Photovoltaic cell, half-cell photovoltaic cell

Abstract

The application relates to a photovoltaic cell and a half-piece photovoltaic cell. The photovoltaic cell comprises a cell body and a plurality of grid line units arranged on the cell body, the plurality of grid line units are sequentially arranged along a first direction, each grid line unit comprises a plurality of grid lines sequentially and uniformly arranged along the first direction; the distance between two adjacent grid line units is less than the interval between two adjacent grid lines in the same grid line unit. When the photovoltaic cell is cut, the cutting is performed from the middle of two adjacent grid line units. Since the distance between the two adjacent grid line units is less than the interval between two adjacent grid lines in the same grid line unit, that is, the distance between the two adjacent grid line units is reduced, the cutting interval is less than half of the grid line interval, the current collection capacity of the edge region of the cell is enhanced, the current transmission series resistance is reduced, the filling factor of the half-cell is improved, and the efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell technology, and in particular to photovoltaic cells and half-cell photovoltaic cells. Background Technology

[0002] The use of half-cell photovoltaic (PV) cells in photovoltaic (PV) modules has become the mainstream design in the industry. The core reason is that it significantly improves module output power, reduces losses, and enhances reliability. Half-cell technology uses lasers to cut a standard PV cell in half, and when connected in series, the operating current of each half-cell is halved. According to Joule's law (P... loss =I²R), halving the current I can reduce the resistance loss P. loss The current is reduced to 1 / 4 of the original, thereby effectively improving the output power of the module. Especially when the silicon wafer size increases (such as 182mm*210mm), the current of a full-cell cell is higher, and the resistance loss problem is more significant, while half-cell technology can effectively alleviate this problem.

[0003] In related technologies, the grid line distribution is designed based on the whole cell. After the cell is cut in half, the number of grid lines is halved, while the grid line spacing remains unchanged. At this time, the distance between the cutting edge and the nearest grid line (hereinafter referred to as the cutting spacing) is half of the grid line spacing. However, the current collection path under this cutting spacing is not optimal. Utility Model Content

[0004] Therefore, it is necessary to provide a photovoltaic cell, specifically a half-cell photovoltaic cell, to address the issue that the current collection path is not optimal under the cutting spacing after the cell is cut in half.

[0005] A photovoltaic cell includes a cell body and a plurality of grid line units disposed on the cell body, wherein the plurality of grid line units are arranged sequentially along a first direction, and each grid line unit includes a plurality of grid lines arranged sequentially and uniformly along the first direction.

[0006] The distance between two adjacent gate line units is less than the spacing between two adjacent gate lines in the same gate line unit.

[0007] In one embodiment, the spacing between two adjacent gate line units is greater than or equal to 0.1 mm.

[0008] In one embodiment, the front side of the battery body is provided with a plurality of grid line units, and the distance between two adjacent grid line units on the front side is less than the spacing between two adjacent grid lines in the same grid line unit on the front side.

[0009] And / or, the back of the battery body is provided with a plurality of grid line units, and the distance between two adjacent grid line units on the back is less than the spacing between two adjacent grid lines in the same grid line unit on the back.

[0010] In one embodiment, the front side of the battery body is provided with a plurality of grid line units, and the width of the grid lines on the front side is 5μm-20μm;

[0011] And / or, the back of the battery body is provided with a plurality of grid line units, and the width of the grid lines on the back is 20μm-30μm.

[0012] In one embodiment, a cutting line is provided between two adjacent grid line units.

[0013] In one embodiment, each of the gate line units is equidistant from the cut line.

[0014] In one embodiment, the number of gate lines in each gate line unit is equal.

[0015] In one embodiment, the half-cell photovoltaic cell includes a half-cell body and a plurality of grid lines disposed on the half-cell body. The plurality of grid lines are arranged sequentially and uniformly along a first direction. The plurality of grid lines include edge grid lines disposed at both ends of the half-cell body along the first direction and a middle grid line located between the two edge grid lines. The half-cell body has two sides disposed opposite to each other along the first direction. The two edge grid lines are disposed one-to-one with the two sides.

[0016] Wherein, the distance between at least one of the edge grid lines and the corresponding side edge is less than half the distance between two adjacent grid lines.

[0017] In one embodiment, the half-cell photovoltaic cell has a cut surface perpendicular to the first direction, one side of which is located on the cut surface, and a passivation layer is disposed on the cut surface.

[0018] In one embodiment, the distance from each edge grid line to the corresponding side is greater than or equal to 0.05 mm.

[0019] In the aforementioned photovoltaic cells and half-cell photovoltaic cells, the cutting is performed between two adjacent grid units. The minimum distance between the cut edge of the halved cell and the nearest grid line along the first direction is referred to as the cutting spacing. Since the distance between two adjacent grid units is less than the spacing between two adjacent grid lines in the same grid unit, the cutting spacing is less than half of the grid line spacing. This enhances the current collection capability of the cell edge region, reduces the series resistance of current transmission, and improves the fill factor of the half-cell, thereby achieving the goal of efficiency improvement. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a photovoltaic cell in one embodiment.

[0021] Figure 2 This is a schematic diagram of the structure of a half-cell photovoltaic cell in one embodiment.

[0022] Reference numerals: 100, photovoltaic cell; 110, first cell; 120, second cell; 130, half-cell photovoltaic cell; 131, side; 132, cut surface; 133, half-cell body; 200, cell body; 300, grid line unit; 310, first grid line unit; 320, second grid line unit; 330, grid line; 331, edge grid line; 332, center grid line; 400, cutting line. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0029] See Figure 1 An embodiment of this application provides a photovoltaic cell 100, which includes a cell body 200 and a plurality of grid line units 300 disposed on the cell body 200. The plurality of grid line units are arranged sequentially along a first direction, and each grid line unit 300 includes a plurality of grid lines 330 arranged sequentially and uniformly along the first direction. The distance c between two adjacent grid line units 300 is less than the spacing b between two adjacent grid lines 330 in the same grid line unit 300.

[0030] In this embodiment, a plurality of grid line units 300 are provided on the battery body 200. Each grid line unit includes a plurality of grid lines 330 arranged uniformly along a first direction. In actual use, the entire photovoltaic cell 100 can be cut into at least two sub-cells according to the distribution of the grid line units 300, so that each sub-cell's battery body 200 is provided with one grid line unit 300. Taking a photovoltaic cell 100 having the same first grid line unit 310 and second grid line unit 320 as an example, the photovoltaic cell 100 is used to cut into two equal-sized first cell 110 and second cell 120. The first grid line unit 310 is located on the battery body 200 of the first cell 110, and the second grid line unit 320 is located on the battery body 200 of the second cell 120.

[0031] Taking the left-right direction as an example, the first grid line unit 310 is located on the left side of the battery body 200, and the second grid line unit 320 is located on the right side of the battery body 200. It should be noted that since the width of the grid line is much smaller than the spacing between two adjacent grid lines, when the grid line width is ignored, the spacing b between two adjacent grid lines is the distance between the grid line on the left and the grid line on the right; while considering the grid line width, the spacing b between two adjacent grid lines is the distance between the center lines of the grid line on the left and the grid line on the right. Similarly, considering the grid line width, the distance between the center line of the rightmost grid line 330 of the first grid line unit 310 and the center line of the leftmost grid line 330 of the second grid line unit 320 is the distance c between the first grid line unit 310 and the second grid line unit 320, which is the distance c between two adjacent grid line units.

[0032] When cutting the photovoltaic cell 100, the cutting is performed from the middle of the first grid line unit 310 and the second grid line unit 320. The distance between the cut edge of the first cell 110 after being cut in half and the rightmost grid line of the first grid line unit 310 is referred to as the cutting spacing c / 2. At this time, the distance c between two adjacent grid line units 300 is less than the spacing b between two adjacent grid lines 330 in the same grid line unit 300. That is, the distance between the first grid line unit 310 and the second grid line unit 320 is reduced, so that the cutting spacing c / 2 is less than half of the grid line spacing b / 2. This enhances the current collection capability of the edge region of the cell, reduces the series resistance of current transmission, improves the fill factor of half cell, and thus achieves the purpose of efficiency improvement.

[0033] In some embodiments, the spacing c between two adjacent gate line units 300 is greater than or equal to 0.1 mm.

[0034] In this embodiment, the cutting is performed from the exact midpoint between two adjacent grid units 300. When the distance c between the two grid units 300 is greater than or equal to 0.1 mm, it avoids excessive mechanical stress on the grid units due to their proximity to the cutting edge during the cutting process when the cutting distance is too small. This reduces the risk of grid breakage and damage, and also reduces problems such as edge cracking and microcracks caused by concentrated surface load during cutting. This ensures the structural integrity and electrical performance stability of the halved battery cell, improving its reliability in subsequent module packaging and use. Specifically, a high-precision laser cutting device can be used for cutting, such as a short-wavelength laser. Short-wavelength lasers have more concentrated energy, higher absorption rate, and less heat diffusion during cutting, which can avoid affecting nearby grid lines. Example short-wavelength lasers are green light (532 nm) or ultraviolet light (355 nm); alternatively, low-frequency lasers can be used for multi-frequency cutting, or the laser spot size can be adjusted.

[0035] In some embodiments, a plurality of grid line units 300 are provided on the front side of the battery body 200, and the distance between two adjacent grid line units 300 on the front side is less than the spacing between two adjacent grid lines 330 in the same grid line unit 300 on the front side; and / or, a plurality of grid line units 300 are provided on the back side of the battery body 200, and the distance between two adjacent grid line units 300 on the back side is less than the spacing between two adjacent grid lines 330 in the same grid line unit 300 on the back side.

[0036] In some embodiments, the front side of the battery body 200 is provided with a plurality of grid line units 300, and the distance between two adjacent grid line units 300 on the front side is smaller than the spacing between two adjacent grid lines 330 in the same grid line unit 300 on the front side. The battery with multiple grid line units 300 on the front side of the battery body 200 can be an aluminum back field (Al-BSF) battery. During cutting, it is necessary to cut between two adjacent grid line units distributed on the front side.

[0037] In some other embodiments, a plurality of grid units 300 are provided on the back side of the battery body 200, and the distance between two adjacent grid units 300 on the back side is smaller than the spacing between two adjacent grid lines 330 in the same grid unit 300 on the back side. The battery in which the battery body 200 has a plurality of grid units 300 on the back side can be an IBC battery. During cutting, it is necessary to cut between two adjacent grid units distributed on the back side.

[0038] In other embodiments, the front side of the battery body 200 is provided with a plurality of grid line units 300, and the back side of the battery body 200 is provided with a plurality of grid line units 300. The grid line units 300 on the front side and the grid line units 300 on the back side are arranged in a one-to-one correspondence, that is, the spacing between two adjacent grid line units 300 on the front side corresponds to the spacing between two adjacent grid line units 300 on the back side, so that when cutting from either the front or back side of the battery body 200, the grid lines on the opposite side will not be cut. The battery with multiple grid line units 300 on both the front and back sides can be a TOPCon battery. The resistivity of the n-type silicon substrate of the TOPCon battery can be selected from 1Ωcm to 20Ωcm, the sheet resistance of the boron diffused emitter on the front side can be selected from 200 ohm / sq to 800 ohm / sq, and the sheet resistance of the n-type polycrystalline silicon on the back side can be selected from 10 ohm / sq to 100 ohm / sq.

[0039] Specifically, the front side of the battery body 200 is provided with a first grid line unit 310 and a second grid line unit 320. The back side of the battery body 200 is provided with a third grid line unit and a fourth grid line unit. The first grid line unit 310 is arranged opposite to the third grid line unit, and the second grid line unit 320 is arranged opposite to the fourth grid line unit.

[0040] For example, the distance between the first grid line unit 310 and the second grid line unit 320 is less than the grid line spacing, and the distance between the third grid line unit and the fourth grid line unit is equal to the grid line spacing. That is, only the grid line units on the front side are adjusted to enhance the current collection capability of the front edge region of the cell.

[0041] For example, the distance between the third and fourth grid line units is less than the grid line spacing, and the distance between the first grid line unit 310 and the second grid line unit 320 is equal to the grid line spacing. That is, only the grid line units on the back side are adjusted to enhance the current collection capability of the edge region on the back side of the cell.

[0042] For example, the distance between the first grid line unit 310 and the second grid line unit 320 is less than the grid line spacing, and the distance between the third grid line unit and the fourth grid line unit is less than the grid line spacing. That is, the grid line units on the front and back sides are adjusted at the same time to enhance the current collection capability of the edge regions of the front and back sides of the cell.

[0043] In some embodiments, a plurality of grid line units 300 are provided on the front side of the battery body 200, and the width of the grid lines 330 on the front side is 5μm-20μm; and / or, a plurality of grid line units 300 are provided on the back side of the battery body 200, and the width of the grid lines 330 on the back side is 20μm-30μm. The electrodes on the front and back sides are fabricated using stencil printing or screen printing.

[0044] In some embodiments, the front side of the battery body 200 is provided with a plurality of grid line units 300, and the width of the grid lines 330 on the front side is 5μm-20μm. The narrow grid line design of 5μm-20μm can significantly reduce the shading rate (compared to the traditional wide grid lines of more than 20μm, the shading area is reduced by 30%-50%), allowing more sunlight to enter the battery to excite photogenerated carriers, directly improving the short-circuit current (Isc) and light absorption efficiency.

[0045] In some other embodiments, a plurality of grid line units 300 are provided on the back side of the battery body 200, and the width of the grid lines 330 on the back side is 20μm-30μm. The core function of the grid lines 330 on the back side is to stably conduct the collected current to the external circuit. The 20μm-30μm width of the back grid lines is wider than that of the front grid lines (5μm-20μm), which can significantly reduce the resistance of the grid lines themselves (resistance is inversely proportional to line width) and reduce Joule losses when the current is transmitted in the grid lines.

[0046] In other embodiments, a plurality of grid line units 300 are provided on the front side of the battery body 200, and the width of the grid lines on the front side is 5μm-20μm; at the same time, a plurality of grid line units 300 are provided on the back side of the battery body 200, and the width of the grid lines on the back side is 20μm-30μm.

[0047] In some embodiments, a cutting line 400 is provided between two adjacent grid line units 300.

[0048] In some embodiments, a cutting groove is provided between two adjacent grid cells 300. The axis of the cutting groove is the cutting line 400. The cutting groove provides a clear physical guide for the laser cutting equipment, allowing the laser beam to be precisely focused along the axis of the cutting groove, reducing positioning deviations during cutting and improving cutting accuracy. At the same time, the cutting groove can pre-weaken the structural strength of the area, making laser cutting less labor-intensive, reducing impact and damage to other areas of the solar cell, further reducing mechanical and thermal stresses generated during cutting, and protecting the integrity of the grid cells.

[0049] In some other embodiments, the cutting line 400 is a drawing line. The drawing line can be formed by laser marking, inkjet printing, or other methods. It is simple to operate and low in cost, and can quickly make clear marks between adjacent grid line units, providing accurate positioning reference for laser cutting equipment.

[0050] In some embodiments, the number of gate lines 330 in each gate line unit 300 is the same.

[0051] Furthermore, when the multiple grid line units 300 are divided into the first grid line unit 310 and the second grid line unit 320, the cutting line 400 is located in the middle of the first grid line unit 310 and the second grid line unit 320, so that the cutting distance c / 2 of the first battery cell 110 and the second battery cell 120 after being cut in half is equal, that is, the cutting distance c / 2 of the first battery cell 110 and the cutting distance c / 2 of the second battery cell 120 are reduced at the same time, thereby enhancing the current collection capability of the edge region of the first battery cell 110 and the second battery cell 120.

[0052] Of course, in other embodiments, the distance between two adjacent gate line units 300 and the cutting line 400 may also be unequal.

[0053] In some embodiments, the number of gate lines 330 in each gate line unit 300 is equal.

[0054] The number of grid lines 330 in each grid unit 300 is equal. Combined with the precise setting of the cutting line 400, this ensures that the two sub-cells after being cut in half are completely equal. The equal number of grid lines ensures that the current collection area of ​​each grid unit 300 is evenly distributed. After being cut in half, the grid line 330 layout of the two sub-cells on both sides is completely symmetrical, avoiding local current collection capacity imbalance caused by differences in the number of grid lines and ensuring the consistency of the sub-cells in terms of physical structure.

[0055] Multiple grid line units 300 are divided into a first grid line unit 310 and a second grid line unit 320. Both the first and second grid line units 310 and 320 include multiple grid lines 330 arranged sequentially and uniformly along a first direction. The first grid line unit 310 is located to the left of the second grid line unit 320. Considering the grid line width, the distance from the center line of the leftmost grid line of the first grid line unit 310 to the edge of the left side wall of the battery body 200 is *a*. The distance from the center line of the rightmost grid line of the second grid line unit 320 to the edge of the right side wall of the battery body 200 is *a*. The spacing between the center lines of the rightmost grid line of the first grid line unit 310 and the center lines of the leftmost grid line of the second grid line unit 320 is *b*. The length of the battery body 200 along the first direction is *L*. The number of grid lines in the first grid line unit 310 is *e*. The distance *b* between two adjacent grid lines in the same adjacent grid line unit is (*L*-2*a*-*c*) / (*e*-2). Specifically, *b* is 0.5mm-2mm; *a* is 0.2mm-1mm.

[0056] Combination Figure 2An embodiment of this application also provides a half-cell photovoltaic cell 130. The half-cell photovoltaic cell 130 includes a half-cell body 133 and a plurality of grid lines 330 disposed on the half-cell body 133. The plurality of grid lines 330 are arranged uniformly in sequence along a first direction. The plurality of grid lines 330 includes edge grid lines 331 disposed at both ends of the half-cell body 133 along the first direction and a middle grid line 332 located between the two edge grid lines 331. The half-cell photovoltaic cell 130 has two sides 131 disposed opposite to each other along the first direction. The edge grid lines 331 are disposed one-to-one with the adjacent side 131.

[0057] In this case, the distance between at least one edge grid line 331 and the corresponding side 131 is less than half the spacing between two adjacent grid lines 330.

[0058] In this embodiment, the side 131 of the half-cell photovoltaic cell 130 (especially the cut edge formed by cutting) is a region with a high carrier recombination rate (due to the dense edge lattice defects). The distance between the edge grid line 331 and the corresponding side 131 is less than half the distance between two adjacent grid lines 330, which can shorten the lateral transmission distance of photogenerated carriers in the edge region, reduce the recombination loss of carriers during transmission, improve the current collection efficiency in the edge region, and avoid efficiency decay caused by the inability to collect edge carriers in time.

[0059] When considering the width of the gate line, the distance between the edge gate line 331 and the corresponding side 131 is the distance between the center line of the edge gate line 331 and the corresponding side 131, and the spacing between two adjacent gate lines 330 is the spacing between the center lines of two adjacent gate lines 330.

[0060] For example, the photovoltaic cell 100 is used to cut into two equal-sized half-cell photovoltaic cells. Each half-cell's main body 133 has two sides 131 arranged opposite each other along a first direction. One side 131 is the side 131 of the main body 200 itself, and the other side 131 is located on the cutting surface 132. The first direction is left-right, and the two sides 131 are arranged sequentially along this direction. Two edge grid lines 331 are the left edge grid line and the right edge grid line, respectively. The left edge grid line corresponds to the side 131 of the main body 200 itself, and the right edge grid line corresponds to the side on the cutting surface 132.

[0061] Specifically, the distance between the left edge grid line and the side 131 of the battery body 200 is less than half the spacing between two adjacent grid lines 330. And / or, the distance between the right edge grid line and the cut edge is less than half the spacing between two adjacent grid lines 330.

[0062] In some embodiments, the half-cell body 133 has a cut surface 132 perpendicular to a first direction, with one side 131 located on the cut surface 132, and a passivation layer is provided on the cut surface 132.

[0063] In this embodiment, the dicing process disrupts the lattice structure of the silicon wafer surface, resulting in numerous dangling bonds and defects on the diced surface 132, which become highly active centers for carrier recombination. Passivation layers (such as silicon oxide or silicon nitride) can significantly reduce the carrier recombination rate on the diced surface 132 through chemical passivation (saturating dangling bonds) and field passivation (forming a surface electric field), thereby reducing minority carrier lifetime decay caused by dicing and directly increasing the open-circuit voltage (Voc) and short-circuit current (Isc) of the half-cell.

[0064] Specifically, after the battery is cut in half, the cut sidewalls are passivated using one or more combinations of aluminum oxide, silicon nitride, and silicon oxynitride. The passivation film fixes the negative charge at a level of 1-5E20q / cm. 2 Surface passivation J0 < 1000 fA / cm 2 .

[0065] In some embodiments, the distance from each edge gate line 331 to the corresponding side 131 is greater than or equal to 0.05 mm. Specifically, taking into account the width of the edge gate line 331, the distance from the center line of each edge gate line 331 to the corresponding side 131 is greater than or equal to 0.05 mm.

[0066] In this embodiment, the distance from each edge grid line 331 to the corresponding side 131 is greater than or equal to 0.05 mm, which can enhance the current collection capability of the edge region of the cell, reduce the series resistance of current transmission, improve the fill factor of half cell, and thus achieve the purpose of efficiency improvement.

[0067] The following compares the original TOPCon cell (directly halved) half-cell photovoltaic cell with the improved TOPCon cell (directly halved) half-cell photovoltaic cell of this application. The original TOPCon cell has a grid spacing of 0.72 mm, while the halved spacing is 0.36 mm. In this application, the spacing between adjacent grid cells is greater than or equal to 0.2 mm, while the halved spacing is 0.1 mm. The comparison results are shown in the table below.

[0068]

[0069] As can be seen, the improved TOPCon cell, after being directly cut in half, has a fill factor that is increased by 0.04%abs and an efficiency that is increased by 0.01%abs.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A photovoltaic cell, characterized in that, The photovoltaic cell includes a cell body and a plurality of grid line units disposed on the cell body. The plurality of grid line units are arranged sequentially along a first direction, and each grid line unit includes a plurality of grid lines arranged uniformly along the first direction. The distance between two adjacent gate line units is less than the spacing between two adjacent gate lines in the same gate line unit.

2. The photovoltaic cell according to claim 1, characterized in that, The spacing between two adjacent grid cells is greater than or equal to 0.1 mm.

3. The photovoltaic cell according to claim 1, characterized in that, The front side of the battery body is provided with multiple grid line units, and the distance between two adjacent grid line units on the front side is smaller than the spacing between two adjacent grid lines in the same grid line unit on the front side. And / or, the back of the battery body is provided with a plurality of grid line units, and the distance between two adjacent grid line units on the back is less than the spacing between two adjacent grid lines in the same grid line unit on the back.

4. The photovoltaic cell according to claim 1, characterized in that, The front side of the battery body is provided with multiple grid line units, and the width of the grid lines on the front side is 5μm-20μm; And / or, the back of the battery body is provided with a plurality of grid line units, and the width of the grid lines on the back is 20μm-30μm.

5. The photovoltaic cell according to claim 1, characterized in that, A cutting line is provided between two adjacent grid line units.

6. The photovoltaic cell according to claim 5, characterized in that, The distance from each of the grid cells to the cut line is equal.

7. The photovoltaic cell according to claim 1, characterized in that, The number of gate lines in each gate line unit is equal.

8. A half-cell photovoltaic cell, characterized in that, The half-cell photovoltaic cell includes a half-cell body and a plurality of grid lines disposed on the half-cell body. The plurality of grid lines are arranged evenly in sequence along a first direction. The plurality of grid lines include edge grid lines disposed at both ends of the half-cell body along the first direction and a middle grid line located between the two edge grid lines. The half-cell body has two sides disposed opposite to each other along the first direction. Each edge grid line is disposed in one-to-one correspondence with the adjacent side. Wherein, the distance between at least one of the edge grid lines and the corresponding side edge is less than half the distance between two adjacent grid lines.

9. The half-cell photovoltaic cell according to claim 8, characterized in that, The half-cell photovoltaic cell has a cut surface perpendicular to the first direction, with one side located on the cut surface, and a passivation layer is provided on the cut surface.

10. The half-cell photovoltaic cell according to claim 8, characterized in that, The distance from each edge grid line to the corresponding side is greater than or equal to 0.05 mm.

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