Solar cell and solar cell module

Abstract

The utility model provides a solar cell sheet and a solar cell assembly, the solar cell sheet is provided with a front surface, a back surface and a side peripheral wall surface, the front surface and the back surface are oppositely arranged, and the side peripheral wall surface is located between the front surface and the back surface and is respectively connected with the front surface and the back surface; the side peripheral wall surface comprises at least one cutting surface, the cutting surface is provided with a first light absorption area and two second light absorption areas which are located on the two sides of the first light absorption area respectively in the first direction, and the roughness of the second light absorption areas is larger than that of the first light absorption area; the linear length of the second light absorption area in the first direction is 0.04%-2.0% of the linear length of the cutting face in the first direction. And the first direction is the length direction of the solar cell. Different roughness distributions are formed in different areas of the cutting surface, and the size of the cutting surface is regulated and controlled, so that the reflection range and the intensity of light are increased, and the light absorption amount is improved.

Description

Technical Field

[0001] This utility model belongs to the field of solar cells and relates to a solar cell and a solar cell module. Background Technology

[0002] Currently, to improve photoelectric conversion efficiency, technologies such as lasers are used in the battery manufacturing process to cut a complete solar cell into multiple narrower segments, which are then connected in series to form a single cell. Common segmentation types include two-segment, three-segment, and four-segment cells, etc. This increases the effective light absorption area, and by shortening the current flow distance, it also reduces resistance loss. The reliability and mechanical properties of the segmented cells are both improved.

[0003] The cut surface formed after slicing can absorb incident light, thereby improving current collection efficiency and greatly increasing the overall light energy utilization rate of the battery. CN119092571A discloses a solar cell and its preparation method, as well as a photovoltaic module, including at least two of the aforementioned segmented cells, formed by dividing the same whole solar cell along a first direction. An inclined cross-section is designed on the segmented cells, interacting with the passivation layer on the cross-section, improving the photoelectric conversion efficiency of the solar cell. CN208580749U discloses a cell for a stacked photovoltaic module and a stacked photovoltaic module, having at least two segmented areas for cutting to form segments, and a scribing blank area located between two adjacent segmented areas. Each segmented area includes a cell segment, the front side of which has a nano-textured surface, enabling multiple absorption of light, resulting in low light reflectivity and high light energy utilization.

[0004] The significant morphological differences between different regions of the cut surface of a slab solar cell result in unstable light absorption. Therefore, in-depth development of the cut surface structure after cell slab formation is crucial for improving the light absorption performance of the cells. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a solar cell and solar cell module, which increases the light reflection range and intensity by adjusting the roughness of different areas of the cut surface, thereby improving the light absorption rate of the solar cell.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a solar cell having a front surface, a back surface, and a side peripheral wall. The front surface and the back surface are disposed opposite to each other, and the side peripheral wall is located between the front surface and the back surface, and connects the front surface and the back surface respectively. The side peripheral wall includes at least one cut surface, the cut surface having a first light-absorbing area and two second light-absorbing areas located on both sides of the first light-absorbing area along a first direction. The roughness of the second light-absorbing areas is greater than the roughness of the first light-absorbing areas, and the linear length of the second light-absorbing areas in the first direction is 0.04% to 2.0% of the linear length of the cut surface in the first direction. The first direction is the length direction of the solar cell.

[0008] The linear length of the second light-absorbing region in the first direction is 0.04% to 2.0% of the linear length of the cut surface in the first direction. For example, it can be 0.04%, 0.05%, 0.08%, 0.10%, 0.20%, 0.50%, 1.00%, 1.20%, 1.50%, 1.60%, 1.80%, or 2.00%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0009] As a preferred embodiment of this utility model, the ratio of the roughness of the first light-absorbing region to the roughness of the second light-absorbing region is 1:(1~10), and is not 1:1. For example, it can be 1:1.05, 1:1.5, 1:2.0, 1:3.0, 1:4.0, 1:5.0, 1:6.0, 1:7.0, 1:8.0, 1:9.0 or 1:10.0, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0010] In this invention, the surface of the second light-absorbing region is rougher than that of the first light-absorbing region, exhibiting an uneven structure, which is beneficial to improving the light absorption rate of the solar cell.

[0011] As a preferred embodiment of the present invention, the linear length of the first light-absorbing area in the first direction is 150~250mm, for example, it can be 150mm, 160mm, 180mm, 196mm, 200mm, 210mm, 220mm, 230mm, 240mm or 250mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0012] The linear length of the second light-absorbing region in the first direction is 0.1 to 3.0 mm, for example, it can be 0.1 mm, 0.5 mm, 1.0 mm, 1.2 mm, 1.5 mm, 2.0 mm, 2.5 mm, 2.8 mm or 3.0 mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0013] It should be noted that the linear length refers to the straight-line distance parallel to the first direction between the connection point of the cut surface and the chamfer and the connection point of the first light-absorbing area and the second light-absorbing area.

[0014] As a preferred embodiment of this invention, the roughness of a portion of the second light-absorbing region near the front surface is less than the roughness of a portion of the region near the back surface.

[0015] As a preferred embodiment of the present invention, the side peripheral wall surface further includes two chamfers located on both sides of the cut surface along the first direction.

[0016] The second light-absorbing region includes a near-light portion and a recessed portion arranged sequentially along a second direction. Both the near-light portion and the recessed portion extend along a first direction and independently connect the chamfer to the first light-absorbing region. The near-light portion is disposed close to the front surface, and the recessed portion is disposed close to the back surface and recessed into the solar cell. The roughness of the near-light portion is less than the roughness of the recessed portion.

[0017] The second direction is perpendicular to the first direction.

[0018] That is, in this utility model, the second direction refers to the direction from the front surface to the back surface.

[0019] As a preferred embodiment of this utility model, the ratio of the roughness of the near-light portion to the roughness of the recessed portion is 1:(1~2), and is not 1:1. For example, it can be 1:1.05, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9 or 1:2.0, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0020] As a preferred embodiment of this utility model, the area of ​​the recessed portion is less than or equal to 30% of the area of ​​the second light-absorbing region. For example, it can be 5%, 10%, 12%, 15%, 18%, 20%, 23%, 25%, or 30%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0021] The linear length of the recess in the first direction is 0.1% to 1.0% of the linear length of the cut surface in the first direction. For example, it can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1.0%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0022] The linear length of the recess in the second direction is 10% to 20% of the linear length of the cut surface in the second direction. For example, it can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0023] This invention controls the size of the recessed area within the aforementioned range. On the one hand, it avoids the incident light being refracted through the chamfered position due to an excessively wide recess, which would increase the diffuse reflection range and intensity of the light and reduce the light absorption rate. On the other hand, it prevents the incident light from being directly transmitted through the chamfered position through the back of the battery due to an excessively narrow recess, which would reduce the diffuse reflection range and intensity of the light and reduce the light absorption rate.

[0024] As a preferred embodiment of the present invention, the near-light section is provided with a plurality of first ribs extending along a second direction; the plurality of first ribs are arranged at intervals along a first direction, and the distance between two adjacent first ribs gradually decreases from the first light-absorbing area toward the chamfer; the first ribs are curved, and one end of them near the back surface is inclined toward the first light-absorbing area.

[0025] This invention adjusts the spacing of the first ribs, thereby increasing the roughness of the area near the chamfer on the cut surface, increasing diffuse reflection at the chamfer position, and thus improving light absorption rate.

[0026] The recessed portion is provided with several protrusions.

[0027] As a preferred embodiment of this utility model, the low beam portion is further provided with a plurality of second ribs extending along a second direction, and the plurality of second ribs are spaced apart along a first direction; the inclination direction of the second ribs is opposite to the inclination direction of the first ribs; and some of the second ribs intersect with some of the first ribs.

[0028] As a preferred embodiment of this invention, at least one passivation layer is provided on the cut surface.

[0029] Secondly, this utility model provides a solar cell module, which includes the solar cell described in the first aspect.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0031] This utility model provides a solar cell and solar cell module that, by adjusting different light-absorbing areas to have different rough surfaces, improves the diffuse reflection range and intensity of incident light, allowing more light to be reflected into the light-absorbing area of ​​the cut surface after beveling, effectively increasing the amount of absorbed light and improving the photoelectric conversion efficiency of the solar cell. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the solar cell provided in Example 1.

[0033] Figure 2 A scanning electron microscope image of the first light-absorbing region of the solar cell provided in Example 1 at 250x magnification.

[0034] Figure 3 A scanning electron microscope image of the second light-absorbing region of the solar cell provided in Example 1 at 600x magnification.

[0035] Figure 4 This is a schematic diagram of the structure of the solar cell provided in Example 2.

[0036] Figure 5 A side view of the solar cell provided in Example 2.

[0037] Figure 6 This is a front view of the solar cell provided in Example 2.

[0038] Figure 7 A scanning electron microscope image of the second light-absorbing region of the solar cell provided in Example 2 at 120x magnification.

[0039] Among them, 100-solar cell; 101-front surface; 102-back surface; 103-side peripheral wall; 1-cut surface; 11-first light-absorbing area; 111-fine lines; 12-second light-absorbing area; 121-protruding ribs; 122-near light part; 123-recessed part; 2-chamfer. Detailed Implementation

[0040] It should be understood that in the description of this utility model, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] In one specific embodiment, this utility model provides a solar cell having a front surface, a back surface, and side peripheral walls. The front surface and the back surface are disposed opposite to each other, and the side peripheral walls are located between the front surface and the back surface, respectively connecting the front surface and the back surface. The side peripheral walls include at least one cut surface, which is formed by cutting the solar cell to prepare two-piece, four-piece, or other types of solar cells. The cut surface has a first light-absorbing region and two second light-absorbing regions located on both sides of the first light-absorbing region along a first direction. The linear length of the second light-absorbing regions in the first direction is 0.04% to 2.0% of the linear length of the cut surface in the first direction. The roughness of the second light-absorbing regions is greater than the roughness of the first light-absorbing regions. The first direction is the length direction of the solar cell. Light enters from the front surface of the solar cell and is reflected by a chamfer to the cut surface, where it is absorbed by the light-absorbing regions with rough surfaces.

[0043] It should be noted that the linear length of the cutting surface in the first direction mentioned in this utility model refers to the sum of the linear length of the first light-absorbing area in the first direction and the linear length of the two second light-absorbing areas in the first direction.

[0044] In some embodiments, the roughness ratio of the first light-absorbing region to the roughness of the second light-absorbing region is 1:(1~10), and is not 1:1.

[0045] To meet the surface roughness requirements of the cut surface, the present invention provides the following exemplary solutions.

[0046] (1) The surface of the first light-absorbing area is smooth, and the surfaces of the two second light-absorbing areas on both sides are provided with protruding ribs or arched protrusions, so that the surface roughness of the second light-absorbing area is greater than that of the first light-absorbing area.

[0047] (2) The surface of the first light-absorbing area is provided with fine lines, and the surfaces of the two second light-absorbing areas on both sides are provided with protruding ribs or arched protrusions. The protruding ribs refer to stripe structures that are more prominent than the fine lines, and can be straight stripes or curved stripes. The roughness of the rough surface formed by the protruding ribs is greater than the roughness of the rough surface formed by the fine lines in the first light-absorbing area. The arched protrusions refer to raised structures that are more prominent and / or more dense than the fine lines. The roughness of the rough surface formed by the arched protrusions is greater than the roughness of the rough surface formed by the fine lines in the first light-absorbing area.

[0048] (3) The cut surface is provided with a plurality of protrusions, which are unevenly distributed in the first light-absorbing area and the second light-absorbing area. The protrusions can be circular protrusions, dispersed in the cut area, and the density of protrusions in the second light-absorbing area is greater than the density of protrusions in the first light-absorbing area, to ensure that the surface roughness of the second light-absorbing area is greater than that of the first light-absorbing area. The roughness of this invention is obtained by testing with a Zeta potentiometer.

[0049] Specifically, the linear length of the first light-absorbing area in the first direction is 150~250mm, and the linear length of the second light-absorbing area in the first direction is 0.1~3.0mm. The linear length refers to the straight-line distance parallel to the first direction between the connection point of the cut surface and the chamfer and the connection point of the first and second light-absorbing areas. The linear lengths of the two second light-absorbing areas on either side of the first light-absorbing area may be equal or unequal.

[0050] In some embodiments, the roughness of a portion of the second light-absorbing region near the front surface is less than the roughness of a portion of the region near the back surface.

[0051] The side peripheral wall also includes two chamfers located on both sides of the cut surface along a first direction. The two chamfers are formed on both sides of the cut surface along the length of the solar cell. The first light-absorbing area of ​​the cut surface is located in the middle of the cut surface, and the two second light-absorbing areas are respectively connected to the two chamfers located on both sides.

[0052] In some embodiments, the second light-absorbing region includes a near-light portion and a recessed portion arranged sequentially along a second direction. Both the near-light portion and the recessed portion extend along a first direction and independently connect the chamfer to the first light-absorbing region. The near-light portion is disposed close to the front surface, and the recessed portion is disposed close to the back surface and recessed into the solar cell, resulting in a height difference between the near-light portion and the recessed portion. The roughness of the near-light portion is less than the roughness of the recessed portion. The second direction is perpendicular to the first direction. The second direction is the direction from the front surface to the back surface.

[0053] The ratio of the roughness of the near-light portion to the roughness of the recessed portion is 1:(1~2), and is not 1:1.

[0054] Furthermore, the near-light section is provided with a plurality of first ribs extending along a second direction. These first ribs are spaced apart along a first direction, and the distance between two adjacent first ribs gradually decreases from the first light-absorbing area towards the chamfer. This causes the roughness of the near-light section to gradually increase from the first light-absorbing area towards the chamfer, thereby increasing diffuse reflection of light at the chamfer location and thus increasing light absorption. The first ribs are curved, with one end near the back surface inclined towards the first light-absorbing area. The inclination direction of the plurality of first ribs is the same, and their inclination angle is 90°~180°, but not exactly 90° or 180°.

[0055] Furthermore, the low beam section is also provided with a plurality of second ribs extending along a second direction, and the plurality of second ribs are spaced apart along a first direction. The inclination direction of the second ribs is opposite to the inclination direction of the first ribs, and some of the second ribs intersect with some of the first ribs. The inclination angle of the second ribs is 0° to 90°, and is not 0° or 90°.

[0056] The recessed portion is provided with several protrusions, forming an uneven structure, and its roughness is greater than that of the near-light portion.

[0057] In some embodiments, the area of ​​the recess is less than or equal to 30% of the area of ​​the second light-absorbing region.

[0058] The recess is quadrilateral in shape. The linear length of the recess in the first direction is 0.1% to 1.0% of the linear length of the cutting surface in the first direction; the linear length of the recess in the second direction is 10% to 20% of the linear length of the cutting surface in the second direction.

[0059] In some embodiments, at least one passivation layer is provided on the cut surface.

[0060] In another specific embodiment, the present invention provides a solar cell module, which includes a solar cell as described in a specific embodiment.

[0061] Example 1

[0062] This embodiment provides a solar cell 100, such as Figure 1 As shown, the solar cell 100 has a front surface 101, a back surface 102, and a side peripheral wall 103. The front surface 101 and the back surface 102 are disposed opposite each other, and the side peripheral wall 103 is located between the front surface 101 and the back surface 102, connecting the front surface 101 and the back surface 102 respectively. The side peripheral wall 103 includes at least one cut surface 1 and two chamfers 2 located on both sides of the cut surface 1. The length direction of the solar cell 100 is denoted as the first direction X. The cut surface 1 has a first light-absorbing area 11 and two second light-absorbing areas 12 located on both sides of the first light-absorbing area 11 along the first direction X. Figure 2 and Figure 3 As shown, the surface of the first light-absorbing region 11 is provided with fine textures 111, and the surfaces of the two second light-absorbing regions 12 on both sides are provided with protruding ribs 121, making the roughness of the second light-absorbing region 12 greater than that of the first light-absorbing region 11, and the ratio of the roughness of the first light-absorbing region 11 to the roughness of the second light-absorbing region 12 is 1:2. The linear length of the second light-absorbing region 12 in the first direction X is 1.0% of the linear length of the cutting surface 1 in the first direction X, specifically 2.0 mm, and the linear length of the first light-absorbing region 11 in the first direction X is 196 mm. The roughness of a portion of the second light-absorbing region 12 near the front surface 101 is less than the roughness of a portion of the second light-absorbing region near the back surface 102.

[0063] Example 2

[0064] This embodiment provides a solar cell 100, such as Figure 4 As shown, the solar cell 100 has a front surface 101, a back surface 102, and a side peripheral wall 103. The front surface 101 and the back surface 102 are disposed opposite each other, and the side peripheral wall 103 is located between the front surface 101 and the back surface 102, connecting the front surface 101 and the back surface 102 respectively. The side peripheral wall 103 includes at least one cut surface 1 and two chamfers 2 located on both sides of the cut surface 1. The longitudinal direction of the solar cell 100 is denoted as the first direction X. The cut surface 1 has a first light-absorbing area 11 and two second light-absorbing areas 12 located on both sides of the first light-absorbing area 11 along the first direction X. The direction from the front surface 101 of the solar cell 100 to the back surface 102 is denoted as the second direction Y, and the second direction Y is perpendicular to the first direction X. Figure 5As shown, the second light-absorbing region 12 includes a near-light portion 122 and a recessed portion 123 arranged sequentially along the second direction Y. Both the near-light portion 122 and the recessed portion 123 extend along the first direction X and are independently connected to the chamfer 2 and the first light-absorbing region 11, respectively. Figure 6 As shown, the near-light portion 122 is disposed near the front surface 101 of the solar cell 100, and the recessed portion 123 is disposed near the back surface 102 of the solar cell 100 and recessed into the solar cell 100 to form a height difference with the near-light portion 122. The area of ​​the recessed portion 123 is 25% of the area of ​​the second light-absorbing region 12. The linear length of the recessed portion 123 in the first direction X is 2.0 mm, and the linear length of the recessed portion 123 in the second direction Y is 20% of the linear length of the cut surface 1 in the second direction Y. Figure 7 As shown, the recessed portion 123 is provided with multiple protrusions to form an uneven structure. The low-light portion 122 is provided with multiple first ribs extending along the second direction Y, such that the roughness of the low-light portion 122 is less than the roughness of the recessed portion 123, and the ratio of the roughness of the low-light portion 122 to the roughness of the recessed portion 123 is 1:2. The multiple first ribs on the low-light portion 122 are arranged at intervals along the first direction X, and the spacing between two adjacent first ribs gradually decreases from the first light-absorbing area 11 towards the chamfer 2, such that the roughness of the low-light portion 122 gradually increases from the first light-absorbing area 11 towards the chamfer 2. The first ribs are curved, and their ends near the back surface 102 are inclined towards the first light-absorbing area 11.

[0065] Example 3

[0066] This embodiment provides a solar cell 100, which differs from Embodiment 2 in that: the near-light section is further provided with a plurality of second ribs extending along a second direction, the plurality of second ribs are spaced apart along a first direction X, the tilt direction of the second ribs is opposite to the tilt direction of the first ribs, and some of the second ribs intersect with some of the first ribs, the rest of the structure is the same as that of Embodiment 2.

[0067] Example 4

[0068] This embodiment provides a solar cell, including the solar cell in Embodiment 1, wherein a passivation layer is disposed on the cut surface of the solar cell.

[0069] Example 5

[0070] This embodiment provides a solar cell, including the solar cell in Embodiment 2, wherein two passivation layers are disposed on the cut surface of the solar cell.

[0071] Example 6

[0072] This embodiment provides a solar cell, including the solar cell in Embodiment 3, wherein a passivation layer is disposed on the cut surface of the solar cell.

[0073] Comparative Example 1

[0074] This comparative example provides a solar cell that differs from Example 1 in that the surface roughness of the cut surface is uniform, and the roughness of each region is the same.

[0075] Comparative Example 2

[0076] This comparative example provides a solar cell, including the solar cell in Comparative Example 1, wherein a passivation layer and an anti-reflection layer are disposed on the cut surface of the solar cell.

[0077] Compared to the solar cell provided in Comparative Example 2, the solar cells in Examples 4-6 of this invention use solar cell sheets with cut surfaces having a specific roughness distribution, which allows incident light passing through the chamfer of the solar cell sheet to be fully reflected to the light-absorbing area, greatly increasing the amount of light absorbed. This not only improves the battery power but also improves the battery short-current.

[0078] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A solar cell, characterized by, The solar cell has a front surface, a back surface and a side wall surface, the front surface and the back surface are oppositely arranged, and the side wall surface is located between the front surface and the back surface and connects the front surface and the back surface respectively; The side wall surface comprises at least one cutting surface, the cutting surface has a first light absorption area and two second light absorption areas respectively located on both sides of the first light absorption area along a first direction, the roughness of the second light absorption area is greater than the roughness of the first light absorption area, and the linear length of the second light absorption area in the first direction is 0.04%-2.0% of the linear length of the cutting surface in the first direction; The first direction is the length direction of the solar cell.

2. The solar cell according to claim 1, wherein The ratio of the roughness of the first light absorption area to the roughness of the second light absorption area is 1:(1-10), and is not 1:

1.

3. The solar cell according to claim 1 or 2, characterized in that, The linear length of the first light absorption area in the first direction is 150-250 mm; The linear length of the second light absorption area in the first direction is 0.1-3.0 mm.

4. The solar cell of claim 1, wherein, The roughness of the part of the second light absorption area close to the front surface is less than the roughness of the part of the second light absorption area close to the back surface.

5. The solar cell of claim 1, wherein, The side wall surface further comprises two chamfers respectively located on both sides of the cutting surface along the first direction; The second light absorption area comprises a near-light part and a recess part arranged in sequence along a second direction, the near-light part and the recess part both extend along the first direction and are independently connected with the chamfer and the first light absorption area respectively; The near-light part is arranged close to the front surface, and the recess part is arranged close to the back surface and recessed into the solar cell; The roughness of the near-light part is less than the roughness of the recess part; The second direction is perpendicular to the first direction.

6. The solar cell of claim 5, wherein, The ratio of the roughness of the near-light part to the roughness of the recess part is 1:(1-2), and is not 1:

1.

7. The solar cell according to claim 5 or 6, characterized in that, The area of the recess part is less than or equal to 30% of the area of the second light absorption area.

8. The solar cell according to claim 5 or 6, wherein The linear length of the recess part in the first direction is 0.1%-1.0% of the linear length of the cutting surface in the first direction; The linear length of the recess part in the second direction is 10%-20% of the linear length of the cutting surface in the second direction.

9. The solar cell according to claim 5 or 6, wherein, The near-light part is provided with a plurality of first ridges extending along the second direction; The plurality of first ridges are arranged at intervals along the first direction, and the interval between adjacent two first ridges gradually decreases from the first light absorption area to the chamfer; The first ridges are curved, and one end of each first ridge close to the back surface is arranged in an inclined manner towards the first light absorption area; The recess part is provided with a plurality of protrusions.

10. The solar cell of claim 9, wherein, The near-light part is further provided with a plurality of second ridges extending along the second direction, and the plurality of second ridges are arranged at intervals along the first direction; The inclination direction of the second ridges is opposite to the inclination direction of the first ridges; Part of the second ridges and part of the first ridges are arranged in intersection.

11. The solar cell of claim 1, wherein, The cutting surface is provided with at least one passivation layer.

12. A solar cell module characterized by comprising: The solar cell module comprises the solar cell according to any one of claims 1-11.

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