Photovoltaic cell
By introducing the second gate line and reinforcement section design into the photovoltaic cell, welding instability and laser sintering problems in the zero main gate design are solved, the reliability and conductivity of the battery are improved, the production process is simplified and the cost is reduced.
Patent Information
- Application Number
- CN202421985203.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The zero-main gate design of existing photovoltaic cells has problems such as welding instability and difficulty in loading of laser sintering processes, which affects the reliability and efficiency of the battery.
A second gate line and a reinforcement section are introduced into the photovoltaic cell. The second gate line extends on both sides of each gate line group and is connected to adjacent gate line groups. The reinforcement section is arranged between adjacent gate line groups to ensure that current can be collected and transferred to the welding strip through the second gate line line, and can still be derived through other paths even when the reinforcement section is broken.
It improves the reliability and conductivity of photovoltaic cells, simplifies production processes, and reduces slurry consumables and production costs.
Smart Images
Figure CN223157539U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic cells, and in particular to a photovoltaic cell. Background Art
[0002] In the super dense grid design of photovoltaic cells, the main grid is mainly composed of a pad and a thin main grid, and is mainly responsible for welding. The secondary grid is mainly responsible for collecting current. When making a module, the solder ribbon is mainly welded to the pad and the thin main grid. When the module is working, the current collected by the secondary grid is directly transmitted to the nearest thin main grid or pad, then transmitted to the nearest solder ribbon, gathered along the solder ribbon to the bus bar, and finally led out through the lead wire. Now the zero main grid technology has become the main development trend of photovoltaic cells.
[0003] In the related art, the thin main grid plays a welding role. The thin main grid cannot be too thin, otherwise it will affect the conductive efficiency of the photovoltaic cell and its reliability. The gradient line of the zero main grid design changes from the secondary grid paste that conducts electricity mainly to the main grid paste for main welding. The pad is retained or cancelled. Such a design will, on the one hand, make the height of the gradient line follow the pad, and it is easy to have over-welding. On the other hand, it will make it difficult to load the laser sintering process and affect the efficiency improvement. Summary of the Utility Model
[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a photovoltaic cell with higher reliability.
[0005] The photovoltaic cell according to the embodiment of the utility model includes: grid lines, the grid lines include first grid lines and second grid lines. The first grid lines extend in a first direction and are multiple. The multiple first grid lines are arranged at intervals in a second direction. The multiple first grid lines form multiple groups of grid lines arranged at intervals in the first direction. Second grid lines are arranged on both sides in the first direction of each group of grid lines. The second grid lines extend in the second direction and are connected to the multiple first grid lines in each group of grid lines; a strengthening part, the strengthening part extends in the first direction and is arranged between two adjacent groups of grid lines. The two ends of the strengthening part in the first direction are respectively connected to two adjacent groups of grid lines. A plurality of the strengthening parts arranged at intervals in the second direction are arranged between two adjacent groups of grid lines.
[0006] Thus, by arranging the second grid lines on both sides in the first direction of each group of grid lines, and arranging the strengthening part between two adjacent groups of grid lines, even if the strengthening part is welded off, the current can be collected by the second grid lines and transmitted to the solder ribbon, thereby improving the reliability of the photovoltaic cell.
[0007] According to some embodiments of the present utility model, the distance between two adjacent second grid lines in two adjacent grid line groups in the first direction is L1, and L1 satisfies the relational expression: 0.8 mm ≤ L1 ≤ 1.2 mm.
[0008] According to some embodiments of the present utility model, the width of the second grid line in the first direction is L2, and L2 satisfies the relational expression: 0.01 mm ≤ L2 ≤ 0.015 mm.
[0009] According to some embodiments of the present utility model, the width of the reinforcing part in the second direction is L3, and the width of the first grid line in the second direction is L4. L3 and L4 satisfy the relational expression: L3 > L4.
[0010] According to some embodiments of the present utility model, L3 satisfies the relational expression: 0.02 mm ≤ L3 ≤ 0.03 mm.
[0011] According to some embodiments of the present utility model, L4 and L2 satisfy the relational expression: L4 = L2.
[0012] According to some embodiments of the present utility model, both ends of the reinforcing part in the first direction are electrically connected to the second grid lines on two adjacent grid line groups respectively; and / or both ends of the reinforcing part in the first direction are electrically connected to the corresponding first grid lines on two adjacent grid line groups respectively.
[0013] According to some embodiments of the present utility model, the photovoltaic cell further includes pads. A plurality of pads are arranged at intervals in the second direction between two adjacent grid line groups, and the pads are connected to the two adjacent grid line groups.
[0014] According to some embodiments of the present utility model, the width of the pad in the second direction is L5, and L5 satisfies the relational expression: 0.15 mm ≤ L5 ≤ 0.3 mm.
[0015] According to some embodiments of the present utility model, the welding tensile force of the pad is Q, and Q satisfies the relational expression: 0.5 N / mm < Q < 0.8 N / mm.
[0016] Some additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings
[0017] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:
[0018] Figure 1 is a schematic diagram of a photovoltaic cell according to an embodiment of the present utility model;
[0019] Figure 2 is Figure 1 a schematic diagram of area A in
[0020] Reference numerals:
[0021] 100, photovoltaic cell;
[0022] 10, grid line; 11, grid line group; 111, first grid line; 12, second grid line;
[0023] 20, strengthening part; 30, pad. Specific embodiments
[0024] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention will be described in detail below.
[0025] Refer to the following figure Figures 1-2 to describe the photovoltaic cell 100 according to an embodiment of the present invention.
[0026] Combined with Figures 1-2 as shown, the photovoltaic cell 100 according to an embodiment of the present invention may mainly include: a grid line 10 and a strengthening part 20. Among them, the grid line 10 includes a first grid line 111 and a second grid line 12. The first grid line 111 extends in a first direction and is multiple. The multiple first grid lines 111 are spaced apart in a second direction. The multiple first grid lines 111 form multiple grid line groups 11 spaced apart in the first direction. Second grid lines 12 are provided on both sides of each grid line group 11 in the first direction. The second grid lines 12 extend in the second direction and are connected to the multiple first grid lines 111 in each grid line group 11. The grid line 10 is adapted to collect the current generated by the light energy.
[0027] Specifically, in the embodiment of the present invention, both the grid line 10 and the strengthening part 20 are arranged on the front or back of the photovoltaic cell 100. Among them, the grid line 10 is mainly used to collect the current generated after the photovoltaic cell 100 receives light energy.
[0028] Furthermore, the grid line 10 includes a first grid line 111. The first grid line 111 extends in the first direction to increase the width of the first grid line 111 in the first direction. In this way, the setting range of the first grid line 111 in the first direction of the photovoltaic cell 100 can be increased, and the current collection ability of the grid line 10 along the first direction can be improved. The first grid line 111 is multiple, and the multiple first grid lines 111 all extend in the first direction to increase the number of the grid line 10 arranged on the photovoltaic cell 100, which is beneficial to improving the current collection ability of the photovoltaic cell 100.
[0029] Further, a plurality of first grid lines 111 are spaced apart in the second direction and form a plurality of grid line groups 11 spaced apart in the first direction. This can increase the setting range of the first grid lines 111 in the second direction of the photovoltaic cell 100 and enhance the ability of the grid lines 10 to collect current in the second direction.
[0030] Further, second grid lines 12 are provided on both sides of each grid line group 11 in the first direction. Thus, two second grid lines 12 are spaced apart in the first direction between two adjacent grid line groups 11, and the second grid lines 12 extend in the second direction. This can increase the width of the second grid lines 12 in the second direction and increase the ability of the grid lines 10 to collect current in the second direction.
[0031] Still further, the second grid lines 12 extend in the second direction, so that each of the plurality of first grid lines 111 spaced apart in the second direction in each grid line group 11 is connected to the second grid lines 12. Thus, the current collected by the plurality of first grid lines 111 spaced apart in the second direction can all flow to the second grid lines 12 on the adjacent side in the first direction, so that the second grid lines 12 can collect the current on the plurality of first grid lines 111 to collect the electric energy generated after the photovoltaic cell 100 receives light energy.
[0032] Further, the strengthening portion 20 extends in the first direction and is provided between two adjacent grid line groups 11. The two ends of the strengthening portion 20 in the first direction are respectively connected to two adjacent grid line groups 11. A plurality of strengthening portions 20 spaced apart in the second direction are provided between two adjacent grid line groups 11. The strengthening portion 20 is adapted to collect the current of the grid lines 10 and conduct it out.
[0033] Specifically, in the embodiment of the present invention, the strengthening portion 20 of the photovoltaic cell 100 is mainly used to collect the current of the grid lines 10 and is mainly used to be welded to the welding strip to conduct the collected current of the grid lines 10 through the welding strip. In the embodiment of the present invention, the current converges to the bus bar along the welding strip and is then conducted out through the lead wire.
[0034] The strengthening portion 20 is provided between two adjacent grid line groups 11 and extends in the first direction, so that the two ends of the strengthening portion 20 in the first direction are respectively connected to two adjacent first grid lines 111, so that the current on the first grid lines 111 on both sides of the strengthening portion 20 in the first direction can flow to the strengthening portion 20, so that the strengthening portion 20 can collect the current on the first grid lines 111.
[0035] Furthermore, there are multiple strengthening portions 20, and the multiple strengthening portions 20 are arranged at intervals in the second direction. In this way, the multiple strengthening portions 20 can be connected to all the first grid lines 111 arranged at intervals in the second direction in each grid line group 11, ensuring that each first grid line 111 in the grid line group 11 can be connected to the strengthening portion 20. With this arrangement, the current collected by each first grid line 111 can preferentially flow to the nearest strengthening portion 20, shortening the current flow path in the photovoltaic cell 100 and improving the conductivity efficiency of the photovoltaic cell 100.
[0036] Accordingly, there are two second grid lines 12 arranged at intervals in the first direction and multiple strengthening portions 20 arranged at intervals in the second direction between adjacent two grid line groups 11. After the solder tape is welded, it is located between the two second grid lines 12 arranged at intervals in the first direction, which can increase the current flow path between each grid line group 11 and the solder tape. Even if a single strengthening portion 20 fails to be welded, the current can still flow through the second grid line 12 to other strengthening portions 20 and then to the solder tape, thereby improving the conductivity reliability of the photovoltaic cell 100.
[0037] Combined with Figure 1 As shown, the distance between two adjacent second grid lines 12 in the first direction in adjacent two grid line groups 11 is L1, and L1 satisfies the relational expression: 0.8 mm ≤ L1 ≤ 1.2 mm.
[0038] According to some embodiments of the present invention, the distance between two adjacent second grid lines 12 in the first direction in adjacent two grid line groups 11 is set to be not less than a first parameter value. If the distance between two adjacent second grid lines 12 in the first direction in adjacent two grid line groups 11 is less than the first parameter value, the distance between two adjacent second grid lines 12 in the first direction is too close, which may cause the second grid line 12 to be disconnected from the first grid line 111 or cause the width of the strengthening portion 20 in the first direction to be too short, thereby affecting the welding reliability between the strengthening portion 20 and the solder tape. To ensure the connection reliability between the second grid line 12 and the first grid line 111 and the welding reliability between the strengthening portion 20 and the solder tape, it is necessary to set the distance between two adjacent second grid lines 12 in the first direction in adjacent two grid line groups 11 to be not less than the first parameter value. Among them, the first parameter value includes but is not limited to 0.75 mm, 0.8 mm, and 0.85 mm.
[0039] According to some other embodiments of the present utility model, the distance between two adjacent second grid lines 12 in two adjacent grid line groups 11 in the first direction is set not to exceed a second parameter value. If the distance between two adjacent second grid lines 12 in two adjacent grid line groups 11 in the first direction exceeds the second parameter value, the width of the reinforcing part 20 in the first direction needs to be increased, which will lead to an increase in the shielding area of the reinforcing part 20 on the photovoltaic cell 100, not only reducing the conductivity of the photovoltaic cell 100, but also increasing the paste consumption. To enhance the conductivity of the photovoltaic cell 100 and reduce the paste consumption, the distance between two adjacent second grid lines 12 in two adjacent grid line groups 11 in the first direction needs to be set not to exceed the second parameter value. Among them, the second parameter value includes but is not limited to 1.15 mm, 1.2 mm, and 1.25 mm.
[0040] Combined with Figure 1 As shown, the width of the second grid line 12 in the first direction is L2, and L2 satisfies the relational expression: 0.01 mm ≤ L2 ≤ 0.015 mm.
[0041] According to some embodiments of the present utility model, the width of the second grid line 12 in the first direction is set not to be less than a third parameter value. If the width of the second grid line 12 in the first direction is less than the third parameter value, the width of the second grid line 12 in the first direction is too small, which easily leads to the problem of broken welding of the second grid line 12. To prevent the broken welding of the second grid line 12, the width of the second grid line 12 in the first direction needs to be set not to be less than the third parameter value. Among them, the third parameter value includes but is not limited to 0.009 mm, 0.01 mm, and 0.011 mm.
[0042] According to some other embodiments of the present utility model, the width of the second grid line 12 in the first direction is set not to exceed a fourth parameter value. If the width of the second grid line 12 in the first direction exceeds the fourth parameter value, the width of the second grid line 12 in the first direction is too large, which will increase the paste consumption of the photovoltaic cell 100. To reduce the paste consumption of the photovoltaic cell 100, the width of the second grid line 12 in the first direction needs to be set not to exceed the fourth parameter value. Among them, the fourth parameter value includes but is not limited to 0.014 mm, 0.015 mm, and 0.016 mm.
[0043] Combined with Figure 2As shown, the width of the reinforcing portion 20 in the second direction is L3, and the width of the first grid line 111 in the second direction is L4, and L3 and L4 satisfy the relationship: L3>L4. Specifically, in the embodiment of the utility model, the width of the reinforcing portion 20 in the second direction is set to be greater than the width of the first grid line 111 in the second direction. Such a setting can increase the contact area between the reinforcing portion 20 and the welding strip, which is beneficial to improving the welding reliability of the reinforcing portion 20 and the welding strip, and further helps to improve the structural reliability of the photovoltaic cell 100, and can ensure the conductivity reliability of the photovoltaic cell 100.
[0044] Combination Figure 1 and Figure 2 As shown, L3 satisfies the relationship: 0.02mm≤L3≤0.03mm.
[0045] According to some embodiments of the utility model, the width of the reinforcing portion 20 in the second direction is set to be not less than the fifth parameter value. If the width of the reinforcing portion 20 in the second direction is set to be less than the fifth parameter value, the width of the reinforcing portion 20 in the second direction is too small, which will reduce the contact area between the reinforcing portion 20 and the welding strip, affect the welding reliability of the welding strip and the reinforcing portion 20, and make it difficult to extract the current of the grid line 10 collected by the reinforcing portion 20. In order to ensure the reliability of current extraction of the photovoltaic cell 100, it is necessary to set the width of the reinforcing portion 20 in the second direction to be not less than the fifth parameter value, wherein the fifth parameter value includes but is not limited to 0.015mm, 0.02mm and 0.025mm.
[0046] According to other embodiments of the utility model, the width of the reinforcing portion 20 in the second direction is set not to exceed the sixth parameter value. If the width of the reinforcing portion 20 in the second direction exceeds the sixth parameter value, the width of the reinforcing portion 20 in the second direction is too large, which will not only lead to an increase in slurry consumables, but also easily cause over-welding of the reinforcing portion 20, resulting in component power attenuation, affecting component performance and life. In order to reduce the slurry consumables of the photovoltaic cell 100 and prevent the photovoltaic cell 100 from over-welding, it is necessary to set the width of the reinforcing portion 20 in the second direction not to exceed the sixth parameter value. Among them, the sixth parameter value includes but is not limited to 0.025mm, 0.03mm and 0.035mm.
[0047] Combination Figure 2 As shown, L4 and L2 satisfy the relationship: L4 = L2. Specifically, the width of the first grid line 111 in the second direction is set equal to the width of the second grid line 12 in the first direction, so that the second grid line 12 and the first grid line 111 can use the same slurry laying process, which can simplify the production of the photovoltaic cell 100, help reduce the production cost of the photovoltaic cell 100, and also help improve the production efficiency of the photovoltaic cell 100.
[0048] In an embodiment of the present utility model, both the first grid line 111 and the second grid line 12 adopt a sub-grid paste for main conduction, and the second grid line 12 extends in the second direction. In this way, the laser sintering process can be directly loaded through the second grid line 12 without upgrading the tooling, which is beneficial to improving the production convenience of the photovoltaic cell 100.
[0049] According to some embodiments of the present utility model, both ends of the reinforcing part 20 in the first direction are electrically connected to the second grid lines 12 on two adjacent grid line groups 11 respectively. Specifically, the reinforcing part 20 can collect and conduct the current on the grid line 10. By overlapping both ends of the reinforcing part 20 in the first direction with the second grid lines 12 between two adjacent grid line groups 11 respectively, both the reinforcing part 20 and the second grid line 12 can be welded to the solder strip. This can not only increase the welding positions of the photovoltaic cell 100 with the solder strip, which is beneficial to the welding of the solder strip, but also enable the current on the second grid line 12 and the reinforcing part 20 to flow to the solder strip, which is beneficial to current conduction.
[0050] In addition, since the second grid line 12 is connected to multiple first grid lines 111 simultaneously in the second direction, the current in the grid line group 11 can be uniformly guided to multiple reinforcing parts 20 through the second grid line 12. In this way, when the number of broken-weld reinforcing parts 20 is within a certain range, the reliability of current collection and conduction of the grid line group 11 can be ensured, and thus the working reliability of the photovoltaic cell 100 can be improved.
[0051] According to other embodiments of the present utility model, both ends of the reinforcing part 20 in the first direction are electrically connected to the corresponding first grid lines 111 on two adjacent grid line groups 11 respectively. With this arrangement, the current on the first grid lines 111 in two adjacent grid line groups 11 can directly flow to the corresponding reinforcing parts 20, so as to reduce the resistance and improve the conduction efficiency of the photovoltaic cell 100.
[0052] According to still other embodiments of the present utility model, both ends of the reinforcing part 20 in the first direction are electrically connected to the second grid lines 12 on two adjacent grid line groups 11 respectively, and both ends of the reinforcing part 20 in the first direction are electrically connected to the corresponding first grid lines 111 on two adjacent grid line groups 11 respectively. With this arrangement, on the one hand, the current on the first grid lines 111 in two adjacent grid line groups 11 can directly flow to the corresponding reinforcing parts 20, so as to reduce the resistance and improve the conduction efficiency of the photovoltaic cell 100. On the other hand, when the number of broken-weld reinforcing parts 20 is within a certain range, the current on the first grid lines 111 corresponding to the broken-weld reinforcing parts 20 can flow to other reinforcing parts 20 through the second grid line 12, and then can be conducted out through the solder strip. In this way, the reliability of current collection and conduction of the grid line group 11 can be ensured, and the working reliability of the photovoltaic cell 100 can be improved.
[0053] Combined with Figure 1 andFigure 2 As shown, the photovoltaic cell 100 further includes pads 30. A plurality of pads 30 are arranged at intervals in the second direction between two adjacent grid line groups 11, and the pads 30 are connected to the two adjacent grid line groups 11. Specifically, the pads 30 are arranged between two adjacent grid line groups 11 and are correspondingly arranged with a plurality of strengthening parts 20 in the second direction. The pads 30 are mainly used for welding with welding tapes to increase the structural reliability of the welding tapes on the photovoltaic cell 100. In the embodiment of the present invention, the pads 30 and the strengthening parts 20 have the same function. The number of the pads 30 is multiple, and a plurality of strengthening parts 20 can be arranged at intervals between two adjacent pads 30 along the second direction.
[0054] According to the embodiment of the present invention, the strengthening parts 20 adopt main grid pastes mainly used for welding, which can ensure a good welding tensile force between the welding tapes and the strengthening parts 20, can solve the problem of poor conductivity caused by easy welding breakage when the pads 30 and the strengthening parts 20 are welded, and can ensure the reliability of the strengthening parts 20 after lamination or long-term outdoor use in the photovoltaic cell 100. With such a setting, the paste setting of the strengthening parts 20 can improve the welding reliability of the welding tapes, and further can provide a space for reducing the size of the pads 30.
[0055] Combined with Figure 2 As shown, the width of the pad 30 in the second direction is L5, and L5 satisfies the relational expression: 0.15 mm ≤ L5 ≤ 0.3 mm.
[0056] According to some embodiments of the present invention, the width of the pad 30 in the second direction is set to be not less than the seventh parameter value. If the width of the pad 30 in the second direction is set to be less than the seventh parameter value, the welding tensile force of the pad 30 will be reduced, and further the welding effect of the welding tape and the pad 30 will be affected. To ensure that the welding tensile force of the pad 30 meets the structural reliability of the welding tape on the photovoltaic cell 100, it is necessary to set the width of the pad 30 in the second direction to be not less than the seventh parameter value, where the seventh parameter value includes but is not limited to 0.10 mm, 0.15 mm, and 0.2 mm.
[0057] According to other embodiments of the present invention, the width of the pad 30 in the second direction is set to be not more than the eighth parameter value. If the width of the pad 30 in the second direction is set to be more than the eighth parameter value, the width of the pad 30 in the second direction is too large, which will not only increase the paste consumption, but also cause a relatively high wet weight of the paste of the photovoltaic cell 100, affecting the conduction efficiency. To reduce the cost of the photovoltaic cell 100 and improve the conduction efficiency, it is necessary to set the width of the pad 30 in the second direction to be not more than the eighth parameter value, where the eighth parameter value includes but is not limited to 0.25 mm, 0.3 mm, and 0.35 mm.
[0058] Combined with Figure 1 and Figure 2As shown, the soldering tensile force of the pad 30 is Q, and Q satisfies the relationship: 0.5 N / mm < Q < 0.8 N / mm. According to some embodiments of the present invention, the soldering tensile force of the pad 30 is not less than the ninth parameter value. If the soldering tensile force of the pad 30 is lower than the ninth parameter value, the soldering tensile force of the pad 30 is too small, and there is a risk of the pad 30 breaking solder. To ensure that the soldering tensile force of the pad 30 meets the soldering requirements of the solder tape, it is necessary to set the soldering tensile force of the pad 30 to be not less than the ninth parameter value, where the ninth parameter value includes but is not limited to 0.5 N / mm, 0.55 N / mm, and 0.6 N / mm.
[0059] According to some other embodiments of the present invention, the soldering tensile force of the pad 30 does not exceed the tenth parameter value. If the soldering tensile force of the pad 30 exceeds the tenth parameter value, the soldering tensile force of the pad 30 is too large, the solder joint bearing capacity decreases and the dispersion becomes larger, especially having a great impact on the tensile load of the pad 30, and further affecting the soldering quality of the solder tape and the pad 30. To ensure the soldering reliability of the solder tape and the pad 30, it is necessary to set the soldering tensile force of the pad 30 not to exceed the tenth parameter value, where the tenth parameter value includes but is not limited to 0.7 N / mm, 0.75 N / mm, and 0.8 N / mm.
[0060] According to the embodiments of the present invention, the designs of the reinforcing part 20, the grid line 10, the pad 30, etc. in the present application can be directly matched with the existing soldering machines at the component end, without the need to modify the equipment, and can be directly and quickly imported. Through the embodiments of the present invention, the paste cost reduction of the photovoltaic cell 100 can be achieved between 5 and 10 mg, and the product competitiveness of PERC (Passivated Emitter and Rear Cell) or TOPCON (Tunnel Oxide Passivated Contact) can be improved.
[0061] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.
[0062] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.
Claims
1. A photovoltaic cell, characterized in that, Including: Grid lines (10), the grid lines (10) include first grid lines (111) and second grid lines (12). The first grid lines (111) extend in a first direction and are multiple. The multiple first grid lines (111) are spaced apart in a second direction. The multiple first grid lines (111) form multiple groups of grid lines (11) spaced apart in the first direction. Second grid lines (12) are provided on both sides of each group of grid lines (11) in the first direction. The second grid lines (12) extend in the second direction and are connected to the multiple first grid lines (111) in each group of grid lines (11). Reinforcing parts (20), the reinforcing parts (20) extend in the first direction and are provided between adjacent groups of grid lines (11). The two ends of the reinforcing parts (20) in the first direction are respectively connected to adjacent groups of grid lines (11). Multiple reinforcing parts (20) spaced apart in the second direction are provided between adjacent groups of grid lines (11).
2. The photovoltaic cell according to claim 1, characterized in that, The distance in the first direction between two adjacent second grid lines (12) in two adjacent groups of grid lines (11) is L1, and L1 satisfies the relationship: 0.8 mm ≤ L1 ≤ 1.2 mm.
3. The photovoltaic cell according to claim 2, characterized in that, The width of the second grid line (12) in the first direction is L2, and L2 satisfies the relationship: 0.01 mm ≤ L2 ≤ 0.015 mm.
4. The photovoltaic cell according to claim 3, wherein The width of the reinforcing part (20) in the second direction is L3, and the width of the first grid line (111) in the second direction is L4. L3 and L4 satisfy the relationship: L3 > L4.
5. The photovoltaic cell according to claim 4, characterized in that, L3 satisfies the relationship: 0.02 mm ≤ L3 ≤ 0.03 mm.
6. The photovoltaic cell according to claim 5, characterized in that, L4 and L2 satisfy the relationship: L4 = L2.
7. The photovoltaic cell according to claim 1, characterized in that, The two ends of the reinforcing part (20) in the first direction are respectively electrically connected to the second grid lines (12) on adjacent groups of grid lines (11); and / or The two ends of the reinforcing part (20) in the first direction are respectively electrically connected to the corresponding first grid lines (111) on adjacent groups of grid lines (11).
8. The photovoltaic cell according to claim 1, characterized in that, It further includes pads (30). Multiple pads (30) spaced apart in the second direction are provided between adjacent groups of grid lines (11). The pads (30) are connected to adjacent groups of grid lines (11).
9. The photovoltaic cell according to claim 8, characterized in that, The width of the pad (30) in the second direction is L5, and L5 satisfies the relationship: 0.15 mm ≤ L5 ≤ 0.3 mm.
10. The photovoltaic cell according to claim 8, characterized in that, The welding tensile force of the pad (30) is Q, and Q satisfies the relationship: 0.5 N / mm < Q < 0.8 N / mm.