A solar cell structure, a split piece, a whole piece, a cell assembly and a photovoltaic system

Abstract

The application relates to the technical field of solar cells, and particularly discloses a solar cell structure, a split piece, a whole piece, a cell assembly and a photovoltaic system. The light-receiving surface of the cell main body comprises a main area and an edge area, the edge area comprises a first edge area and / or a second edge area; an isolation protective layer is arranged on the main area and the edge area and comprises a plurality of isolation adhesive strips arranged along a first direction, and each isolation adhesive strip is arranged along a second direction; the isolation protective layer comprises a base part located on the main area and a reinforcing part located on the edge area, W2>W1, wherein W1 and W2 are the widths of a single isolation adhesive strip in the base part and the reinforcing part along the first direction respectively. According to the application, the scratch and stress damage of the edge area can be effectively reduced as a whole, the positive influence caused by the reduction of the scratch and stress damage of the edge area can be dominant, and the cell conversion efficiency can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, and in particular to a solar cell structure, slabs, whole cells, cell modules, and photovoltaic systems. Background Technology

[0002] Currently, back-contact (BC) solar cells are increasingly widely used in the mainstream photovoltaic market. Their structural feature is that alternating P-type and N-type doped regions are formed on their back surface, and grid lines are printed on the P-type and N-type doped regions. The grid lines are also placed on the back surface of the cell. Since there are no grid lines blocking the light-receiving surface of the silicon wafer, it has the characteristics of high light utilization, high short-circuit current, and high open-circuit voltage, and is one of the future technological directions of high-efficiency crystalline silicon cells.

[0003] However, because the light-receiving surface of the battery is designed without grid lines, it is easily scratched by foreign objects such as conveyor belts and stacked battery cells during the later stages of battery manufacturing (such as testing, sorting, and packaging processes) and subsequent stacking, storage, transportation, and use. This damages the passivation layer on the light-receiving surface, affects the passivation effect, and consequently leads to a decrease in photoelectric conversion efficiency.

[0004] In existing technologies, to address the aforementioned technical problems, some battery products incorporate a separating adhesive layer on the light-receiving surface to protect the functional layers. However, in actual production, it has been found that the edge areas of the battery are more susceptible to scratches than the central area. Furthermore, during subsequent processes such as cell cutting and lamination, the edge areas are more prone to stress damage. Edge scratches exacerbate stress-induced damage, leading to decreased passivation effectiveness and increased degradation. Current separating adhesive layer designs do not provide enhanced protection for the battery edge areas, resulting in numerous scratches still appearing on the edges of battery products with a separating adhesive layer on the front, impacting photoelectric conversion efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a solar cell structure, slab, whole cell, cell module, and photovoltaic system in light of the existing technology.

[0006] The solar cell structure of the present invention can effectively reduce scratches and stress damage in the edge region, improve the passivation effect in the region, reduce recombination, and make the positive effect of reducing scratches and stress damage in the edge region dominant, thereby effectively improving the overall cell conversion efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: First, the present invention provides a solar cell structure, comprising: The battery body includes a light-receiving surface and a backlight surface arranged opposite to each other. The light-receiving surface includes a main area and an edge area. The edge area includes a first edge area and / or a second edge area. The first edge area is located on at least one side of the main area in a first direction, and the second edge area is located on at least one side of the main area in a second direction. The first direction and the second direction are arranged to intersect each other. An isolation and protective layer, disposed in the main region and the edge region, includes a plurality of isolation strips arranged along the first direction, and each isolation strip extends along the second direction. The isolation and protective layer includes a base portion located in the main region and a reinforcing portion located in the edge region. W2 > W1, In the formula, W1 is the width of a single insulating strip in the base portion in the first direction; W2 is the width of a single insulating strip in the reinforcing portion in the first direction.

[0008] In some embodiments, 1.17W1 < W2 ≤ 2.5W1, In the formula, W1 is the width of a single insulating strip in the base portion in the first direction; W2 is the width of a single insulating strip in the reinforcing portion in the first direction.

[0009] In some embodiments, the width W1 of a single insulating strip in the substrate portion in the first direction is 0.4 mm to 0.6 mm; and / or, The width W2 of a single insulating strip in the reinforced section in the first direction is 0.7mm to 1mm.

[0010] In some embodiments, H2 > H1, In the formula, H1 is the height of a single insulating strip in the base portion in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcing portion in the thickness direction of the battery body.

[0011] In some embodiments, 1.4H1 < H2 ≤ 2.4H1, In the formula, H1 is the height of a single insulating strip in the base portion in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcing portion in the thickness direction of the battery body.

[0012] In some embodiments, the height H1 of a single insulating strip in the substrate portion in the thickness direction of the battery body is 3μm~5μm; and / or, The height H2 of a single insulating strip in the reinforced section in the thickness direction of the battery body is 4μm~7μm.

[0013] In some embodiments, the second edge region includes a third sub-region and a fourth sub-region respectively disposed on both sides of the main region in a second direction, and the reinforcing portion includes a third unit located in the third sub-region and a fourth unit located in the fourth sub-region, wherein... 5%≤D3 / W≤25%, where D3 is the length of the third unit in the second direction; W is the width of the battery body in the second direction; and / or, 5%≤D4 / W≤25%, where D4 is the length of the fourth unit in the second direction; W is the width of the battery body in the second direction; and / or, 10%≤(D3+D4) / W≤50%, where D3 is the length of the third unit in the second direction; D4 is the length of the fourth unit in the second direction; and W is the width of the battery body in the second direction.

[0014] In some embodiments, the length D3 of the third unit in the second direction is 0.5cm to 2.5cm; and / or, The length D4 of the fourth unit in the second direction is 0.5cm to 2.5cm.

[0015] In some embodiments, the first edge region includes a first sub-region and a second sub-region respectively disposed on both sides of the main region in a first direction, and the reinforcing portion includes a first unit located in the first sub-region and a second unit located in the second sub-region, wherein... 1.1%≤D1 / L≤2.2%, where D1 is the relative distance between the two insulating strips located at opposite ends in the first direction of the first unit, and L is the length of the battery body in the first direction; and / or, 1.1%≤D2 / L≤2.2%, where D2 is the relative distance between the two insulating strips located at opposite ends of each other in the first direction in the second unit, and L is the length of the battery body in the first direction; and / or, 2.2%≤(D1+D2) / L≤4.4%, where D1 is the relative distance between the two insulating strips located at both ends of the first direction in the first unit and moving away from each other to one side, D2 is the relative distance between the two insulating strips located at both ends of the first direction in the second unit and moving away from each other to one side, and L is the length of the battery body in the first direction.

[0016] In some embodiments, the relative distance D1 between the two insulating strips located at both ends in the first direction of the first unit, away from each other on one side, is 2mm to 4mm; and / or, The relative distance D2 between the two insulating strips located at both ends of the first direction in the second unit is 2mm~4mm.

[0017] In some embodiments, the coverage area of ​​the isolation and protection layer accounts for 31% to 50% of the total area, based on the area of ​​the light-receiving surface.

[0018] In some embodiments, the first edge region includes a first sub-region and a second sub-region respectively disposed on both sides of the main region in a first direction, and the reinforcing portion includes a first unit located in the first sub-region and a second unit located in the second sub-region, wherein... 4.5%≤(S1+S2) / S0≤17%, In the formula, S1 is the coverage area of ​​the first unit; S2 is the coverage area of ​​the second unit; and S0 is the coverage area of ​​the base portion.

[0019] In some embodiments, the second edge region includes a third sub-region and a fourth sub-region respectively disposed on both sides of the main region in a second direction, and the reinforcing portion includes a third unit located in the third sub-region and a fourth unit located in the fourth sub-region, wherein... 13%≤(S3+S4) / S0≤250%, In the formula, S3 is the coverage area of ​​the third unit; S4 is the coverage area of ​​the fourth unit; and S0 is the coverage area of ​​the base portion.

[0020] In some embodiments, on the same side of the battery body in the first direction, the distance between the outer edge of the light-receiving surface extending along the second direction and the reinforcing portion on that side is d1, where d1 < 0.5 mm; and / or, On the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the reinforcing part on the same side is d2, where d2 < 0.5 mm.

[0021] In some embodiments, on the same side of the battery body in the first direction, the distance d1 between the outer edge of the light-receiving surface extending along the second direction and the reinforcing portion on that side is 0.05mm ≤ d1 < 0.5mm; and / or, On the same side of the battery body in the second direction, the distance d2 between the outer edge of the light-receiving surface extending along the first direction and the reinforcing part on the same side is 0.05mm≤d2<0.5mm.

[0022] In some embodiments, in the reinforcing portion, the spacing between adjacent insulating strips in the first direction is 0.5mm to 2mm.

[0023] In some embodiments, the light transmittance of the isolation and protective layer is greater than or equal to 92%; and / or, The isolation and protective layer is made of insulating material.

[0024] In some embodiments, the backlight surface includes a plurality of fine grids arranged along the second direction, and each of the fine grids extends along the first direction.

[0025] In some embodiments, in the thickness direction of the battery body, the overlapping area between the orthographic projection of a single insulating strip and the orthographic projection of a single fine grid in the substrate is at least 0.01 mm. 2 .

[0026] In some embodiments, 0.1W1 < W3 ≤ 0.75W1, In the formula, W1 is the width of a single insulating strip in the substrate in the first direction; W3 is the width of a single fine grid in the second direction.

[0027] In some embodiments, the isolation and protective layer further includes at least one longitudinal adhesive strip, which extends along the first direction and connects at least two isolation adhesive strips.

[0028] In some embodiments, there is an overlapping area between the longitudinal adhesive strip and the isolation adhesive strip to which it is connected; or... The longitudinal adhesive strip and the isolation adhesive strip connected to it are integrally formed.

[0029] In some embodiments, the longitudinal adhesive strip is disposed in the edge region and, on the same side of the battery body in the second direction, the longitudinal adhesive strip extends at least partially from the second edge region to the first edge region and is connected to the reinforcing portion located in the first edge region and the reinforcing portion located in the second edge region, respectively.

[0030] In some embodiments, the junction between the longitudinal adhesive strip and the reinforcing portion located in the first edge region at least partially covers the corner of the battery body.

[0031] In some embodiments, on the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the longitudinal adhesive strip on the side thereon is d3, where d3 < 0.5 mm.

[0032] In some embodiments, the backlight surface includes a metallized pattern layer, and the light-receiving surface is provided with an identification mark for identifying the metallized pattern layer.

[0033] In some embodiments, the identification marker includes any one or more combinations of text markers, color markers, and graphic markers.

[0034] Second, the present invention provides a solar cell slab, including the solar cell structure described above.

[0035] Third, the present invention provides a complete solar cell, including the solar cell structure described above.

[0036] Fourth, the present invention provides a complete solar cell, comprising preset segmented regions arranged in an array, with preset dividing lines between adjacent preset segmented regions, and each preset segmented region comprising one of the above-mentioned solar cell structures.

[0037] Fifth, the present invention provides a solar cell module, including the aforementioned solar cell structure; or, This includes one type of solar cell slab segmentation as described above; or, This includes the aforementioned type of complete solar cell.

[0038] Sixth, the present invention provides a solar cell module, including a first cell and a second cell arranged adjacent to each other along the second direction, wherein both the first cell and the second cell include the above-described solar cell structure; In the battery structure, on the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the second edge region on that side is called the second distance. The first battery cell and the second battery cell are stacked on their adjacent sides to form a stacked region, and the width of the stacked region in the second direction is greater than the second spacing.

[0039] In some embodiments, in the battery structure, the second edge region includes a third sub-region and a fourth sub-region respectively disposed on both sides of the main region in a second direction, and the reinforcing portion includes a third unit located in the third sub-region and a fourth unit located in the fourth sub-region. The orthographic projection of the third unit corresponding to the first battery cell in the thickness direction of the first battery cell at least partially coincides with the stacked region. 6.25L1≤D3+d2≤42.5L1, In the formula, D3 is the length of the third unit in the second direction; d2 is the second spacing; and L1 is the width of the stacked region in the second direction.

[0040] Sixth, the present invention provides a photovoltaic system including the above-mentioned solar cell module.

[0041] The beneficial effects of this invention are as follows: In this invention, an isolation and protective layer comprising a plurality of insulating strips spaced apart along a first direction is provided on the light-receiving surface of the battery body. Differential designs are applied to the main area of ​​the light-receiving surface and the edge areas located on at least one side of the main area. The width W2 of a single insulating strip corresponding to the reinforced portion of the isolation and protective layer in the edge area is greater than the width W1 of a single insulating strip corresponding to the base portion in the main area; that is, W2 > W1. Through this design, on the one hand, the edge area can be more fully covered by the isolation and protective layer, effectively improving its protective effect on the passivation layer and other front functional layers in that area. Simultaneously, the widened design of the reinforced portion in the edge area allows the stress borne to be distributed over a larger area during lamination, stacking, or other processes subject to external pressure, reducing the unit stress. The pressure borne by the area effectively reduces stress-induced damage, thereby significantly reducing scratches and stress damage in the edge areas, improving passivation, reducing recombination, and ultimately improving battery conversion efficiency. On the other hand, since the light-receiving surface is covered with an insulating protective layer, it will cause some optical loss. In this invention, only the width W2 of the single insulating strip corresponding to the reinforced part of the edge area is widened, while the width W1 of the single insulating strip corresponding to the base part of the main area is kept relatively small. This ensures that each area of ​​the light-receiving surface of the battery structure is effectively protected while reducing overall optical loss, so that the positive impact of reducing scratches and stress damage in the edge areas can dominate, thereby effectively improving the overall battery conversion efficiency. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a solar cell structure according to an embodiment of the present invention.

[0043] Figure 2 This is a schematic diagram of a solar cell slab structure according to an embodiment of the present invention.

[0044] Figure 3 for Figure 2 A magnified view of part A.

[0045] Figure 4 This is a cross-sectional view of the isolation and protective layer along the thickness direction of the battery body in an embodiment of the present invention.

[0046] Figure 5 This is a schematic diagram of the backlight surface according to an embodiment of the present invention.

[0047] Figure 6 This is a schematic diagram of the structure of the stacked region of the first and second battery cells according to an embodiment of the present invention.

[0048] Figure 7 This is a schematic diagram of the structure of the identification mark in an embodiment of the present invention.

[0049] Figure 8 This is a schematic diagram of the structure of a complete solar cell (with identification markings) according to an embodiment of the present invention.

[0050] Figure 9 This is a schematic diagram of the structure of a complete solar cell (without a pre-defined segmented area) according to an embodiment of the present invention.

[0051] Figure 10 This is a schematic diagram of the structure of a complete solar cell (with longitudinal adhesive strips) according to an embodiment of the present invention.

[0052] Figure 11 for Figure 10 A magnified view of a portion of the image.

[0053] Figure 12 This is a schematic diagram of the structure of the second unit of the battery cell in Embodiment 1 of the present invention.

[0054] Figure 13 This is a schematic diagram of the structure of the third unit of the battery cell in Embodiment 1 of the present invention.

[0055] Figure 14 This is a schematic diagram of the edge of the battery cell in Comparative Example 1.

[0056] Figure 15 This is a schematic diagram of the other edge of the battery cell in Comparative Example 1.

[0057] Figure 16 This is a schematic diagram of the adhesive surface at the edge of the battery cell in Comparative Example 1. The recessed areas in the diagram represent scratches.

[0058] In the picture: Main region 11, edge region 12, first edge region 12A, second edge region 12B, first sub-region 121, second sub-region 122, third sub-region 123, fourth sub-region 124; 2. Isolation and protective layer, 21. Substrate, 22. Reinforcing part, 221. First unit, 222. Second unit, 223. Third unit, 224. Fourth unit, 224. Longitudinal adhesive strip, 23. Fine grid 3; Identification marker 4; Preset segmentation area 10, layered area 13. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0060] In the description of this invention, the terms "first," "second," "third," "fourth," 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. Therefore, a feature defined with "first," "second," "third," "fourth," etc., may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" or "a number" means two or more, unless otherwise explicitly specified.

[0061] In the description of this invention, unless otherwise expressly specified and limited, the term "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0062] First, see Figures 1 to 3 As shown, an embodiment of the present invention discloses a solar cell structure, comprising: The battery body includes a light-receiving surface and a backlight surface arranged opposite to each other. The light-receiving surface includes a main region 11 and an edge region 12. The edge region 12 includes a first edge region 12A and / or a second edge region 12B. The first edge region 12A is located on at least one side of the main region 11 in a first direction, and the second edge region 12B is located on at least one side of the main region 11 in a second direction. The first direction and the second direction are arranged to intersect each other. The isolation and protective layer 2 is disposed in the main region 11 and the edge region 12, and includes a plurality of isolation strips arranged along a first direction. Each isolation strip extends along a second direction. The isolation and protective layer 2 includes a base portion 21 located in the main region 11 and a reinforcing portion 22 located in the edge region 12. W2 > W1, In the formula, W1 is the width of a single insulating strip in the base part 21 in the first direction; W2 is the width of a single insulating strip in the reinforcing part 22 in the first direction.

[0063] In this invention, an isolation protective layer 2, comprising a plurality of insulating strips spaced apart along a first direction, is provided on the light-receiving surface of the battery body. Differential designs are applied to the main area 11 of the light-receiving surface and the edge areas 12 located on at least one side of the main area 11. The width W2 of a single insulating strip corresponding to the reinforcing portion 22 of the isolation protective layer 2 in the edge area 12 is greater than the width W1 of a single insulating strip corresponding to the base portion 21 of the main area 11, i.e., W2 > W1. Through this design, on the one hand, the edge area 12 can be more fully covered by the isolation protective layer 2, effectively improving its protective effect on the passivation layer and other front functional layers in that area; on the other hand, the widened design of the reinforcing portion 22 in the edge area 12 allows it to distribute the stress over a larger area when subjected to external pressure during lamination, stacking, or other processes. This reduces the pressure per unit area and effectively mitigates stress-induced damage, thereby significantly reducing scratches and stress damage in the edge region 12, improving passivation in this area, reducing recombination, and ultimately improving battery conversion efficiency. On the other hand, since the light-receiving surface is covered by the isolation and protective layer 2, it will cause some optical loss. In this invention, only the width W2 of the single isolation strip corresponding to the reinforcing part 22 of the edge region 12 is widened, while the width W1 of the single isolation strip corresponding to the base part 21 of the main region 11 remains relatively small. This ensures that each area of ​​the light-receiving surface of the battery structure is effectively protected while reducing overall optical loss, so that the positive impact of reducing scratches and stress damage in the edge region 12 can dominate, thereby effectively improving the overall battery conversion efficiency.

[0064] Understandably, the battery body has a light-receiving surface and a back-lighting surface that are arranged opposite to each other. Specifically, including the substrate, a front functional layer can be set on the side of the substrate corresponding to the light-receiving surface. The front functional layer can be a front passivation layer, an anti-reflection layer, etc., but is not limited to these. An isolation and protective layer 2 is then set on the surface of the front functional layer. The material of the front passivation layer can be amorphous silicon or microcrystalline silicon, but is not limited to these. The material of the anti-reflection layer can be any one of silicon nitride, silicon oxynitride, and silicon oxide, but is not limited to these. On the side of the substrate corresponding to the back-lighting surface, a doped layer, a passivation layer, a metallized pattern layer (including gate lines), an anti-reflection layer, etc., can be set, but is not limited to these.

[0065] In practical applications, the embodiments of the present invention do not specifically limit the material and conductivity type of the substrate. For example, the substrate can be a silicon substrate, such as monocrystalline silicon, microcrystalline silicon, polycrystalline silicon, or amorphous silicon, or a germanium-silicon substrate, germanium substrate, or gallium arsenide substrate, but is not limited thereto, and its conductivity type can be N-type or P-type.

[0066] The isolation and protective layer 2 includes a base portion 21 located in the main region 11 and a reinforcing portion 22 located in the edge region 12. Specifically, the isolation and protective layer 2 has a base portion 21 corresponding to the defined main region 11 and a reinforcing portion 22 only corresponding to the defined edge region 12. In a first embodiment, the light-receiving surface only includes a first edge region 12A, and the first edge region 12A is only located on either side of the main region 11 in the first direction (first unit 221 or second unit 222). The isolation and protective layer 2 has a reinforcing portion 22 only in the first edge region 12A. In a second embodiment, the light-receiving surface only includes the first edge region 12A, and the first edge region 12A is respectively located on both sides of the main region 11 in the first direction (first unit 221 and second unit 222). The isolation and protective layer 2 has a reinforcing portion 22 only in the first edge region 12A. In a third embodiment, the light-receiving surface only includes a second edge region 12A. In the fourth embodiment, the light-receiving surface includes only the second edge region 12B, and the second edge region 12B is provided on both sides of the main region 11 in the second direction (third unit 223 or fourth unit 224). The isolation and protective layer 2 is provided with a reinforcement portion 22 only in the second edge region 12B. In the fifth embodiment, the light-receiving surface includes both the first edge region 12A and the second edge region 12B, and the first edge region 12A is provided with a reinforcement portion 22 only in the second edge region 12B. Domain 12A is located only on either side of the main region 11 in the first direction (first unit 221 or second unit 222), and the second edge region 12B is located only on either side of the main region 11 in the second direction (third unit 223 or fourth unit 224). The isolation and protection layer 2 has reinforcement portions 22 only in the aforementioned first edge region 12A and second edge region 12B. In the sixth specific embodiment, the light-receiving surface includes both the first edge region 12A and the second edge region 12B, and the first edge region 12A is located only on either side of the main region 11 in the first direction (first unit 221 or second unit 222), while the second edge region 12B is located on the second edge region 11 in the second direction. On both sides of the direction (third unit 223 and fourth unit 224), the isolation and protection layer 2 is provided with reinforcement parts 22 only in the first edge region 12A and the second edge region 12B; in the seventh specific embodiment, the light-receiving surface includes both the first edge region 12A and the second edge region 12B, and the first edge region 12A is respectively provided on both sides of the main region 11 in the first direction (first unit 221 and second unit 222), and the second edge region 12B is only provided on either side of the main region 11 in the second direction (third unit 223 or fourth unit 224), and the isolation and protection layer 2 is provided with reinforcement parts 22 only in the first edge region 12A and the second edge region 12B;Preferably, in the eighth embodiment, the light-receiving surface includes both a first edge region 12A and a second edge region 12B. The first edge region 12A is respectively located on both sides of the main region 11 in a first direction (first unit 221 and second unit 222), and the second edge region 12B is respectively located on both sides of the main region 11 in a second direction (third unit 223 and fourth unit 224). The isolation and protection layer 2 has reinforcement portions 22 only in the aforementioned first edge region 12A and second edge region 12B.

[0067] In some embodiments, see Figures 1 to 2 As shown, 1.17W1 < W2 ≤ 2.5W1, In the formula, W1 is the width of a single insulating strip in the base part 21 in the first direction; W2 is the width of a single insulating strip in the reinforcing part 22 in the first direction.

[0068] For example, W2 can be 1.17W1, 1.2W1, 1.3W1, 1.4W1, 1.5W1, 1.6W1, 1.7W1, 1.8W1, 1.9W1, 2W1, 2.1W1, 2.2W1, 2.3W1, 2.4W1 or 2.5, but is not limited thereto.

[0069] When W2 is too large relative to W1, it can easily cause the width W2 of a single insulating strip corresponding to the reinforcing part 22 in the edge region 12 to be too wide, thus increasing unnecessary optical loss. In the main region 11, in order to match the arrangement design of the reinforcing part 22, the spacing between two adjacent insulating strips of the substrate 21 can easily be too wide, affecting its protection effect on the front passivation layer and other front functional layers in this region, which is not conducive to improving the battery conversion efficiency.

[0070] When W2 is too small relative to W1, it is difficult to form a more effective differentiated design. The protective effect on the edge region 12 and the control of optical loss brought about by the differentiated design will be difficult to fully exert, which is not conducive to improving the battery conversion efficiency.

[0071] In this embodiment, preferably, 1.17W1 < W2 ≤ 2.5W1. Within this range, the protective effect of the isolation and protection layer 2 on the edge region 12 and the control of optical loss can be effectively balanced, so that it has both good protection effect and small optical loss, thereby further improving the battery conversion efficiency.

[0072] In some embodiments, see Figures 1 to 2 As shown, the width W1 of a single insulating strip in the substrate 21 in the first direction is 0.4mm to 0.6mm; and / or, In the reinforcement section 22, the width W2 of a single isolation strip in the first direction is 0.7mm to 1mm.

[0073] For example, W1 can be 0.4mm, 0.42mm, 0.45mm, 0.48mm, 0.5mm or 0.6mm, but is not limited thereto; W2 can be 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm, but is not limited thereto.

[0074] In some embodiments, see Figure 4 As shown, H2 > H1. In the formula, H1 is the height of a single insulating strip in the base part 21 in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcing part 22 in the thickness direction of the battery body.

[0075] In this embodiment, compared to the width W1 and height H1 of the single insulating strip corresponding to the base portion 21 in the main region 11, the width W2 and height H2 of the single insulating strip in the reinforcing portion 22 in the edge region 12 are increased simultaneously. On the one hand, compared to only increasing the width, this design with simultaneous increase in width and height has a higher ability to withstand and resist scratches and stress, and can achieve a better protection effect. Moreover, under the premise of the same protection effect, compared to the design with only increasing the width, this design with simultaneous increase in width and height can use a smaller increase in width, thereby reducing the obstruction of the light-receiving surface, which is conducive to further reducing optical loss and further improving battery conversion efficiency. On the other hand, compared to the design with only increasing the height, this design with simultaneous increase in width and height can achieve a better protection effect while effectively avoiding the problems of increased stress concentration risk and increased production difficulty that are easily caused by the design with only increasing the height, thereby further improving the reliability and mass production adaptability of the overall battery structure.

[0076] Understandable. Figure 4 In the battery body thickness direction, the transition of the insulating strip between the base part 21 and the reinforcing part 22 is a right-angle step-like transition. In some embodiments, a slope-like gradual transition can also be used, but it is not limited to this.

[0077] In some embodiments, see Figure 4 As shown, 1.4H1 < H2 ≤ 2.4H1, In the formula, H1 is the height of a single insulating strip in the base part 21 in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcing part 22 in the thickness direction of the battery body.

[0078] For example, H2 can be 1.4H1, 1.5H1, 1.6H1, 1.7H1, 1.8H1, 1.9H1, 2H1, 2.1H1, 2.2H1, 2.3H1 or 2.4H1, but is not limited thereto.

[0079] When H2 is too large relative to H1, it increases the risk of stress concentration in the edge region 12, thereby affecting the integrity of the front functional layer in this area, leading to a decrease in passivation effect, increased composite material, and increased molding difficulty of the isolation strip in this area. When H2 is too small relative to H1, its ability to withstand and resist scratches and stress is only slightly improved compared to simply increasing the width. In this invention, preferably, 1.4H1 < H2 ≤ 2.4H1. Within this range, it can better match the widening design of the single isolation strip in the reinforcing part 22 in the edge region 12, so that the reinforcing part 22 in the edge region 12 can obtain a higher ability to withstand and resist scratches and stress, while effectively avoiding problems such as stress concentration and increased production difficulty caused by excessive height.

[0080] Understandably, the cross-sectional profile of the isolation strip in the second direction can be a regular rectangle, trapezoid, semicircle, etc., or it can be linearly or non-linearly decreasing from the central axis position of the isolation strip in the first direction (which extends along the second direction) in the first direction away from the central axis position. When the various positions of the cross-sectional profile of the isolation strip in the second direction are not of equal height, H1 and H2 are based on the height of their highest points.

[0081] In some embodiments, see Figure 4 As shown, the height H1 of a single insulating strip in the base portion 21 along the thickness direction of the battery body is 3μm~5μm; and / or, In the reinforcement section 22, the height H2 of a single insulating strip in the thickness direction of the battery body is 4μm~7μm.

[0082] For example, H1 can be 3μm, 3.2μm, 3.5μm, 3.8μm, 4μm, 4.2μm, 4.5μm, 4.8μm or 5μm, but is not limited thereto; H2 can be 4μm, 4.2μm, 4.5μm, 4.8μm, 5μm, 5.2μm, 5.5μm, 5.8μm, 6μm, 6.2μm, 6.5μm, 6.8μm or 7μm, but is not limited thereto.

[0083] Preferably, H1 is 3μm~5μm and H2 is 4μm~7μm. Within this range, the reinforcing part 22 of the edge region 12 and the base part 21 of the main region 11 can both play a good protective role. At the same time, it effectively avoids problems such as stress concentration in the edge region 12 and increased production difficulty caused by excessive height.

[0084] In some embodiments, see Figures 1 to 2As shown, the second edge region 12B includes a third sub-region 123 and a fourth sub-region 124 respectively located on both sides of the main region 11 in the second direction. The reinforcing part 22 includes a third unit 223 located in the third sub-region 123 and a fourth unit 224 located in the fourth sub-region 124. 5%≤D3 / W≤25%, where D3 is the length of the third unit 223 in the second direction; W is the width of the battery body in the second direction; and / or, 5%≤D4 / W≤25%, where D4 is the length of the fourth unit 224 in the second direction; W is the width of the battery body in the second direction; and / or, 10%≤(D3+D4) / W≤50%, where D3 is the length of the third unit 223 in the second direction; D4 is the length of the fourth unit 224 in the second direction; and W is the width of the battery body in the second direction.

[0085] By controlling the length of the second edge region 12B (third unit 223, fourth unit 224) in the second direction, the proportion of the reinforcing part 22 relative to the battery body in the second direction can be controlled. This ensures that the coverage of its protective effect is sufficient to cover areas on the battery body that are easily scratched and suffer greater stress damage. It also further reduces the overall obstruction of the light-receiving surface by the isolation and protection layer 2, which helps to further reduce optical loss and thus further improve the battery conversion efficiency.

[0086] For example, D3 / W can be 5%, 6%, 7%, 8%, 9%, 10%, 12%, 15%, 18%, 20%, 22%, 24%, or 25%, but is not limited thereto; D4 / W can be 5%, 6%, 7%, 8%, 9%, 10%, 12%, 15%, 18%, 20%, 22%, 24%, or 25%, but is not limited thereto; (D3+D4) / W can be 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 35%, 40%, 45%, or 50%, but is not limited thereto.

[0087] In some embodiments, see Figure 2 As shown, the length D3 of the third unit 223 in the second direction is 0.5cm to 2.5cm; and / or, The length D4 of Unit 4 224 in the second direction is 0.5cm~2.5cm.

[0088] Preferably, D3 is 0.5cm~2.5cm and D4 is 0.5cm~2.5cm. Within this range, it can ensure that it can adapt to batteries of various sizes on the market. While ensuring that the coverage of its protective effect is sufficient to cover the areas of the battery body that are easily scratched and suffer greater stress damage, it further reduces the overall obstruction of the light-receiving surface by the isolation and protective layer 2, which is conducive to further reducing optical loss and thus further improving the battery conversion efficiency.

[0089] For example, D3 can be 0.5cm, 0.6cm, 0.7cm, 0.8cm, 1cm, 1.1cm, 1.2cm, 1.3cm, 1.4cm, 1.5cm, 1.6cm, 1.7cm, 1.8cm, 1.9cm, 2.2cm, or 2.5cm, but is not limited thereto; D4 can be 0.5cm, 0.6cm, 0.7cm, 0.8cm, 1cm, 1.1cm, 1.2cm, 1.3cm, 1.4cm, 1.5cm, 1.6cm, 1.7cm, 1.8cm, 1.9cm, 2.2cm, or 2.5cm, but is not limited thereto.

[0090] In some embodiments, see Figures 1 to 2 As shown, the first edge region 12A includes a first sub-region 121 and a second sub-region 122 respectively disposed on both sides of the main region 11 in a first direction. The reinforcing part 22 includes a first unit 221 located in the first sub-region 121 and a second unit 222 located in the second sub-region 122. 1.1%≤D1 / L≤2.2%, where D1 is the relative distance between the two insulating strips located at opposite ends in the first direction of the first unit 221, and L is the length of the battery body in the first direction; and / or, 1.1%≤D2 / L≤2.2%, where D2 is the relative distance between the two insulating strips located at opposite ends of each other in the first direction of the second unit 222, and L is the length of the battery body in the first direction; and / or, 2.2%≤(D1+D2) / L≤4.4%, where D1 is the relative distance between the two insulating strips at both ends of the first direction in the first unit 221, D2 is the relative distance between the two insulating strips at both ends of the first direction in the second unit 222, and L is the length of the battery body in the first direction.

[0091] By controlling the width of the first edge region 12A (first unit 221, second unit 222) in the first direction, the proportion of the reinforcing part 22 relative to the battery body in the first direction can be controlled. This ensures that the coverage of its protective effect is sufficient to cover areas on the battery body that are easily scratched and suffer greater stress damage. It also further reduces the overall obstruction of the light-receiving surface by the isolation and protective layer 2, which helps to further reduce optical loss and thus further improve the battery conversion efficiency.

[0092] For example, D1 / L can be 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2.2%, but is not limited thereto; D2 / L can be 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2.2%, but is not limited thereto; (D1+D2) / L can be 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, or 4.4%, but is not limited thereto.

[0093] In some embodiments, see Figures 1 to 2 As shown, the relative distance D1 between the two insulating strips located at both ends in the first direction of the first unit 221, on one side away from each other, is 2mm~4mm; and / or, The relative distance D2 between the two isolation strips located at both ends of the first direction in the second unit 222 is 2mm~4mm.

[0094] For example, D1 can be 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.6mm or 4mm, but is not limited thereto; D2 can be 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.6mm or 4mm, but is not limited thereto.

[0095] Preferably, D1 is 2mm~4mm and D2 is 2mm~4mm. Within this range, it can ensure that it can adapt to batteries of various sizes on the market. While ensuring that the coverage of its protective effect is sufficient to cover the areas on the battery body that are easily scratched and suffer greater stress damage, it further reduces the overall obstruction of the light-receiving surface by the isolation and protective layer 2, which helps to further reduce optical loss and thus further improve the battery conversion efficiency.

[0096] In some embodiments, the coverage area of ​​the isolation and protection layer 2 accounts for 31% to 50% of the total area, based on the area of ​​the light-receiving surface.

[0097] Understandably, the coverage area of ​​the isolation and protection layer 2 refers to the projected area of ​​the isolation and protection layer 2 in the thickness direction of the battery body.

[0098] By controlling the overall coverage area of ​​the protective isolation layer 2, while ensuring effective protection for all areas of the light-receiving surface of the battery structure, overall optical loss is reduced. This ensures that the positive impact of reducing scratches and stress damage in the edge area 12 outweighs the optical loss caused by the protective isolation layer 2 covering the light-receiving surface, thereby effectively improving the overall battery conversion efficiency. Simultaneously, it effectively avoids problems such as increased risk of battery warping and unnecessary material loss that can result from an excessively large protective isolation layer 2 coverage area.

[0099] For example, the coverage area of ​​the isolation and protection layer 2 can be 31%, 35%, 38%, 40%, 42%, 45%, 48% or 50%, but is not limited to this.

[0100] In some embodiments, see Figures 1 to 2 As shown, the first edge region 12A includes a first sub-region 121 and a second sub-region 122 respectively disposed on both sides of the main region 11 in a first direction. The reinforcing part 22 includes a first unit 221 located in the first sub-region 121 and a second unit 222 located in the second sub-region 122. 4.5%≤(S1+S2) / S0≤17%, In the formula, S1 is the coverage area of ​​the first unit 221; S2 is the coverage area of ​​the second unit 222; and S0 is the coverage area of ​​the base part 21.

[0101] For example, (S1+S2) / S0 can be 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16% or 17%, but is not limited thereto.

[0102] By controlling the overall coverage area ratio of the first edge region 12A (first unit 221, second unit 222), it is possible to ensure that the coverage of its protective effect is sufficient to cover the areas on the battery body that are easily scratched and suffer greater stress damage, and to further reduce the overall obstruction of the light-receiving surface by the isolation and protection layer 2, which is conducive to further reducing optical loss and thus further improving the battery conversion efficiency.

[0103] In some embodiments, see Figures 1 to 2 As shown, the second edge region 12B includes a third sub-region 123 and a fourth sub-region 124 respectively located on both sides of the main region 11 in the second direction. The reinforcing part 22 includes a third unit 223 located in the third sub-region 123 and a fourth unit 224 located in the fourth sub-region 124. 13%≤(S3+S4) / S0≤250%, In the formula, S3 is the coverage area of ​​the third unit 223; S4 is the coverage area of ​​the fourth unit 224; and S0 is the coverage area of ​​the base part 21.

[0104] For example, (S3+S4) / S0 can be 13%, 20%, 30%, 50%, 80%, 100%, 120%, 150%, 180%, 200%, 220%, 230%, or 250%, but is not limited thereto.

[0105] By controlling the overall coverage area ratio of the second edge region 12B (third unit 223, fourth unit 224), it is possible to ensure that the coverage of its protective effect is sufficient to cover the areas on the battery body that are easily scratched and suffer greater stress damage, while also further reducing the overall obstruction of the light-receiving surface by the isolation and protection layer 2, which is conducive to further reducing optical loss and thus further improving the battery conversion efficiency.

[0106] In some embodiments, see Figures 1 to 3 As shown, on the same side of the battery body in the first direction, the distance between the outer edge of the light-receiving surface extending along the second direction and the reinforcing portion 22 on that side is d1, where d1 < 0.5 mm; and / or, On the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the reinforcing part 22 on the same side is d2, where d2 < 0.5 mm.

[0107] In the prior art, in order to reduce the production precision requirements, the distance between the graphic edge of the insulating adhesive layer and the outer edge of the adjacent battery edge is usually large, generally greater than 1mm. This also leads to more scratches and greater stress loss on the battery edge. In this invention, d1 < 0.5mm and d2 < 0.5mm are made so that the reinforcing part 22 is closer to the outer edge of the corresponding side of the battery body, or even extends to the outer edge of the corresponding side of the battery body, effectively protecting the battery edge, improving its protective effect, and further improving the battery conversion efficiency.

[0108] In some embodiments, see Figures 1 to 3 As shown, on the same side of the battery body in the first direction, the distance d1 between the outer edge of the light-receiving surface extending along the second direction and the reinforcing portion 22 on that side is 0.05mm ≤ d1 < 0.5mm; and / or, On the same side of the battery body in the second direction, the distance d2 between the outer edge of the light-receiving surface extending along the first direction and the reinforcing part 22 on the same side is 0.05mm≤d2<0.5mm.

[0109] In some embodiments, the values ​​of d1 and d2 can be in the range of 0mm≤d1<0.5mm and 0.05mm≤d2<0.5mm. However, when 0mm≤d1<0.05mm and 0mm≤d2<0.05mm, although a good protective effect can be achieved, the production precision requirements are too high, and the spraying or printing area of ​​the isolation protective layer 2 may exceed the battery body due to process errors. Therefore, preferably, 0.05mm≤d1<0.5mm and 0.05mm≤d2<0.5mm can ensure that the isolation protective layer 2 can obtain a protective effect that is almost equivalent to the value range of 0mm≤d1<0.05mm and 0mm≤d2<0.05mm, while reducing the production precision requirements, effectively balancing the protective effect and the production precision requirements, and achieving better overall benefits.

[0110] For example, d1 can be 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.4mm, 0.42mm, 0.45mm, 0.48mm or 0.5mm, but is not limited thereto.

[0111] For example, d2 can be 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.32mm, 0.35mm, 0.38mm, 0.4mm, 0.42mm, 0.45mm, 0.48mm or 0.5mm, but is not limited thereto.

[0112] In some embodiments, see Figure 2 As shown, in the reinforcing part 22, the spacing W4 between adjacent isolation strips in the first direction is 0.5mm to 2mm.

[0113] By controlling the spacing W4 between adjacent insulating strips in the first direction in the reinforcing section 22, the insulating strips in the reinforcing section 22 are prevented from being too dense or too sparse, thereby avoiding unnecessary optical loss due to excessively dense arrangement of the insulating strips in the reinforcing section 22, or affecting its protective effect due to excessively sparse arrangement of the insulating strips in the reinforcing section 22.

[0114] For example, W4 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 19mm or 2mm, but is not limited thereto.

[0115] In some embodiments, the light transmittance of the isolation and protective layer 2 is greater than or equal to 92%. By selecting an isolation and protective layer 2 with high light transmittance, the transmittance of light into the battery body is increased, optical loss is reduced, and the overall battery efficiency is effectively improved.

[0116] In some embodiments, preferably, the isolation and protection layer 2 is made of an insulating material, especially when there is a partially stacked structure between adjacent cells in the battery assembly, the insulating isolation and protection layer 2 can prevent short circuits.

[0117] In some embodiments, the material of the isolation and protective layer 2 may be an isolation adhesive, EVA, POE, EPE, PVB, PDMS, etc., wherein the isolation adhesive is a film layer containing film-forming resin, diluent, additives and other components mixed and cured, and the curing process may be light curing or heat curing, and the isolation adhesive may be a self-made product or a commercially available product.

[0118] In some embodiments, the light-receiving surface may further include a first identification area, in which no isolation strip is provided; correspondingly, the first identification area may be a blank area, which may serve as a membrane color sorting and detection area.

[0119] In some embodiments, the light-receiving surface may further include a second identification area, in which no insulating adhesive strip is provided, and correspondingly, an identification code for battery information is provided in the second identification area. The identification code may be a QR code, barcode, etc., but is not limited thereto. The battery information may be battery electrical parameter information, processing procedure information, etc., but is not limited thereto.

[0120] In some embodiments, see Figures 5 to 6 As shown, the backlight surface includes a plurality of fine grids 3 arranged along a second direction, each fine grid 3 extending along a first direction. The fine grids 3 include first polarity fine grids 3 and second polarity fine grids 3 arranged alternately along the second direction with opposite polarities.

[0121] That is, the extending direction of the insulating strip forms an angle with the extending direction of the fine grid 3. This angle is consistent with the angle formed by the intersection of the first and second directions, and is usually a right angle, meaning that the two are perpendicular to each other. Therefore, in the later stages of battery manufacturing (such as testing, sorting, and packaging), the battery is conveyed on the conveying device with the insulating protective layer 2 facing downwards (i.e., the surface of the insulating protective layer 2 faces the conveying device). Typically, the rotation axis of the conveying rollers is set along the extending direction of the fine grid 3, and the conveying direction is perpendicular to the extending direction of the fine grid 3. Therefore, if the extension direction of the insulating strip is parallel to the extension direction of the fine grid 3, there may be direct frictional contact between the front functional layer corresponding to the gap between the conveyor roller and the adjacent insulating strip, which could scratch the front functional layer. However, when the extension direction of the insulating strip is perpendicular to the extension direction of the fine grid 3, the extension direction of the insulating strip is also perpendicular to the rotation direction of the conveyor roller. This ensures that during the conveying process, the battery can always contact the conveyor roller through the insulating protective layer 2, avoiding direct frictional contact between the conveyor roller and the front functional layer of the light-receiving surface, and reducing the risk of scratching the front functional layer. On the other hand, this setting also ensures that when the batteries are stacked, the insulating strip will not get stuck in the gap between the adjacent fine grids 3, which would weaken or even cause its protective effect to fail in such a scenario.

[0122] In some embodiments, see Figures 5 to 6 As shown, in the thickness direction of the battery body, the overlap area between the orthographic projection of a single insulating strip in the substrate 21 and the orthographic projection of a single fine grid 3 is at least 0.01 mm. 2 .

[0123] In scenarios such as lamination and stacked storage, between two adjacent cells that are at least partially stacked, the contact area between the insulating strip of one cell and the fine grid 3 of the other cell consists of multiple discrete small regions. The area of ​​each small region basically corresponds to the area of ​​the overlapping region. By controlling the overlapping region, the risk of local stress concentration due to the small area of ​​the small region is avoided.

[0124] In some embodiments, see Figure 2 , Figure 5 and Figure 6 As shown, 0.1W1 < W3 ≤ 0.75W1, In the formula, W1 is the width of a single insulating strip in the substrate 21 in the first direction; W3 is the width of a single fine grid 3 in the second direction.

[0125] Ensure that the fine gate 3 has sufficient width to avoid the risk of local stress concentration due to the small area of ​​the aforementioned small region in scenarios such as stacking and storage, and ensure that the fine gate 3 has sufficient rigidity.

[0126] For example, W3 can be 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, 0.6W1, 0.7W1, or 0.75W1, but is not limited thereto.

[0127] In some embodiments, see Figures 10 to 11 As shown, the isolation and protective layer 2 also includes at least one longitudinal adhesive strip 23, which extends along the first direction and connects at least two isolation adhesive strips.

[0128] Understandably, the longitudinal adhesive strip 23 can be an integral structure, for example, extending from one end of the battery body in a first direction to the other end, or it can be an intermittent design, for example, having a number of segments spaced apart along the first direction, with each segment located between adjacent adhesive strips.

[0129] The protective effect is further enhanced by the cooperation between the mutually angled isolation strips and the longitudinal strip 23.

[0130] The longitudinal adhesive strip 23 can be provided on one side of the second direction of the battery body, or on both sides of the second direction of the battery body. For example, in a whole sheet containing two preset segmented areas, each preset segmented area includes the above-mentioned solar cell structure. The longitudinal adhesive strip 23 is provided on both sides of the second direction of the whole sheet. In this case, the longitudinal adhesive strip 23 is provided on the side of the second direction of each solar cell structure that is far away from each other, so as to protect the whole sheet during the preparation and transportation process before it is divided into segments. Alternatively, the longitudinal adhesive strip 23 is provided on both sides of the second direction of each solar cell structure in the whole sheet. After division, the longitudinal adhesive strip 23 is provided on both sides of the second direction of each segment, which can improve the protection effect of the edge of each segment.

[0131] In some embodiments, there is an overlap area between the longitudinal adhesive strip 23 and the isolation adhesive strip to which it is connected; or... The longitudinal rubber strip 23 and the isolation rubber strip connected to it are integrally formed.

[0132] Understandably, when there is an overlapping area between the longitudinal adhesive strip 23 and the isolation adhesive strip it is connected to, it can be that, during preparation, the isolation adhesive strip is printed first and then the longitudinal adhesive strip 23 is printed. In this case, the longitudinal adhesive strip 23 at least partially covers the isolation adhesive strip. Alternatively, during preparation, the longitudinal adhesive strip 23 is printed first and then the isolation adhesive strip is printed. In this case, the longitudinal adhesive strip 23 is at least partially covered by the isolation adhesive strip.

[0133] The longitudinal adhesive strip 23 and its connected isolation adhesive strip are integrally formed, meaning that the longitudinal adhesive strip 23 and the isolation adhesive strip are printed and cured simultaneously to form a single unit. In this case, there is no overlapping area between the longitudinal adhesive strip 23 and its connected isolation adhesive strip. Preferably, the longitudinal adhesive strip 23 and its connected isolation adhesive strip are integrally formed to simplify the process.

[0134] In some embodiments, see Figures 10 to 11 As shown, a longitudinal adhesive strip 23 is provided in the edge region 12 and on the same side in the second direction of the battery body. The longitudinal adhesive strip 23 extends at least partially from the second edge region 12B to the first edge region 12A and is connected to the reinforcing part 22 located in the first edge region 12A and the reinforcing part 22 located in the second edge region 12B, respectively.

[0135] By placing the longitudinal adhesive strip 23 on the edge area 12, the protective effect on the edge area 12 is further enhanced.

[0136] In some embodiments, see Figures 10 to 11 As shown, the junction between the longitudinal adhesive strip 23 and the reinforcing portion 22 located in the first edge region 12A at least partially covers the corner of the battery body, which can effectively protect the corner of the battery body.

[0137] In some embodiments, see Figures 10 to 11 As shown, on the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the longitudinal adhesive strip 23 on the side where it is located is d3, where d3 < 0.5 mm.

[0138] The longitudinal adhesive strip 23 can be located at any position in the main area or at any position in the edge area 12. Preferably, the longitudinal adhesive strip 23 is located in the edge area 12. More preferably, in the second direction, the distance d3 between the outer edge of the light-receiving surface extending along the first direction and the longitudinal adhesive strip 23 on its side is less than 0.5mm, so that the longitudinal adhesive strip 23 is closer to the outer edge of the corresponding side of the battery body, or even extends to the outer edge of the corresponding side of the battery body, effectively protecting the battery edge, improving its protection effect, and further improving the battery conversion efficiency.

[0139] In one specific embodiment, 0mm≤d3<0.05mm, that is, the longitudinal adhesive strip 23 extends to the outer edge of the corresponding side of the battery body or is very close to the outer edge; in another specific embodiment, the value of d3 can be 0mm≤d3<0.5mm.

[0140] When 0mm≤d3<0.05mm, although a good protective effect can be achieved, the production precision requirements are too high. It is easy for the spraying or printing range of the isolation and protective layer 2 to exceed the battery body due to process errors. Therefore, when 0.05mm≤d3<0.5mm, the production precision requirements can be reduced while ensuring that the isolation and protective layer 2 can achieve a protective effect that is almost equivalent to the value range of 0mm≤d3<0.05mm. This effectively balances the protective effect and the production precision requirements, resulting in better overall benefits.

[0141] In some embodiments, see Figure 7 and Figure 8 As shown, the backlight surface includes a metallized pattern layer, and the light-receiving surface is provided with an identification mark 4 for identifying the metallized pattern layer. That is, one identification mark 4 corresponds to one type of metallized pattern layer. Specifically, when different preset segmentation areas 10 are set on a whole piece, the patterns of the metallized pattern layers at the corresponding positions of different preset segmentation areas 10 may be different, and the metallized pattern layers corresponding to the subsequent segments formed by cutting are also different. By setting the identification mark 4 on the light-receiving surface of each preset segmentation area 10, the battery segments corresponding to the required metallized pattern layer can be quickly identified and picked up without flipping during the production process, making production more convenient and faster.

[0142] The metallized pattern layer includes at least gate lines, and the gate lines include at least fine gates 3. In some embodiments, the gate lines include fine gates 3 and main gates. In some embodiments, the metallized pattern layer also includes pad points.

[0143] The identification mark 4 can be set at any position on the light-receiving surface. Preferably, the identification mark 4 can be set in the edge area 12 of the light-receiving surface, so that even if multiple battery segments are stacked on each other, the identification mark 4 can be exposed by only slightly offsetting them locally.

[0144] In some embodiments, the identification mark 4 includes any one or more combinations of text marks, color marks, and graphic marks.

[0145] For example, the text markings can be upright or inverted letters, Chinese characters, numbers, symbols, etc., but are not limited to these. Upright means that, from the perspective of the first direction (from the second unit 222 to the first unit 221), the characters of the text markings are oriented in the same direction as the viewing direction, meaning the observer can read them normally; inverted means the opposite. For example, Figure 8 The light-receiving surfaces of two preset segmented regions 10 on the same whole piece are shown to use the letters A and B as identification marks 4 to identify the metallized patterned layers with different shapes corresponding to the preset segmented regions 10.

[0146] For example, graphic markers can be any of textures, geometric shapes, or custom patterns.

[0147] Second, see Figure 1 As shown, the present invention also discloses a solar cell slab, including the above-described solar cell structure.

[0148] Understandably, in the first embodiment, a first edge region 12A and a reinforcing portion 22 corresponding to one or both edges of the battery cell in the first direction are provided; in the second embodiment, a second edge region 12B and a reinforcing portion 22 corresponding to one or both edges of the battery cell in the second direction are provided; in the third embodiment, a first edge region 12A and a reinforcing portion 22 corresponding to one or both edges of the battery cell in the first direction are provided, and a second edge region 12B and a reinforcing portion 22 corresponding to one or both edges of the battery cell in the second direction are provided.

[0149] Third, see Figure 9 As shown, the present invention also discloses a complete solar cell, including the solar cell structure described above.

[0150] Understandably, in the first embodiment, a first edge region 12A and a reinforcing portion 22 located within the first edge region 12A are provided on either side or both sides of the entire battery cell in the first direction; in the second embodiment, a second edge region 12B and a reinforcing portion 22 located within the second edge region 12B are provided on either side or both sides of the entire battery cell in the second direction; in the third embodiment, a first edge region 12A and a reinforcing portion 22 located within the first edge region 12A are provided on either side or both sides of the entire battery cell in the first direction, and a second edge region 12B and a reinforcing portion 22 located within the second edge region 12B are provided on either side or both sides of the entire battery cell in the second direction.

[0151] Fourth, see Figure 8 As shown, the present invention also discloses a complete solar cell, including preset segmented regions 10 arranged in an array, with preset dividing lines M between adjacent preset segmented regions 10, and each preset segmented region 10 including the above-mentioned solar cell structure.

[0152] Understandably, when a battery cell is cut along a preset dividing line M, each preset segmented region 10 is separated into independent N segments (N is a positive integer greater than or equal to 2), such as two segments, three segments, four segments, etc., but not limited to these. In the first embodiment, each preset segmented region 10 has a first edge region 12A and a corresponding reinforcing portion 22 located within the first edge region 12A on either side or both sides of its first direction. In the second embodiment, each preset segmented region 10 has a second edge region 12B and a corresponding reinforcing portion 22 located within the second edge region 12B on either side or both sides of its second direction. In the third embodiment, each preset segmented region 10 has a first edge region 12A and a corresponding reinforcing portion 22 located within the first edge region 12A on either side or both sides of its first direction, and a second edge region 12B and a corresponding reinforcing portion 22 located within the second edge region 12B on either side or both sides of its second direction.

[0153] Fifth, the present invention provides a solar cell module, including the aforementioned solar cell structure; or, This includes one type of solar cell slab segmentation as described above; or, This includes the aforementioned type of complete solar cell.

[0154] Sixth, see Figures 1 to 2 and Figure 6 As shown, the present invention also discloses a solar cell module, including a first cell and a second cell arranged adjacent to each other along a second direction, wherein both the first cell and the second cell include the above-described solar cell structure; In the battery structure, on the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the second edge region 12B on that side is called the second distance d2. The first and second battery cells are stacked on their adjacent sides to form a stacked region 13. The width L1 of the stacked region 13 in the second direction is greater than the second spacing d2.

[0155] By making the width L1 of the stacked region 13 in the second direction greater than the second spacing d2, it is ensured that the reinforcement 22 can play a protective role in the stacked region 13, and prevent the front functional layer of the stacked region 13 from being scratched by the fine grid 3.

[0156] In some embodiments, see Figures 1 to 2 and Figure 6As shown, in the battery structure, the second edge region 12B includes a third sub-region 123 and a fourth sub-region 124 respectively located on both sides of the main region 11 in the second direction. The reinforcing part 22 includes a third unit 223 located in the third sub-region 123 and a fourth unit 224 located in the fourth sub-region 124. The orthographic projection of the third unit 223 corresponding to the first battery cell in the thickness direction of the first battery cell at least partially overlaps with the stacked region 13. 6.25L1≤D3+d2≤42.5L1, In the formula, D3 is the length of the third unit 223 in the second direction; d2 is the second spacing; and L1 is the width of the stacked region 13 in the second direction.

[0157] For example, D3+d2 can be 6.25L1, 10L1, 12L1, 15L1, 20L1, 22L1, 25L1, 28L1, 30L1, 32L1, 35L1, 38L1, 40L1 or 42.5L1, but is not limited thereto.

[0158] By using the above-mentioned preferred range, it is ensured that the reinforcement 22 can play a protective role in the stacked region 13, preventing the front functional layer of the stacked region 13 from being scratched by the fine grid 3. At the same time, it is also ensured that unnecessary optical loss is avoided due to the excessive extension length of the reinforcement 22 in the second direction.

[0159] Sixth, the present invention also discloses a photovoltaic system, including the aforementioned solar cell module.

[0160] Example 1 This invention discloses a solar cell structure, comprising: The battery body includes a light-receiving surface and a backlight surface arranged opposite to each other. The light-receiving surface includes a main area and an edge area. The edge area includes a first edge area and a second edge area. The first edge area is located on both sides of the main area in a first direction, and the second edge area is located on both sides of the main area in a second direction. The first direction and the second direction are arranged to intersect each other. An isolation and protective layer, disposed in a main area and an edge area, includes a plurality of isolation strips arranged along a first direction, each isolation strip extending along a second direction. The isolation and protective layer includes a base portion located in the main area and a reinforcing portion located in the edge area. W2 > W1, In the formula, W1 is the width of a single insulating strip in the base part in the first direction; W2 is the width of a single insulating strip in the reinforcement part in the first direction.

[0161] In this embodiment, W2 = 1.75W1. In the formula, W1 is the width of a single insulating strip in the base part in the first direction; W2 is the width of a single insulating strip in the reinforcement part in the first direction.

[0162] In this embodiment, the width W1 of a single insulating strip in the substrate is 0.4 mm in the first direction; the width W2 of a single insulating strip in the reinforcing part is 0.7 mm in the first direction.

[0163] In this embodiment, H2 = H1. In the formula, H1 is the height of a single insulating strip in the base part in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcement part in the thickness direction of the battery body.

[0164] In this embodiment, the height H1 of a single insulating strip in the base part in the thickness direction of the battery body is 5μm; The height H2 of a single insulating strip in the reinforced section in the thickness direction of the battery body is 5μm.

[0165] In this embodiment, the length D3 of the third unit in the second direction is 1 cm; The length D4 of the fourth unit in the second direction is 1 cm.

[0166] In this embodiment, the area of ​​the light-receiving surface is taken as the total area, and the coverage area of ​​the isolation and protection layer accounts for 31.0% of the total area.

[0167] In this embodiment, on the same side of the battery body in the first direction, the distance between the outer edge of the light-receiving surface extending along the second direction and the reinforcing part on the same side is d1, where d1 < 0.5 mm. On the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the reinforcing part on the same side is d2, where d2 < 0.5 mm.

[0168] In this embodiment, the backlight surface includes a plurality of fine grids arranged along the second direction, and each fine grid extends along the first direction.

[0169] This embodiment also discloses a solar cell slicing method, including the solar cell structure described above.

[0170] Example 2 The difference between this embodiment and Embodiment 1 is that in this embodiment, H2 > H1, specifically, 1.4H1 = H2. In the formula, H1 is the height of a single insulating strip in the base part in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcement part in the thickness direction of the battery body.

[0171] In this embodiment, the height H1 of a single insulating strip in the base part in the thickness direction of the battery body is 5μm; The height H2 of a single insulating strip in the reinforced section in the thickness direction of the battery body is 7μm.

[0172] Example 3 The difference between this embodiment and Embodiment 1 is that in this embodiment, W2 = 2.5W1. In the formula, W1 is the width of a single insulating strip in the base part in the first direction; W2 is the width of a single insulating strip in the reinforcement part in the first direction.

[0173] In this embodiment, the width W1 of a single insulating strip in the substrate is 0.4 mm in the first direction; the width W2 of a single insulating strip in the reinforcing part is 1 mm in the first direction.

[0174] In this embodiment, H2 > H1, specifically, 1.4H1 = H2. In the formula, H1 is the height of a single insulating strip in the base part in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcement part in the thickness direction of the battery body.

[0175] In this embodiment, the height H1 of a single insulating strip in the base part in the thickness direction of the battery body is 5μm; The height H2 of a single insulating strip in the reinforced section in the thickness direction of the battery body is 7μm.

[0176] In this embodiment, the length D3 of the third unit in the second direction is 1.5cm; The length D4 of the fourth unit in the second direction is 1.5 cm.

[0177] In this embodiment, the area of ​​the light-receiving surface is taken as the total area, and the coverage area of ​​the isolation and protection layer accounts for 39.6% of the total area.

[0178] Comparative Example 1 The difference between this comparative example and Example 1 is that in this comparative example, the width of a single isolation strip in the first direction is the same in both the main area and the edge area of ​​the isolation protective layer. That is, in both areas, the width of a single isolation strip in the first direction is 0.4 mm.

[0179] In this embodiment, the height of a single insulating strip in the main area and the edge area of ​​the isolation and protection layer is the same in the direction of the thickness of the battery body. That is, in both areas, the height of a single insulating strip in the direction of the thickness of the battery body is 5μm.

[0180] Scratch resistance and battery conversion efficiency tests: 1. Take 1000 pieces of each of the battery cells prepared in Examples 1 to 3 and Comparative Example 1, and test their scratch resistance and battery conversion efficiency. The scratch resistance is characterized by the scratch ratio.

[0181] The severity of scratches is categorized as follows: Appearance spot check: (1) Shallow scratches that do not penetrate the blue film layer: 1 scratch with a length ≤25mm and a width ≤0.4mm; or 3 scratches with a length ≤10mm and a width ≤0.3mm. (2) Deep scratches penetrating the blue film layer: length L < 5 mm, ≤ 1; or length ≤ 2 mm, width ≤ 0.1 mm, ≤ 2.

[0182] EL equipment full inspection: (1) Severe scratches: gray value > 60%, length L ≤ 3cm, width ≤ 2mm, number N ≤ 1; (2) Minor scratches: gray value ≤ 60%, length L ≤ 6cm, width ≤ 2mm, number N ≤ 3.

[0183] If any one of the above four conditions of appearance sampling (1) and (2) and EL equipment testing (1) and (2) is met, the piece is judged as a scratch defective product; otherwise, it is a scratch-resistant good product. The proportion of scratch defective products in each experimental group is calculated as the scratch ratio.

[0184] 2. The test results are shown below:

[0185] Experimental results show that, using the release liner of Comparative Example 1, observations... Figures 14 to 16 As shown, its surface has multiple obvious scratches, indicating poor protective effect of the isolation adhesive layer and affecting the passivation effect; while the isolation protective layer of Embodiment 1 of the present invention, see Figure 12 and Figure 13 As shown, its surface is intact with no obvious scratches, and the protective layer provides excellent protection.

[0186] In the description of this specification, references to terms such as "some embodiments," "exemplary," "example," or "for example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0187] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A solar cell structure, characterized in that, include: The battery body includes a light-receiving surface and a backlight surface arranged opposite to each other. The light-receiving surface includes a main area and an edge area. The edge area includes a first edge area and / or a second edge area. The first edge area is located on at least one side of the main area in a first direction, and the second edge area is located on at least one side of the main area in a second direction. The first direction and the second direction are arranged to intersect each other. An isolation and protective layer, disposed in the main region and the edge region, includes a plurality of isolation strips arranged along the first direction, and each isolation strip extends along the second direction. The isolation and protective layer includes a base portion located in the main region and a reinforcing portion located in the edge region. W2 > W1, In the formula, W1 is the width of a single insulating strip in the base portion in the first direction; W2 is the width of a single insulating strip in the reinforcing portion in the first direction.

2. The solar cell structure according to claim 1, characterized in that, 1.17W1 < W2 ≤ 2.5W1 In the formula, W1 is the width of a single insulating strip in the base portion in the first direction; W2 is the width of a single insulating strip in the reinforcing portion in the first direction.

3. A solar cell structure according to claim 1, characterized in that, The width W1 of a single insulating strip in the substrate portion in the first direction is 0.4mm to 0.6mm; and / or, The width W2 of a single insulating strip in the reinforced section in the first direction is 0.7mm to 1mm.

4. A solar cell structure according to claim 1, characterized in that, H2 > H1, In the formula, H1 is the height of a single insulating strip in the base portion in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcing portion in the thickness direction of the battery body.

5. A solar cell structure according to claim 4, characterized in that, 1.4H1<H2≤2.4H1, In the formula, H1 is the height of a single insulating strip in the base portion in the thickness direction of the battery body; H2 is the height of a single insulating strip in the reinforcing portion in the thickness direction of the battery body.

6. A solar cell structure according to claim 4, characterized in that, The height H1 of a single insulating strip in the base portion in the thickness direction of the battery body is 3μm~5μm; and / or The height H2 of a single insulating strip in the reinforced section in the thickness direction of the battery body is 4μm~7μm.

7. A solar cell structure according to claim 1, characterized in that, The second edge region includes a third sub-region and a fourth sub-region respectively located on both sides of the main region in a second direction. The reinforcing part includes a third unit located in the third sub-region and a fourth unit located in the fourth sub-region. 5%≤D3 / W≤25%, where D3 is the length of the third unit in the second direction; W is the width of the battery body in the second direction; and / or, 5%≤D4 / W≤25%, where D4 is the length of the fourth unit in the second direction; W is the width of the battery body in the second direction; and / or, 10%≤(D3+D4) / W≤50%, where D3 is the length of the third unit in the second direction; D4 is the length of the fourth unit in the second direction; and W is the width of the battery body in the second direction.

8. A solar cell structure according to claim 7, characterized in that, The length D3 of the third unit in the second direction is 0.5cm to 2.5cm; and / or, The length D4 of the fourth unit in the second direction is 0.5cm to 2.5cm.

9. A solar cell structure according to claim 1, characterized in that, The first edge region includes a first sub-region and a second sub-region respectively located on both sides of the main region in a first direction. The reinforcing part includes a first unit located in the first sub-region and a second unit located in the second sub-region. 1.1%≤D1 / L≤2.2%, where D1 is the relative distance between the two insulating strips located at opposite ends in the first direction of the first unit, and L is the length of the battery body in the first direction; and / or, 1.1%≤D2 / L≤2.2%, where D2 is the relative distance between the two insulating strips located at opposite ends of each other in the first direction in the second unit, and L is the length of the battery body in the first direction; and / or, 2.2%≤(D1+D2) / L≤4.4%, where D1 is the relative distance between the two insulating strips located at both ends of the first direction in the first unit and moving away from each other to one side, D2 is the relative distance between the two insulating strips located at both ends of the first direction in the second unit and moving away from each other to one side, and L is the length of the battery body in the first direction.

10. A solar cell structure according to claim 9, characterized in that, The relative distance D1 between the two insulating strips located at both ends in the first direction of the first unit, away from each other on one side, is 2mm~4mm; and / or, The relative distance D2 between the two insulating strips located at both ends of the first direction in the second unit is 2mm~4mm.

11. A solar cell structure according to claim 1, characterized in that, Based on the area of ​​the light-receiving surface as the total area, the coverage area of ​​the isolation and protection layer accounts for 31% to 50% of the total area.

12. A solar cell structure according to claim 1, characterized in that, The first edge region includes a first sub-region and a second sub-region respectively located on both sides of the main region in a first direction. The reinforcing part includes a first unit located in the first sub-region and a second unit located in the second sub-region. 4.5%≤(S1+S2) / S0≤17%, In the formula, S1 is the coverage area of ​​the first unit; S2 is the coverage area of ​​the second unit; and S0 is the coverage area of ​​the base portion.

13. A solar cell structure according to claim 1, characterized in that, The second edge region includes a third sub-region and a fourth sub-region respectively located on both sides of the main region in a second direction. The reinforcing part includes a third unit located in the third sub-region and a fourth unit located in the fourth sub-region. 13%≤(S3+S4) / S0≤250%, In the formula, S3 is the coverage area of ​​the third unit; S4 is the coverage area of ​​the fourth unit; and S0 is the coverage area of ​​the base portion.

14. A solar cell structure according to claim 1, characterized in that, On the same side of the battery body in the first direction, the distance between the outer edge of the light-receiving surface extending along the second direction and the reinforcing portion on that side is d1, where d1 < 0.5 mm; and / or, On the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the reinforcing part on the same side is d2, where d2 < 0.5 mm.

15. A solar cell structure according to claim 14, characterized in that, On the same side of the battery body in the first direction, the distance d1 between the outer edge of the light-receiving surface extending along the second direction and the reinforcing portion on that side is 0.05mm ≤ d1 < 0.5mm; and / or, On the same side of the battery body in the second direction, the distance d2 between the outer edge of the light-receiving surface extending along the first direction and the reinforcing part on the same side is 0.05mm≤d2<0.5mm.

16. A solar cell structure according to claim 1, characterized in that, In the reinforced section, the spacing between adjacent insulating strips in the first direction is 0.5mm to 2mm.

17. A solar cell structure according to claim 1, characterized in that, The light transmittance of the isolation and protective layer is greater than or equal to 92%; and / or, The isolation and protective layer is made of insulating material.

18. A solar cell structure according to claim 1, characterized in that, The backlight surface includes a plurality of fine grids arranged along the second direction, and each fine grid extends along the first direction.

19. A solar cell structure according to claim 18, characterized in that, In the thickness direction of the battery body, the overlap area between the orthographic projection of a single insulating strip and the orthographic projection of a single fine grid in the substrate is at least 0.01 mm. 2 .

20. A solar cell structure according to claim 18, characterized in that, 0.1W1 < W3 ≤ 0.75W1 In the formula, W1 is the width of a single insulating strip in the substrate in the first direction; W3 is the width of a single fine grid in the second direction.

21. A solar cell structure according to claim 1, characterized in that, The isolation and protective layer further includes at least one longitudinal adhesive strip, which extends along the first direction and connects at least two isolation adhesive strips.

22. A solar cell structure according to claim 21, characterized in that, There is an overlapping area between the longitudinal adhesive strip and the isolation adhesive strip to which it is connected; or... The longitudinal adhesive strip and the isolation adhesive strip connected to it are integrally formed.

23. A solar cell structure according to claim 21, characterized in that, The longitudinal adhesive strip is disposed in the edge region and on the same side of the battery body in the second direction, the longitudinal adhesive strip extends at least partially from the second edge region to the first edge region and is connected to the reinforcing portion located in the first edge region and the reinforcing portion located in the second edge region, respectively.

24. A solar cell structure according to claim 23, characterized in that, The junction between the longitudinal adhesive strip and the reinforcing portion located in the first edge region at least partially covers the corner of the battery body.

25. A solar cell structure according to claim 21, characterized in that, On the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the longitudinal adhesive strip on its side is d3, where d3 < 0.5 mm.

26. A solar cell structure according to claim 1, characterized in that, The backlight surface includes a metallized pattern layer, and the light-receiving surface is provided with identification marks for identifying the metallized pattern layer.

27. A solar cell structure according to claim 26, characterized in that, The identification markers include any one or more combinations of text markers, color markers, and graphic markers.

28. A method for segmenting solar cells, characterized in that, Includes a solar cell structure according to any one of claims 1 to 27.

29. A single solar cell, characterized in that, Includes a solar cell structure according to any one of claims 1 to 27.

30. A single solar cell, characterized in that, It includes preset segmented regions arranged in an array, with preset dividing lines between adjacent preset segmented regions, and each preset segmented region includes a solar cell structure according to any one of claims 1 to 27.

31. A solar cell module, characterized in that, Includes a solar cell structure according to any one of claims 1 to 27; or, Including a solar cell slab segmentation method according to claim 28; or, Includes a complete solar cell as described in claim 29 or 30.

32. A solar cell module, characterized in that, It includes a first solar cell and a second solar cell arranged adjacent to each other along the second direction, wherein both the first solar cell and the second solar cell include a solar cell structure according to any one of claims 1 to 27; In the battery structure, on the same side of the battery body in the second direction, the distance between the outer edge of the light-receiving surface extending along the first direction and the second edge region on that side is called the second distance. The first battery cell and the second battery cell are stacked on their adjacent sides to form a stacked region, and the width of the stacked region in the second direction is greater than the second spacing.

33. A solar cell module according to claim 32, characterized in that, In the battery structure, the second edge region includes a third sub-region and a fourth sub-region respectively located on both sides of the main region in a second direction. The reinforcing part includes a third unit located in the third sub-region and a fourth unit located in the fourth sub-region. The orthographic projection of the third unit corresponding to the first battery cell in the thickness direction of the first battery cell at least partially overlaps with the stacked region. 6.25L1≤D3+d2≤42.5L1, In the formula, D3 is the length of the third unit in the second direction; d2 is the second spacing; and L1 is the width of the stacked region in the second direction.

34. A photovoltaic system, characterized in that, Includes the solar cell module according to any one of claims 32 to 33.

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