A solar cell and a photovoltaic module

Abstract

The utility model relates to the technical field of solar photovoltaic, especially relates to a solar cell and photovoltaic module. In the solar cell, at least one side of the cell piece body is equipped with first area and second area, first area sets up around the edge of cell piece body, second area is located in the middle part of cell piece body, and first area is located between second area and adjacent edge, a plurality of current collection electrodes are arranged on at least one side of the cell piece body, the plurality of current collection electrodes are arranged at intervals along the first direction, each current collection electrode extends along the second direction, and the first direction intersects with the second direction, the width of the current collection electrode located in the first area is greater than the width of the current collection electrode located in the second area. That is, for the probability of broken grid of different areas on the surface of the solar cell, the current collection electrode is widened in the high fracture area, and the line width is narrowed in the low fracture risk area, so that the light shielding loss is minimized while the strength and conductivity reliability of the current collection electrode are ensured, and the yield and efficiency of the solar cell are improved.

Description

Technical Field

[0001] This utility model relates to the field of solar photovoltaic technology, and in particular to a solar cell and a photovoltaic module. Background Technology

[0002] Several current collector electrodes are arranged on the surface of a silicon wafer in a solar cell. These electrodes collect and transmit the photocurrent generated by the light. The current collector electrodes are metal lines located on the surface of the cell, typically made of silver, aluminum, or other conductive materials. In current technology, the current collector electrodes are prone to breakage, affecting the yield of the solar cell. Utility Model Content

[0003] In view of this, the present invention proposes a solar cell and a photovoltaic module, aiming to partially or completely solve the technical problem that the current collecting electrodes on existing solar cells are prone to breakage.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] In a first aspect, embodiments of the present invention provide a solar cell, comprising,

[0006] A battery cell body, wherein at least one side of the battery cell body is provided with a first region and a second region, the first region is disposed around the edge of the battery cell body, the second region is disposed in the middle of the battery cell body, and the first region is located between an adjacent edge and the second region;

[0007] Multiple current collectors are disposed on at least one side of the battery cell body, the multiple current collectors are arranged at intervals along a first direction, and each current collector extends along a second direction, the first direction intersecting the second direction;

[0008] The width of the current collector electrode located in the first region is greater than the width of the current collector electrode located in the second region.

[0009] In some possible implementations, in the second direction, the width of the battery cell body is L1, and the width of the first region on one side of the second region is L2, satisfying that 6%L1≤L2≤9%L1.

[0010] In some possible implementations, in the first direction, the length of the battery cell body is L3, and the width of the first region on one side of the second region is L4, satisfying that 2.5%L3≤L4≤5%L3.

[0011] In some possible implementations, in the second direction, the width of the first region on one side of the second region is L2; ​​in the first direction, the width of the first region on one side of the second region is L4, satisfying 0.2L2≤L4≤L2.

[0012] In some possible implementations, the solar cell further includes a plurality of busbars disposed on at least one side of the cell body, the busbars being connected to the current collector electrode; the cell body has two second sides parallel to the second direction, the d-th group of busbars near the adjacent second side, the region between the adjacent second side and the first region, where d is one of 1, 2, or 3.

[0013] In some possible implementations, the first region includes a first sub-region and a second sub-region, the first sub-region being located at the top corner of the battery cell body, and the remaining portion of the first region excluding the first sub-region being the second sub-region; the width of the current collector electrode located within the first sub-region is greater than the width of the current collector electrode located within the second sub-region.

[0014] In some possible implementations, the width of the current collector electrode located in the first sub-region is W3, the width of the current collector electrode located in the second sub-region is W4, and the width of the current collector electrode located in the second region is W2, where 1.45W2≥W3≥1.35W2; and / or, 1.1W2≥W4≥1.05W2.

[0015] In some possible implementations, the width of the battery cell body in the second direction is L1, and the width of each first sub-region in the second direction is L5, satisfying 0.3%L1≤L5≤2%L1; and / or, the length of the battery cell body in the first direction is L3, and the length of each first sub-region in the first direction is L6, satisfying 1.2%L3≤L6≤2.5%L3.

[0016] In some possible implementations, the width of the current collector electrode located in the first region is W1, and the width of the current collector electrode located in the second region is W2, satisfying 1.4W2≥W1≥1.05W2; and / or, the height of the current collector electrode located in the first region is H1, and the height of the current collector electrode located in the second region is H2, satisfying 1.1H2≥H1≥1.05H2.

[0017] In some possible implementations, the maximum width of the current collector electrode located in the first region is W1, satisfying 45μm≥W1≥30μm; and / or, the maximum width of the current collector electrode located in the second region is W2, satisfying 30μm≥W2≥20μm.

[0018] In some possible implementations, the widest portion of the current collector electrode in the first region is a first portion, and the widest portion in the second region is a second portion, with a stepped structure formed between the first portion and the second portion in the width direction; or, a slope is formed between the first portion and the second portion in the width direction; or, the first portion and the second portion have a smooth transition in the width direction.

[0019] Secondly, this utility model provides a photovoltaic module, which includes the solar cell as described above.

[0020] In the solar cell disclosed in this application embodiment, the first region is located at the edge of at least one side of the cell body, and the second region is located in the middle of at least one side of the cell body. The breakage probability of the current collector electrode in the first region is higher than that of the current collector electrode in the second region. Therefore, the width of the current collector electrode located in the first region is set to be greater than the width of the current collector electrode located in the second region. That is, according to the breakage probability of different regions on the surface of the solar cell, the current collector electrode is widened in the high-breakage region and narrowed in the low-breakage region. While ensuring the strength and conductivity reliability of the current collector electrode, the shading loss is minimized, thereby improving the yield and efficiency of the solar cell.

[0021] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the structure of the solar cell described in an embodiment of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the solar cell described in an embodiment of the present invention. Figure 2 ;

[0025] Figure 3This is a schematic diagram of the structure of the solar cell described in an embodiment of the present invention. Figure 3 ;

[0026] Figure 4 This is a schematic diagram of the structure of the solar cell described in an embodiment of the present invention. Figure 4 ;

[0027] Figure 5 This is a partial structural diagram of the current collector electrode described in an embodiment of the present invention. Figure 1 ;

[0028] Figure 6 This is a partial structural diagram of the current collector electrode described in an embodiment of the present invention. Figure 2 ;

[0029] Figure 7 This is a partial structural diagram of the current collector electrode described in an embodiment of the present invention. Figure 3 .

[0030] Explanation of reference numerals in the attached figures:

[0031] 10. Battery cell body; 11. First side; 12. Second side; 13. First region; 131. First sub-region; 132. Second sub-region; 14. Second region;

[0032] 20. Collector electrode; 21. First part; 22. Second part;

[0033] 30. Bus electrode; 40. Electrical connection; 50. Connector; 60. Busbar;

[0034] X, the first direction; Y, the second direction. Detailed Implementation

[0035] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0036] Several current collector electrodes are arranged on the surface of the silicon wafer of a solar cell. These electrodes collect and transmit the photocurrent. In current technology, the current collector electrodes adopt a uniform linewidth design, which makes them prone to breakage and affects the yield of the solar cell.

[0037] Reference Figures 1 to 7As shown, this application provides a solar cell in which the linewidth of the corresponding current collector electrode is set according to spatial differences. Compared with the solution of widening all current collector electrodes in the solar cell to avoid breakage of the current collector electrode, the shading loss can be reduced.

[0038] The solar cells and photovoltaic modules provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios. The solar cells have intersecting first direction X and second direction Y. The included angle between the first direction X and the second direction Y is specifically set according to the usage requirements; for example, the first direction X and the second direction Y are perpendicular to each other.

[0039] Reference Figure 1 As shown, the solar cell includes a cell body 10 and a plurality of current collector electrodes 20. At least one side of the cell body 10 is provided with a first region 13 and a second region 14. The first region 13 is disposed around the edge of the cell body 10, and the second region 14 is disposed in the middle of the cell body 10. The first region 13 is located between adjacent edges and the second region 14. The plurality of current collector electrodes 20 are disposed on at least one side of the cell body 10. The plurality of current collector electrodes 20 are arranged at intervals along a first direction X, and each current collector electrode 20 extends along a second direction Y. The first direction X and the second direction Y intersect. The width of the current collector electrode 20 located in the first region 13 is greater than the width of the current collector electrode 20 located in the second region 14.

[0040] In this application example, the solar cell body 10 includes a light-receiving surface and a back-lighting surface disposed opposite each other in its thickness direction. A current collector electrode 20 is disposed on at least one of the light-receiving surface and the back-lighting surface. Different types of solar cells are generated when the current collector electrode 20 is disposed on different surfaces. For example, when the current collector electrode 20 is disposed on both the light-receiving and back-lighting surfaces, the solar cell is a bifacial cell. As another example, when the current collector electrode 20 is disposed only on the back-lighting surface, the solar cell is a back-contact cell. For a back-contact cell, the current collector electrode 20 corresponds to two different types of doped regions, i.e., there are two polarities of current collector electrode 20. At least one polarity of current collector electrode 20 is sufficient to satisfy the electrode arrangement characteristics of this application.

[0041] In the solar cell of this application example, the first region 13 is located at the edge of at least one side of the cell body 10, and the second region 14 is located in the middle of at least one side of the cell body 10. The breakage probability of the current collector electrode 20 on the first region 13 is higher than that of the current collector electrode 20 on the second region 14. Thus, the width of the current collector electrode 20 located in the first region 13 is set to be greater than the width of the current collector electrode 20 located in the second region 14. That is, according to the grid breakage probability of different regions on the surface of the solar cell, the current collector electrode 20 is widened in the high-risk breakage region and narrowed in the low-risk breakage region. While ensuring the strength and conductivity reliability of the current collector electrode 20, the shading loss is minimized, thereby improving the yield and efficiency of the solar cell.

[0042] It is understandable that the dividing line between the first region 13 and the second region 14 is not an actual dividing line formed on the surface of the battery cell body 10, but only a virtual line used to distinguish different regions on the surface of the battery cell body 10; moreover, the dividing line between the first region 13 and the second region 14 can be a line parallel to the first direction X and the second direction Y respectively, or it can be a line with a bend, curve or other shape.

[0043] Reference Figure 1 As shown, the first region 13 forms a ring structure at the edge of the surface of the battery cell body 10. The width of the first region 13 between the second region 14 and the adjacent side is set according to the usage requirements. For example, it is necessary to take into account the actual situation of the line shape under the design parameters such as actual screen yarn thickness, film thickness, and line width.

[0044] In some possible implementations, in the second direction Y, the width of the battery cell body 10 is L1, and the width of the first region 13 on one side of the second region 14 is L2, satisfying 6%L1≤L2≤9%L1; specifically, L2 is at least one of 6%L1, 6.5%L1, 7%L1, 7.5%L1, 8%L1, 8.5%L1, and 9%L1.

[0045] In some possible implementations, in the first direction X, the length of the battery cell body 10 is L3, and the width of the first region 13 on one side of the second region 14 is L4, satisfying 2.5%L3≤L4≤5%L3; specifically, L4 is at least one of 2.5%L3, 3%L3, 3.5%L3, 4%L3, and 5%L3.

[0046] The relationship between the width L2 of the first region 13 on the Y side of the second region 14 and the width L4 of the first region 13 on the X side of the first region 14 can also be set according to actual usage requirements. In some possible implementations, 0.2L2≤L4≤L2; specifically, L4 is at least one of 0.2L2, 0.3L2, 0.4L2, 0.5L2, 0.6L2, 0.7L2, 0.8L2, 0.9L2, and L2.

[0047] In this embodiment, when the width L2 of the first region 13 on the Y side of the second region 14 and the width L4 of the first region 13 on the X side of the first direction are within the above range, the setting of L2 and L4 is more reasonable, and the range of the first region 13 is more reasonable. Setting the width of the collector electrode 20 located in the first region 13 to be greater than the width of the collector electrode 20 located in the second region 14 can minimize the light-shielding loss while ensuring the conductivity reliability of the collector electrode 20.

[0048] The arrangement of the first region 13 can also influence the design of the solar cell layout. In some possible implementations, in solar cells without the bus electrode 30, refer to... Figures 1 to 3 As shown, the battery cell body 10 has two second sides 12 parallel to the second direction Y. A number of current collectors 20 are disposed on one surface of the battery cell body 10. A number of current collectors 20 close to the adjacent second side 12 are located in the first region 13, satisfying 9%a≥b≥6%a, where a and b are natural numbers.

[0049] In some other possible embodiments, in a solar cell provided with a bus electrode 30, refer to Figure 4 As shown, multiple bus electrodes 30 are arranged at intervals along the second direction Y, each bus electrode 30 extends along the first direction X, and each bus electrode 30 is connected to multiple current collector electrodes 20; the battery cell body 10 has two first sides 11 parallel to the first direction X, the c-th bus electrode 30 close to the adjacent first side 11, and the area to the adjacent first side 11 is the first region 13, where c is one of 1, 2, or 3.

[0050] In some possible implementations, the solar cell also includes a plurality of busbars 60 disposed on at least one side of the cell body 10, and the busbars 60 are connected to the current collector electrode 20; the area between the d-th group of busbars 60 near the adjacent second side 12 and the adjacent second side 12 is a first region 13, where d is one of 1, 2, or 3.

[0051] It is understood that the busbar 60 includes at least one of the following: a busbar electrode 30, an electrical connection portion 40, and a connector 50. The electrical connection portion 40 is used to connect to the conductive layer of the solder strip or conductive backsheet to achieve current conduction. The connector 50 can connect several current collector electrodes 20, and typically connects to at least one electrical connection portion 40, and can be located in the middle or at the edge of the solar cell. The position of the busbar 60 can also be used to partition the area according to the probability of grid breakage in different regions, and obtain a relatively clear partition location.

[0052] In some possible implementations, in a solar cell provided with a bus electrode 30, or in a solar cell provided with a connector 50, the width of the bus electrode 30 or connector 50 located in the first region 13 is at least partially greater than the width of the bus electrode 30 or connector 50 located in the second region 14.

[0053] In some possible implementations, the first region 13 includes a first sub-region 131 and a second sub-region 132. The first sub-region 131 is located at the top corner of the battery cell body 10, and the remaining part of the first region 13 excluding the first sub-region 131 is the second sub-region 132. The width of the current collector 20 located in the first sub-region 131 is greater than the width of the current collector 20 located in the second sub-region 132.

[0054] The inventors discovered that the collector electrode 20 at the top corner of the cell body 10 has the highest probability of breakage. In this embodiment, the first region 13 is further divided into a first sub-region 131 and a second sub-region 132. The first sub-region 131 is located at the top corner of the cell body 10. The width of the collector electrode 20 in the first sub-region 131 is greater than the width of the collector electrode 20 in the second sub-region 132. In order to target the grid breakage probability of different regions on the surface of the solar cell, the first region 13, where breakage is more frequent, is further divided. The collector electrode 20 in the first sub-region 131, where breakage is most frequent, is widened. In this way, while avoiding the breakage of the collector electrode 20 in the first sub-region 131 and ensuring the conductivity reliability of the collector electrode 20 in the first sub-region 131, compared with widening the collector electrode 20 in the entire first region 13, the refractive loss can also be reduced and the efficiency of the solar cell can be improved.

[0055] In some possible implementations, the relationship between the width W3 of the collector electrode 20 in the first sub-region 131, the width W4 of the collector electrode 20 in the second sub-region 132, and the width W2 of the collector electrode 20 in the second region 14 can be set according to usage requirements. For example, 1.45W2 ≥ W3 ≥ 1.35W2; specifically, W3 is at least one of 1.35W2, 1.36W2, 1.37W2, 1.38W2, 1.39W2, 1.4W2, 1.41W2, 1.42W2, 1.43W2, 1.44W2, and 1.15W2. Another example is 1.1W2 ≥ W4 ≥ 1.05W2; specifically, W4 is at least one of 1.05W2, 1.06W2, 1.07W2, 1.08W2, 1.09W2, and 1.1W2.

[0056] In some possible implementations, the width L1 of the battery cell body 10 in the second direction Y, and the width L5 of each first sub-region 131 in the second direction Y, the relationship between L1 and L5 is also set according to actual usage requirements, for example, 0.3%L1≤L5≤2%L1; specifically, L5 is at least one of 0.3%L1, 0.5%L1, 0.7%L1, 0.9%L1, 1%L1, 1.2%L1, 1.4%L1, 1.6%L1, 1.8%L1, and 2%L1.

[0057] In some possible implementations, the length L3 of the battery cell body 10 in the first direction X, and the length L6 of each first sub-region 131 in the first direction X, the relationship between L3 and L6 is also set according to actual usage requirements, for example, 1.2%L3≤L6≤2.5%L3; specifically, L6 is at least one of 1.2%L3, 1.3%L3, 1.4%L3, 1.5%L3, 1.6%L3, 1.7%L3, 1.8%L3, 1.9%L3, 2%L3, 2.1%L3, 2.2%L3, 2.3%L3, 2.4%L3, and 2.5%L3.

[0058] In the above embodiments, the division of the first sub-region 131 and the second sub-region 132 is based on size, and can also be based on the position of the structure on the solar cell. For example, in some other embodiments, the solar cell also includes a plurality of electrical junctions 40, of which one electrical junction 40 is the e-th electrical junction 40 near the adjacent first side 11 and the f-th electrical junction 40 near the adjacent second side 12. The area enclosed by this electrical junction 40, the first side 11, the second side 12, and the adjacent vertex is the first sub-region 131; where e and f are natural numbers, that is, one vertex of the first sub-region 131 corresponds to one electrical junction 40.

[0059] The specific dimensional relationship of the current collector 20 within the first region 13 and the second region 14 is set according to the usage requirements. In some possible embodiments, the width W1 of the current collector 20 located in the first region 13 has a corresponding dimensional relationship with the width W2 of the current collector 20 located in the second region 14, for example, 1.4W2 ≥ W1 ≥ 1.05W2; specifically, W1 is at least one of 1.05W2, 1.1W2, 1.15W2, 1.2W2, 1.25W2, 1.3W2, 1.35W2, and 1.4W2.

[0060] In some possible implementations, the height H1 of the current collector 20 located in the first region 13 and the height H2 of the current collector 20 located in the second region 14 have a corresponding dimensional relationship, for example, 1.1H2≥H1≥1.05H2; specifically, H1 is at least one of 1.05H2, 1.06H2, 1.07H2, 1.08H2, 1.09H2, and 1.1H2.

[0061] In some possible implementations, the maximum width of the current collector 20 located in the first region 13 is W1, which satisfies 45μm≥W1≥30μm; specifically, W1 is at least one of 30μm, 31μm, 32μm, 33μm, 34μm, 35μm, 36μm, 37μm, 38μm, 39μm, 40μm, 41μm, 42μm, 43μm, 44μm, and 45μm.

[0062] In some possible implementations, the maximum width of the current collector 20 located in the second region 14 is W2, which satisfies 30μm≥W2≥20μm; specifically, W2 is at least one of 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, and 30μm.

[0063] The width range of the current collector 20, current bus 30 or connector 50 in the first region 13 and the width difference between the two in the second region 14 can be selected according to the actual situation, such as the different situations for screen printing or plate printing.

[0064] In this embodiment, the entire current collector 20 is located within the first region 13. Alternatively, a current collector 20 may be partially located within the first region 13, with the remaining portion located within the second region 14. The widest portion of the current collector 20 in the first region 13 is the first part 21, and the widest portion in the second region 14 is the second part 22. The first part 21 and the second part 22 are connected, and there is a width difference between them. The connection method between the first part 21 and the second part 22 is set according to usage requirements. For example, refer to... Figure 5 As shown, a stepped structure is formed between the first part 21 and the second part 22 in the width direction. For example, refer to... Figure 6 As shown, a slope is formed in the width direction between the first part 21 and the second part 22. For example, refer to... Figure 7 As shown, there is a smooth transition in the width direction between the first part 21 and the second part 22.

[0065] The connection method between the first part 21 and the second part 22 can be specifically set according to the width of the first part 21 and the width of the second part 22. For example, if the change between the first part 21 and the second part 22 is less than 20%, the first part 21 is directly widened relative to the second part 22, thus forming a stepped structure. Alternatively, if the change between the first part 21 and the second part 22 is between 20% and 40%, a slope or smooth transition is formed between the first part 21 and the second part 22 in the width direction.

[0066] In the production of the solar cell in this embodiment, a corresponding screen can be used. Specifically, the screen is widened and thickened in the region corresponding to the first part 21. In this way, the printed current collector electrode 20 can be widened and heightened in the first region 13. The screen is narrowed in the region corresponding to the second part 22 to narrow the line width of the current collector electrode 20 in the second region 14. This achieves the goal of widening the printed current collector electrode 20 in high-risk areas and narrowing the printed current collector electrode 20 in low-risk areas, based on the probability of grid breakage in different regions on the surface of the solar cell.

[0067] The thickened screen increases the amount of ink deposited, effectively increasing the cross-sectional area of ​​the current collector electrode 20. According to the mechanics of materials formula, bending strength is proportional to the square of the cross-sectional height; therefore, increasing the height of the current collector electrode 20 increases its mechanical strength. The thicker screen better maintains the opening shape, reducing deformation during printing. Furthermore, the thickened current collector electrode 20 more effectively disperses lamination and thermal stress, resulting in higher reliability. Therefore, increasing the height of the current collector electrode 20 leads to higher conductivity reliability.

[0068] In some possible implementations, the strength of the current collector 20 in the first region 13 can also be improved in other ways. For example, a remelting strengthening technique can be used on the current collector 20 located in the first region 13, where laser pulses induce local remelting at an ultra-high temperature gradient on the surface of the current collector 20 to eliminate voids and enhance the strength of the current collector 20. Another example is the optimization of the conductivity and strength of the current collector 20 using magnetic field-oriented alignment.

[0069] In this embodiment of the solar cell, the cell body 10 is divided into at least one side of a first region 13 and a second region 14 according to the breakage probability of the current collector electrode 20. The width of the current collector electrode 20 located in the first region 13 is set to be greater than the width of the current collector electrode 20 located in the second region 14. That is, by widening the current collector electrode 20 in the high-risk breakage region and narrowing the line width of the current collector electrode 20 in the low-risk breakage region, the light shading loss is minimized while ensuring the strength and conductivity reliability of the current collector electrode 20, thereby improving the yield and efficiency of the solar cell.

[0070] This application also provides a photovoltaic module, which includes at least one battery string, an encapsulation layer, and a cover plate; the battery string is formed by connecting multiple solar cells as described above through interconnecting strips; the encapsulation layer is used to cover the surface of the battery string; and the cover plate is used to cover the surface of the encapsulation layer away from the battery string.

[0071] Since the photovoltaic module uses the aforementioned solar cell, at least one side of the solar cell is provided with a first region 13 and a second region 14. The probability of breakage of the collector electrode 20 on the first region 13 is higher than that of the collector electrode 20 on the second region 14. The width of the collector electrode 20 located in the first region 13 is set to be greater than the width of the collector electrode 20 located in the second region 14. That is, the collector electrode 20 is widened in the high-risk area of ​​breakage and narrowed in the low-risk area of ​​breakage. While ensuring the conductivity reliability of the collector electrode 20, the shading loss is minimized. In this way, the efficiency of the photovoltaic module is effectively improved.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For embodiments of devices, electronic devices, computer-readable storage media, and computer program products containing instructions, the descriptions are relatively simple because they are basically similar to the method embodiments; relevant parts can be referred to the descriptions of the method embodiments.

[0074] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A solar cell, characterized in that, include, A battery cell body (10) has at least one side having a first region (13) and a second region (14). The first region (13) is disposed around the edge of the battery cell body (10), and the second region (14) is disposed in the middle of the battery cell body (10). The first region (13) is located between the second region (14) and the adjacent edge. Multiple current collector electrodes (20) are disposed on at least one side of the battery cell body (10). The multiple current collector electrodes (20) are arranged at intervals along a first direction (X), and each current collector electrode (20) extends along a second direction (Y). The first direction (X) and the second direction (Y) intersect. The width of the current collector (20) located in the first region (13) is greater than the width of the current collector (20) located in the second region (14).

2. The solar cell according to claim 1, characterized in that, In the second direction (Y), the width of the battery cell body (10) is L1, and the width of the first region (13) on one side of the second region (14) is L2, satisfying that 6%L1≤L2≤9%L1.

3. The solar cell according to claim 1, characterized in that, In the first direction (X), the length of the battery cell body (10) is L3, and the width of the first region (13) on one side of the second region (14) is L4, satisfying that 2.5%L3≤L4≤5%L3.

4. The solar cell according to claim 1, characterized in that, In the second direction (Y), the width of the first region (13) on one side of the second region (14) is L2; ​​in the first direction (X), the width of the first region (13) on one side of the second region (14) is L4, satisfying 0.2L2≤L4≤L2.

5. The solar cell according to claim 1, characterized in that, The solar cell also includes a plurality of busbars (60), which are disposed on at least one side of the cell body (10) and are connected to the current collector (20). The battery cell body (10) has two first sides (11) parallel to the first direction (X), a d-th group of busbars (60) close to the adjacent first side (11), and the area between the adjacent first side (11) is the first area (13), where d is one of 1, 2, or 3.

6. The solar cell according to claim 1, characterized in that, The first region (13) includes a first sub-region (131) and a second sub-region (132). The first sub-region (131) is located at the top corner of the battery cell body (10). The remaining part of the first region (13) excluding the first sub-region (131) is the second sub-region (132). The width of the collector electrode (20) located in the first sub-region (131) is greater than the width of the collector electrode (20) located in the second sub-region (132).

7. The solar cell according to claim 6, characterized in that, The width of the collector electrode (20) located in the first sub-region (131) is W3, the width of the collector electrode (20) located in the second sub-region (132) is W4, and the width of the collector electrode (20) located in the second region (14) is W2, 1.45W2≥W3≥1.35W2; and / or, 1.1W2≥W4≥1.05W2.

8. The solar cell according to claim 6, characterized in that, The width of the battery cell body (10) in the second direction (Y) is L1, and the width of each first sub-region (131) in the second direction (Y) is L5, satisfying that 0.3%L1≤L5≤2%L1; and / or, The length of the battery cell body (10) in the first direction (X) is L3, and the length of each of the first sub-regions (131) in the first direction (X) is L6, satisfying that 1.2%L3≤L6≤2.5%L3.

9. The solar cell according to claim 1, characterized in that, The width of the current collector (20) located in the first region (13) is W1, and the width of the current collector (20) located in the second region (14) is W2, satisfying that 1.4W2≥W1≥1.05W2; and / or, The height of the current collector (20) located in the first region (13) is H1, and the height of the current collector (20) located in the second region (14) is H2, satisfying that 1.1H2≥H1≥1.05H2.

10. The solar cell according to claim 1, characterized in that, The maximum width of the current collector (20) located within the first region (13) is W1, satisfying that 45μm ≥ W1 ≥ 30μm; and / or, The maximum width of the current collector (20) located in the second region (14) is W2, which satisfies that 30μm≥W2≥20μm.

11. The solar cell according to claim 1, characterized in that, The current collector electrode (20) has a first part (21) at its widest point in the first region (13) and a second part (22) at its widest point in the second region (14), with a stepped structure formed between the first part (21) and the second part (22) in the width direction; or, A slope is formed between the first part (21) and the second part (22) in the width direction; or, The first part (21) and the second part (22) have a smooth transition in the width direction.

12. A photovoltaic module, characterized in that, Includes the solar cell as described in any one of claims 1 to 11.

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