 along the second direction B. The number of the first collector electrodes and / or the second collector electrodes in the graphic area 20 is M.

[0146] It should be noted that the specific parameters of the solar cell in the embodiment of the present application are not described in detail here. The specific parameters of the solar cell in the embodiment of the present application are set with reference to the above embodiment.

[0147] In addition, the solar cell included in the solar cell disclosed in the embodiment of the present application has the same structure as the solar cell disclosed in the above embodiment, and its beneficial effects are also similar, which will not be described in detail here.

[0148] Alternatively, if Figure 2 As shown, when the polarities of the first collecting electrode and the second collecting electrode are opposite, the number of the first collecting electrode or the second collecting electrode is M, satisfying 0.9≤M / L1≤1.8; or, when the polarities of the first collecting electrode and the second collecting electrode are the same, the sum of the numbers of the first collecting electrode and the second collecting electrode is M, satisfying 0.9≤M / L1≤1.8.

[0149] When the polarities of the first collector electrode and the second collector electrode are opposite, that is, two electrodes with opposite polarities are arranged on the surface of the solar cell. The solar cell is a back contact solar cell. The number of the first collector electrodes is M, or the number of the second collector electrodes M satisfies 0.9≤M / L1≤1.8.

[0150] In the embodiment of the present application, by setting the ratio of the number M of the first collecting electrodes or the second collecting electrodes to the width L1 of the battery cell body 10 to be greater than or equal to 0.9 and less than or equal to 1.8, the surface of the battery cell body 10 has enough collecting electrodes, thereby ensuring the current collection efficiency of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0151] Exemplarily, when the polarities of the first collector electrode and the second collector electrode are opposite, along the first direction A, the width of the battery cell body 10 is L1, the number of the first collector electrodes is M, and M / L1=0.9 is satisfied. Alternatively, M / L1=1.2 is satisfied. When the polarities of the first collector electrode and the second collector electrode are opposite, along the first direction A, the width of the battery cell body 10 is L1, the number of the second collector electrodes is M, and M / L1=1.5 is satisfied. Alternatively, M / L1=1.8 is satisfied.

[0152] It should be noted that when the polarities of the first collecting electrode and the second collecting electrode are opposite, that is, when the solar cell is a back-contact solar cell, if the number of the first collecting electrode and the second collecting electrode is not equal, the number of M shall be based on the larger number of the first collecting electrode or the second collecting electrode.

[0153] When the polarity of the first collector electrode and the second collector electrode is the same, that is, only one polarity electrode is provided on the surface of the solar cell. The solar cell is a double-sided solar cell. The sum of the number of the first collector electrode and the second collector electrode is M, which satisfies 0.9≤M / L1≤1.8.

[0154] In the embodiment of the present application, by setting the ratio of the sum M of the number of the first collecting electrodes and the second collecting electrodes to the width L1 of the battery cell body 10 to be greater than or equal to 0.9 and less than or equal to 1.8, the surface of the battery cell body 10 has enough collecting electrodes, thereby ensuring the current collection efficiency of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0155] For example, when the polarities of the first collector electrode and the second collector electrode are the same, along the first direction A, the width of the battery cell body 10 is L1, and the sum of the number of the first collector electrode and the second collector electrode is M, which satisfies M / L1=0.9. Alternatively, M / L1=1.25. Alternatively, M / L1=1.5. Alternatively, M / L1=1.8.

[0156] Preferably, when the polarities of the first collector electrode and the second collector electrode are opposite, 0.93≤M / L1≤1.5 is satisfied; or, when the polarities of the first collector electrode and the second collector electrode are the same, 0.93≤M / L1≤1.5 is satisfied. This allows the surface of the cell body 10 to have enough collector electrodes, thereby ensuring the current collection efficiency of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0157] Alternatively, if Figure 2 As shown, the battery cell body 10 includes a chamfer, both ends of the first side 11 are directly connected to the chamfer, and both ends of the second side 12 are directly connected to the chamfer; the graphic area 20 includes two, and the two graphic areas 20 are arranged at intervals along the first direction A, and the distance between the two graphic areas 20 is D3, satisfying 0.5≤D3:2D1≤1.

[0158] like Figure 2As shown, in the embodiment of the present application, along the first direction A, the distance between the two graphic regions 20 is set to D3, where 0.5≤D3:2D1≤1. Through the above setting, the area of ​​the graphic region 20 can be increased, and the position of the graphic region 20 can be clarified, so as to maximize the use of the surface area of ​​the cell body 10 to improve the photoelectric conversion efficiency of the solar cell.

[0159] Furthermore, the portion between the two graphic regions 20 may be partially damaged after being cut and sliced ​​after forming the battery, so D3:2D1 is set to be less than or equal to 1. However, D3 cannot be too small, as a too small D3 will affect the collection area of ​​carriers. Therefore, in the embodiment of the present application, D3:2D1 is set to be greater than or equal to 0.5.

[0160] Exemplarily, D3:2D1=0.5 is satisfied; or, D3:2D1=0.7; or, D3:2D1=0.9; or, D3:2D1=1 is satisfied.

[0161] It should be noted that, in the embodiment of the present application, the distance D3 between two graphic areas 20 refers to the distance between the collecting electrode in one graphic area 20 that is closest to the other graphic area 20 and the collecting electrode in the other graphic area 20 that is closest to the graphic area 20.

[0162] Optionally, when the polarities of the first collecting electrode and the second collecting electrode are opposite, in the same graphic area, along the first direction A, the distance between adjacent first collecting electrodes and second collecting electrodes is N, satisfying 11.00≤L1 / (D1+N)≤37.02; and / or, satisfying N≤D1≤2N.

[0163] When the polarities of the first collector electrode and the second collector electrode are opposite, that is, when the solar cell is a back-contact solar cell, the back of the cell body 10 has a plurality of first collector electrodes and a plurality of second collector electrodes. The plurality of first collector electrodes and the plurality of second collector electrodes extend along the second direction B and are alternately arranged on the back of the cell body 10 along the first direction A. Along the first direction A, the distance between adjacent first collector electrodes and second collector electrodes is N, satisfying 11.00≤L1 / (D1+N)≤37.02.

[0164] Through the above arrangement, the probability of successful alignment of the electrode pattern of the back contact solar cell can be improved, the transmission resistance can be reduced, and the photoelectric conversion efficiency of the solar cell can be improved.

[0165] For example, L1 / (D1+N)=11.00 is satisfied. Alternatively, L1 / (D1+N)=15 is satisfied. Alternatively, L1 / (D1+N)=20 is satisfied. Alternatively, L1 / (D1+N)=25 is satisfied. Alternatively, L1 / (D1+N)=30 is satisfied. Alternatively, L1 / (D1+N)=35 is satisfied, etc.

[0166] In the embodiment of the present application, the distance between the adjacent first collector electrode and the second collector electrode is set to N, and the distance between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11 is set to D1, satisfying N≤D1≤2N. Through the above settings, it can be ensured that the carriers at the edge of the solar cell can be fully collected to improve the photoelectric conversion efficiency of the solar cell.

[0167] Alternatively, if Figure 3 As shown, in the same graphic area 20, along the first direction A, the distance between two adjacent first collecting electrodes or second collecting electrodes located in the edge area is N1, and the distance between two adjacent first collecting electrodes or second collecting electrodes located in the middle area is N2, satisfying D1<N1<N2, and / or, 2D1>N1, or, 2D1>N2, or, 2N1>N2.

[0168] When arranging the first collector electrode and the second collector electrode, as in the above embodiment, the distance between two adjacent collector electrodes can be set to be equal along the first direction A. Alternatively, as in the embodiment of the present application, the distance between two adjacent collector electrodes along the first direction A can be set to be unequal, and the specific position of the unequal position can be selected according to actual needs.

[0169] Exemplarily, within the same graphic area 20, the distance between two adjacent collecting electrodes located in the middle area is equal, which is conducive to the uniform collection of carriers, and the distance between two adjacent collecting electrodes located at the edge is reduced, so as to leave sufficient space for the distance D1 between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11.

[0170] Alternatively, if Figure 2 As shown, along the second direction B, the length of the battery cell body 10 is L2, and the distance between the position of the graphic area 20 close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 is D2; when the polarities of the first collecting electrode and the second collecting electrode are opposite, 150≤L2 / D2≤750 is satisfied; and / or, when the polarities of the first collecting electrode and the second collecting electrode are the same, 50≤L2 / D2≤650 is satisfied.

[0171] Along the second direction B, if the length L2 of the cell body 10 increases, the transmission resistance increases, and the fine grid becomes longer. Along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 needs to be adjusted. Along the second direction B, if the length L2 of the cell body 10 decreases, the shading increases, and the fine grid becomes shorter. Along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 also needs to be adjusted.

[0172] However, along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 is too close, the tolerance for electrode offset will be reduced, the difficulty of alignment will increase, and the fine grid yield will be reduced. Along the second direction B, the distance D2 between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 is too far, and the carriers cannot be fully collected, resulting in current loss and reducing the photoelectric conversion efficiency of the solar cell.

[0173] By controlling the ratio of L2 / D2, the design requirements of D2 for cells of different sizes can be met. While taking into account the transmission resistance and shading loss, the difficulty of fine grid alignment and the carrier collection loss can be reduced, thereby improving the photoelectric conversion efficiency of the cell.

[0174] For back-contact solar cells, the positive and negative fine grids are both set on the back of the cell, and the distance between adjacent positive fine grids and adjacent negative fine grids is farther, and the carrier transmission distance is longer. Compared with double-sided contact solar cells, if L2 becomes larger, it will further increase the difficulty of carrier transmission.

[0175] Similarly, for back-contact solar cells, both the positive and negative fine grids are set on the back of the cell, and the shading loss will be greater. Compared with double-sided contact solar cells, if L2 becomes smaller, the shading loss will be further aggravated.

[0176] Therefore, for the back-contact solar cell and the double-sided contact solar cell, after L2 changes, the adjustment range of D2 is different. In order to overcome the above-mentioned aggravated loss, the D2 of the back-contact solar cell will be smaller and the ratio of L2 / D2 will be slightly larger.

[0177] like Figure 2 As shown, when the cell body 10 is a rectangular structure, the length of the cell body 10 is L2 along the second direction B. Along the second direction B, the distance between the position of the graphic area 20 close to the edge of the cell body 10 and the same edge of the cell body 10 is set to D2.

[0178] It should be noted that in the embodiment of the present application, the position of the graphic area 20 close to the edge of the battery cell body 10 along the second direction B is the position of the end of the collector electrode close to the edge of the battery cell body 10 along the second direction B. And D2 is the distance between the end close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 along the second direction B.

[0179] When the polarities of the first collector electrode and the second collector electrode are opposite, that is, when the solar cell is a back-contact solar cell, 150≤L2 / D2≤750 is satisfied. In the embodiment of the present application, the ratio of the length L2 of the cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the cell body 10 and the same edge of the cell body 10 is set to be greater than or equal to 150 and less than or equal to 750. On the basis of taking into account the difficulty of carrier transmission and electrode shielding loss, at the same time, the difficulty of electrode alignment and the risk of electrode overlap are reduced, thereby improving the yield and photoelectric conversion efficiency of solar cells.

[0180] Exemplarily, when the polarities of the first collecting electrode and the second collecting electrode are opposite, the ratio of the length L2 of the battery cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 can be 150, 180, 200, 220, 240, 260, 280, 350, 400, 450, 500, 550, 600, 650, 700, 750, etc.

[0181] When the polarities of the first collector electrode and the second collector electrode are the same, that is, when the solar cell is a double-sided solar cell, 50≤L2 / D2≤650 is satisfied. In the embodiment of the present application, the ratio of the length L2 of the cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the cell body 10 and the same edge of the cell body 10 is set to be greater than or equal to 50 and less than or equal to 650. On the basis of taking into account the difficulty of carrier transmission and electrode shielding loss, at the same time, the difficulty of electrode alignment and the risk of electrode overlap are reduced, thereby improving the yield and photoelectric conversion efficiency of solar cells.

[0182] Exemplarily, when the polarity of the first collecting electrode and the second collecting electrode is the same, the ratio of the length L2 of the battery cell body 10 and the distance D2 between the position of the graphic area 20 along the second direction B close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 can be 50, 70, 90, 110, 130, 150, 170, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, etc.

[0183] When the battery cell is a whole battery cell and the battery cell is a rectangular structure, illustratively, along the first direction A, the width L1 of the battery cell is 210 mm, and along the second direction B, the length L2 of the battery cell is 182.2 mm, the limit size is: L1 / D1=210 / 2 / 0.3=350, and / or, L2 / D2=182.2 / 0.3=607. It should be noted that L1 / D1 and L2 / D2 in the embodiment of the present application can be applied separately or simultaneously, and the same is true below and will not be repeated.

[0184] When the width L1 of the battery cell along the first direction A is 210 mm and the length L2 of the battery cell along the second direction B is 182.2 mm, the dimensions suitable for mass production are: L1 / D1=210 / 2 / 0.4=263, and / or, L2 / D2=182.2 / 0.4=456.

[0185] Alternatively, when the width L1 of the battery cell is 210 mm along the first direction A and the length L2 of the battery cell is 182.2 mm along the second direction B, the size of the slice during the battery manufacturing process or after the battery preparation is: L1 / D1=210 / 2 / 0.6=175, and / or, L2 / D2=182.2 / 0.6=304.

[0186] It should be noted that the dimensional tolerance of the battery cell in the above embodiment is within ±0.25 mm. In the embodiment of the present application, the dimensional tolerance of the battery cell is within ±0.25 mm.

[0187] Optionally, D1≥D2 is satisfied.

[0188] In the embodiment of the present application, the distance D1 between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11 is set to be greater than or equal to the distance D2 between the position of the graphic area 20 close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 along the second direction B. In other words, the distance D2 between the position of the graphic area 20 close to the edge of the battery cell body 10 and the same edge of the battery cell body 10 along the second direction B is less than or equal to the distance D1 between the position of the graphic area 20 close to the first side edge 11 and the first side edge 11. Through the above setting, it can be ensured that the edge of the solar cell has a suitable current collection area, ensuring the photoelectric conversion efficiency of the solar cell.

[0189] Alternatively, if Figure 2 As shown, when the battery cell body 10 is a rectangular structure or a quasi-rectangular structure, when the polarities of the first collecting electrode and the second collecting electrode are opposite, L1 / 2D1≤L2 / D2 is satisfied; and / or, when the polarities of the first collecting electrode and the second collecting electrode are the same, L1 / 2D1≥L2 / D2 is satisfied.

[0190] When the cell body 10 is a rectangular structure or a quasi-rectangular structure, when the polarities of the first collector electrode and the second collector electrode are opposite, that is, when the solar cell is a back-contact solar cell, L1 / 2D1≤L2 / D2 is satisfied. When the cell body 10 is a rectangular structure or a quasi-rectangular structure, when the polarities of the first collector electrode and the second collector electrode are the same, that is, when the solar cell is a double-sided cell, L1 / 2D1≥L2 / D2 is satisfied.

[0191] It should be noted that if Figure 2 As shown, the quasi-rectangular structure in the embodiment of the present application means that the two ends of the first side 11 of the battery cell body 10 are connected with chamfers, and the two ends of the second side 12 of the battery cell body 10 are connected with chamfers. The chamfers can be circular chamfers or square chamfers. In this regard, there is no specific limitation in the embodiment of the present application. In actual applications, technicians can set it as needed.

[0192] Optionally, 75 mm ≤ L1 / 2 ≤ 175 mm is satisfied; and / or, along the second direction B, the length of the battery cell body 10 is L2, which satisfies 150 mm ≤ L2 ≤ 350 mm; and / or, the area of ​​the battery cell body 10 is S, which satisfies 11250 mm 2 ≤S / 2≤61250mm 2 .

[0193] like Figure 2 As shown, the battery cell body 10 in the embodiment of the present application is a rectangular structure. Along the first direction A, the width of the battery cell body 10 is L1, and along the second direction B, the length of the battery cell body 10 is L2.

[0194] Wherein, 75mm≤L1 / 2≤175mm is satisfied. For example, L1 / 2=75mm; or, L1 / 2=80mm; or, L1 / 2=100mm; or, L1 / 2=125mm; or, L1 / 2=150mm; or, L1 / 2=175mm.

[0195] Wherein, 150mm≤L2≤350mm is satisfied. For example, L2=150mm; or, L2=175mm; or, L2=200mm; or, L2=225mm; or, L2=250mm; or, L2=300mm; or, L2=350mm.

[0196] In the embodiment of the present application, the area of ​​the battery cell body 10 is S. When the battery cell body 10 is a rectangular structure, the area S is the product of the width L1 of the battery cell body 10 and the length L2 of the battery cell body 10.2 ≤S / 2≤61250mm 2 For example, S / 2=11250 mm 2 ; or, satisfy S / 2=28125mm 2 ; or, satisfy S / 2=37500mm 2 ; or, satisfy S / 2=61250mm 2 .

[0197] Optionally, 50≤M / 2≤225 is satisfied.

[0198] In the case where the solar cell is a back-contact solar cell, the number of the first collector electrodes in the graphic region 20 is M, or the number of the second collector electrodes M satisfies 50≤M / 2≤225. There are enough collector electrodes in the graphic region 20 to ensure the current collection efficiency of the solar cell and improve the photoelectric conversion efficiency of the solar cell.

[0199] It should be noted that the number of collecting electrodes M in the embodiment of the present application refers to the number of all collecting electrodes in two graphic areas 20 on the entire battery cell. It can be understood that the number of collecting electrodes in one graphic area 20 is M / 2.

[0200] Exemplarily, M / 2=50 is satisfied; or, M / 2=100 is satisfied; or, M / 2=150 is satisfied; or, M / 2=175 is satisfied; or, M / 2=200 is satisfied; or, M / 2=225 is satisfied.

[0201] In the case where the solar cell is a double-sided solar cell, the sum of the number of the first collector electrode and the second collector electrode in the graphic region 20 is M, satisfying 50≤M / 2≤225. There are enough collector electrodes in the graphic region 20, thereby ensuring the current collection efficiency of the solar cell and improving the photoelectric conversion efficiency of the solar cell.

[0202] Exemplarily, M / 2=50 is satisfied; or, M / 2=75 is satisfied; or, M / 2=125 is satisfied; or, M / 2=150 is satisfied; or, M / 2=200 is satisfied; or, M / 2=225 is satisfied.

[0203] The embodiment of the present application further discloses a photovoltaic module, which includes a plurality of solar cells as described in the above embodiment, wherein the plurality of solar cells are arranged at intervals.

[0204] It should be noted that in the embodiment of the present application, 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 repeated here.

[0205] 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.

[0206] Although the optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the present application.

[0207] 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.

[0208] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A solar cell, characterized in that: include: A battery cell body, wherein the width of the battery cell body along the first direction is L1; A graphic region, the graphic region is arranged on the surface of the battery cell body, the graphic region has a plurality of collector electrodes extending along a second direction, the collector electrodes include a first collector electrode and a second collector electrode, the first collector electrode and the second collector electrode are arranged at intervals along the first direction; wherein the second direction is different from the first direction; The battery cell body has a first side and a second side that are oppositely arranged, the first side and the second side include a portion extending along the second direction, and the distance between the position of the graphic area close to the first side and the first side is D1; When the polarities of the first collector electrode and the second collector electrode are opposite, 80≤L1 / D1≤400 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, 50≤L1 / D1≤350 is satisfied.

2. The solar cell according to claim 1, characterized in that: When the polarities of the first collector electrode and the second collector electrode are opposite, the number of the first collector electrode or the second collector electrode is M, and 0.9≤M / L1≤1.8 is satisfied; And / or, when the first collecting electrode and the second collecting electrode have the same polarity, the sum of the number of the first collecting electrodes and the number of the second collecting electrodes is M, satisfying 0.9≤M / L1≤1.

8.

3. The solar cell according to claim 2, characterized in that: When the polarities of the first collector electrode and the second collector electrode are opposite, 0.93≤M / L1≤1.5 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, 0.93≤M / L1≤1.5 is satisfied.

4. The solar cell according to claim 1 or 2, characterized in that: The battery cell body further comprises a chamfer, and two ends of the first side are directly connected to the chamfer; Along the first direction, a distance between a position of the graphic area close to the second side and the second side is D3, satisfying 0.5≤D3:D1≤1.

5. The solar cell according to claim 1, characterized in that: When the polarities of the first collector electrode and the second collector electrode are opposite, along the first direction, the distance between the adjacent first collector electrode and the second collector electrode is N, satisfying 11.00≤L1 / (D1+N)≤37.02; And / or, N≤D1≤2N is satisfied.

6. The solar cell according to claim 5, characterized in that: Along the first direction, the distance between two adjacent first collecting electrodes or the second collecting electrodes located at the edge is N1, and the distance between two adjacent first collecting electrodes or the second collecting electrodes located in the middle is N2, satisfying D1<N1<N2, and / or, 2D1>N1, or, 2D1>N2, or, 2N1>N2.

7. The solar cell according to claim 1, characterized in that: Along the second direction, the length of the battery cell body is L2, and the distance between the position of the graphic area close to the edge of the battery cell body and the same edge of the battery cell body is D2; When the polarities of the first collector electrode and the second collector electrode are opposite, 150≤L2 / D2≤750 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, 50≤L2 / D2≤650 is satisfied.

8. The solar cell according to claim 7, characterized in that: Satisfies D1≥D2.

9. The solar cell according to claim 7, characterized in that: When the battery cell body is a rectangular structure or a quasi-rectangular structure, When the polarities of the first collector electrode and the second collector electrode are opposite, L1 / D1≤L2 / D2 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, L1 / D1≥L2 / D2 is satisfied.

10. The solar cell according to claim 1, characterized in that: Meet 75mm≤L1≤175mm; and / or, along the second direction, the length of the battery cell body is L2, satisfying 150 mm ≤ L2 ≤ 350 mm; And / or, the area of ​​the battery cell body is S, which satisfies 11250mm 2 ≤S≤61250mm 2 .

11. The solar cell according to claim 2, characterized in that: Satisfies 50≤M≤225.

12. A solar cell, characterized in that: include: A battery cell body, wherein the width of the battery cell body along the first direction is L1; A graphic region, the graphic region is arranged on the surface of the battery cell body, the graphic region includes two graphic regions, the two graphic regions are arranged at intervals along the first direction, the graphic region has a plurality of collector electrodes extending along the second direction, the collector electrodes include a first collector electrode and a second collector electrode, the first collector electrode and the second collector electrode are arranged at intervals along the first direction; wherein the second direction is different from the first direction; The battery cell body has a first side and a second side that are oppositely arranged, the first side and the second side include a portion extending along the second direction, and the distance between the position of the graphic area close to the first side and the first side, and the distance between the position of the graphic area close to the second side and the second side are both D1; When the polarities of the first collector electrode and the second collector electrode are opposite, 80≤L1 / 2D1≤400 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, 50≤L1 / 2D1≤350 is satisfied.

13. The solar cell according to claim 12, characterized in that: When the polarities of the first collector electrode and the second collector electrode are opposite, the number of the first collector electrode or the second collector electrode is M, and 0.9≤M / L1≤1.8 is satisfied; And / or, when the first collecting electrode and the second collecting electrode have the same polarity, the sum of the number of the first collecting electrodes and the number of the second collecting electrodes is M, satisfying 0.9≤M / L1≤1.

8.

14. The solar cell according to claim 13, characterized in that: When the polarities of the first collector electrode and the second collector electrode are opposite, 0.93≤M / L1≤1.5 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, 0.93≤M / L1≤1.5 is satisfied.

15. The solar cell according to claim 12, characterized in that: The battery cell body further includes a chamfer, two ends of the first side are directly connected to the chamfer, and two ends of the second side are directly connected to the chamfer; Along the first direction, the distance between the two graphic areas is D3, satisfying 0.5≤D3:2D1≤1.

16. The solar cell according to claim 15, characterized in that: When the polarities of the first collector electrode and the second collector electrode are opposite, in the same graphic region, along the first direction, the distance between the adjacent first collector electrode and the second collector electrode is N, satisfying 11.00≤L1 / 2(D1+N)≤37.02; And / or, N≤D1≤2N is satisfied.

17. The solar cell according to claim 16, characterized in that: In the same graphic area, along the first direction, the distance between two adjacent first collecting electrodes or the second collecting electrodes located in the edge area is N1, and the distance between two adjacent first collecting electrodes or the second collecting electrodes located in the middle area is N2, satisfying D1<N1<N2, and / or, 2D1>N1, or, 2D1>N2, or, 2N1>N2.

18. The solar cell according to claim 12, characterized in that: Along the second direction, the length of the battery cell body is L2, and the distance between the position of the graphic area close to the edge of the battery cell body and the same edge of the battery cell body is D2; When the polarities of the first collector electrode and the second collector electrode are opposite, 150≤L2 / D2≤750 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, 50≤L2 / D2≤650 is satisfied.

19. The solar cell according to claim 18, characterized in that: Satisfies D1≥D2.

20. The solar cell according to claim 18, characterized in that: When the battery cell body is a rectangular structure or a quasi-rectangular structure, When the polarities of the first collector electrode and the second collector electrode are opposite, L1 / 2D1≤L2 / D2 is satisfied; And / or, when the first collector electrode and the second collector electrode have the same polarity, L1 / 2D1≥L2 / D2 is satisfied.

21. The solar cell according to claim 12, characterized in that: Meet 75mm≤L1 / 2≤175mm; and / or, along the second direction, the length of the battery cell body is L2, satisfying 150 mm ≤ L2 ≤ 350 mm; And / or, the area of ​​the battery cell body is S, which satisfies 11250mm 2 ≤S / 2≤61250mm 2 .

22. The solar cell according to claim 13, characterized in that: Satisfies 50≤M / 2≤225.

23. A photovoltaic module, characterized in that: It comprises a plurality of solar cells according to any one of claims 1 to 22, wherein the plurality of solar cells are arranged at intervals.

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