Solar cell grid line pattern structure
By using staggered hexagonal diffusers and connecting lines to form a honeycomb grid, the problem of limited dispensing stencil design is solved, current collection efficiency and encapsulation effect are improved, and the risk of short circuit is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EGING PHOTOVOLTAIC TECHNOLOGY CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-05-01
AI Technical Summary
In the existing technology, the design size of the dispensing screen is limited, the alignment accuracy requirement is increased, the bonding force is insufficient, and the contact ability between the solder ribbon and the fine grid is weakened. This results in a narrow dispensing area, which is prone to printing misalignment or glue overflow covering the grid lines, causing poor contact between the solder ribbon and the fine grid and affecting the current collection efficiency.
A solar cell grid pattern structure is designed, which uses staggered hexagonal diffusers and connecting lines to form a honeycomb grid, increasing the longitudinal spacing, providing a dispensing buffer space, and avoiding the overlap of conductive channels through complementary structures, thereby optimizing the carrier diffusion path and stress distribution.
It improved the tolerance of glue overflow by 40%, reduced the risk of short circuit, enhanced the current collection efficiency, reduced the risk of poor contact between the solder ribbon and the grid, and optimized the encapsulation effect of the cell.
Smart Images
Figure CN224192360U_ABST
Abstract
Description
A solar cell grid pattern structure Technical Field
[0001] This utility model relates to the field of solar cell technology, and in particular to a solar cell grid pattern structure. Background Technology
[0002] As battery grids continue to iterate, grid patterns are evolving from MBB / SMBB (Multi-Block / Super-Multi-Block) to 0BB. Currently, mainstream gridless cell designs still largely employ conventional cell printing methods, with encapsulation processes generally divided into four types: lamination, Smartwire, dispensing, and soldering + dispensing. However, with increasing demands for cost reduction and efficiency, the number of fine grids in cells is gradually increasing, while the wire diameter is decreasing. For the dispensing process commonly used in modules, encapsulation becomes increasingly difficult. Key challenges include limitations on the size of the dispensing stencil, higher alignment accuracy requirements, insufficient bonding strength, and weakened contact between the solder ribbon and the fine grid. The dense vertical distribution of the fine grid lines results in a narrow dispensing area, making it prone to printing misalignment or glue overflow covering the grid lines, leading to poor contact between the solder ribbon and the fine grid, and affecting current collection efficiency. To address these issues, a new type of cell and dispensing pattern needs to be designed to adapt to the development of battery technology. Summary of the Invention
[0003] The technical problem to be solved by this utility model is: in order to overcome the limitations of the graphic size design of the dispensing screen in the prior art, the increased requirements for alignment accuracy, the insufficient bonding force, the weakened contact ability between the solder ribbon and the fine grid, the dense longitudinal distribution of the fine grid lines, which leads to a narrow dispensing reserved area, and the easy occurrence of poor contact between the solder ribbon and the fine grid due to printing misalignment or glue overflow covering the grid lines, thus affecting the current collection efficiency, a solar cell grid line graphic structure is provided.
[0004] The technical solution adopted by this utility model to solve its technical problem is: a solar cell grid line pattern structure, including a plurality of primary fine grid lines and a plurality of secondary fine grid lines arranged on the solar cell, wherein the primary fine grid lines and the secondary fine grid lines are arranged alternately.
[0005] The primary grid lines include primary connecting lines and a primary diffuser. The primary diffuser has a hexagonal structure, and the primary connecting lines and the primary diffuser are connected alternately along the longitudinal direction of the solar cell.
[0006] The secondary fine grid line includes secondary connecting lines and secondary diffusers. The secondary diffusers have a hexagonal structure, and the secondary connecting lines and secondary diffusers are connected alternately along the longitudinal direction of the solar cell. In the lateral direction of the solar cell, the primary diffusers and secondary connecting lines are distributed alternately. The longitudinally staggered hexagonal diffusers and connecting lines form a "honeycomb" grid, with the longitudinal spacing increased by 0.5-1.2mm, providing buffer space for dispensing and improving the tolerance of adhesive overflow by 40%. The lateral staggered layout makes the primary diffusers and secondary connecting lines form a complementary structure, avoiding overlapping of conductive channels and reducing the risk of short circuits.
[0007] To address the issue of ensuring longitudinal current conduction efficiency in solar cells while avoiding the risk of breakage of thin connecting wires, the design further includes a primary connecting wire length greater than 0.6 mm.
[0008] To address the issue of optimizing carrier diffusion paths and reducing lateral resistance loss in solar cells, a primary diffusion section is further included, comprising two primary diffusion segments connected at their corresponding ends. Each primary diffusion segment includes a primary diffusion line a, a primary diffusion line b, and a primary diffusion line c connected in sequence. The beginning of primary diffusion line a is connected to the end of a primary connecting line located in front of it, and the end of primary diffusion line c is connected to the end of a primary connecting line located behind it.
[0009] To address the issues of stress concentration and conductive area in solar cells and prevent microcrack propagation, the angle between the primary diffusion lines 'a' of the two primary diffusion sections in the primary diffusion section is further defined as 90°-170°.
[0010] To address the issue of achieving the optimal balance between stress distribution and light absorption in solar cells, the angle between the primary diffusion lines 'a' of the two primary diffusion sections in the primary diffusion unit is further defined as 120°.
[0011] To address the issue of maintaining conductivity continuity in solar cells while ensuring the depth of colloid penetration, the spacing between the primary diffusion lines b of the two primary diffusion sections of the primary diffusion section is further included to be 0.3 mm.
[0012] To address the issue of controlling the lateral carrier collection range in solar cells and avoiding edge recombination losses, a further step is to include a 1mm spacing between the beginning of the first-stage diffusion line a and the end of the first-stage diffusion line c in the first-stage diffusion section.
[0013] To address the issue of constructing a bidirectional current collection network for solar cells and improving power generation efficiency under low light conditions, a secondary diffusion section is further included, comprising two secondary diffusion segments connected at their corresponding ends. Each secondary diffusion segment includes a secondary diffusion line a, a secondary diffusion line b, and a secondary diffusion line c connected in sequence. The beginning of secondary diffusion line a is connected to the end of a secondary connecting line located in front of it, and the end of secondary diffusion line c is connected to the end of a secondary connecting line located behind it.
[0014] The beneficial effects of this utility model are as follows: The solar cell grid pattern structure provided by this utility model has a "honeycomb" grid formed by the longitudinally staggered hexagonal diffuser and connecting lines. The longitudinal spacing is increased by 0.5-1.2mm, which provides a buffer space for dispensing and increases the tolerance of glue overflow by 40%. The transverse staggered layout makes the primary diffuser and the secondary connecting lines form a complementary structure, avoiding the overlap of conductive channels and reducing the risk of short circuit. Attached Figure Description
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0016] Figure 1 is a structural schematic diagram of this utility model.
[0017] In the picture: 1. Solar cell,
[0018] 2. First-stage fine grid line; 21. First-stage connecting line; 22. First-stage diffuser section; 221. First-stage diffuser line a; 222. First-stage diffuser line b; 223. First-stage diffuser line c.
[0019] 3. Secondary fine grid line; 31. Secondary connecting line; 32. Secondary diffuser section; 321. Secondary diffuser line a; 322. Secondary diffuser line b; 323. Secondary diffuser line c. Detailed Implementation
[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0021] Figure 1 is a schematic diagram of the structure of this utility model, a solar cell grid line pattern structure, including a plurality of primary fine grid lines 2 and a plurality of secondary fine grid lines 3 arranged on the solar cell 1, the primary fine grid lines 2 and the secondary fine grid lines 3 being arranged alternately.
[0022] The primary fine grid line 2 includes a primary connecting line 21 and a primary diffusion section 22. The primary diffusion section 22 has a hexagonal structure, and the primary connecting line 21 and the primary diffusion section 22 are connected alternately in sequence along the longitudinal direction of the solar cell 1.
[0023] The secondary fine grid line 3 includes a secondary connecting line 31 and a secondary diffuser 32. The secondary diffuser 32 has a hexagonal structure, and the secondary connecting line 31 and the secondary diffuser 32 are connected alternately along the longitudinal direction of the solar cell 1. In the transverse direction of the solar cell 1, the primary diffuser 22 and the secondary connecting line 31 are distributed alternately. In the transverse direction of the solar cell 1, the primary connecting line 21 and the secondary diffuser 32 are distributed alternately. The longitudinally staggered hexagonal diffusers (primary diffuser 22 and secondary diffuser 32) and the connecting lines form a "honeycomb" grid. The longitudinal spacing is increased by 0.5-1.2mm, which provides a buffer space for dispensing and increases the tolerance of adhesive overflow by 40%. The transverse staggered layout makes the primary diffuser and the secondary connecting line form a complementary structure, avoiding the overlap of conductive channels and reducing the risk of short circuit.
[0024] After the hexagonal diffusion section (primary diffusion section 22 and secondary diffusion section 32) is processed in parallel, the longitudinal space reserved for dispensing is increased, which reduces the risk of poor contact between the solder ribbon and the fine grid caused by dispensing overflow or pattern offset, resulting in the adhesive covering the fine grid.
[0025] As shown in Figure 1, the length of the primary connecting line 21 is greater than 0.6mm, which limits the minimum length of the primary connecting line, ensures the longitudinal current conduction efficiency, and avoids the risk of breakage of thin connecting lines. The length of the primary connecting line > 0.6mm ensures the current conduction efficiency and reduces the number of auxiliary lines by 30% compared with the traditional design.
[0026] As shown in Figure 1, the primary diffusion section 22 includes two primary diffusion segments connected at their ends. Each primary diffusion segment includes a primary diffusion line a221, a primary diffusion line b222, and a primary diffusion line c223 connected in sequence. The first end of the primary diffusion line a221 is connected to the tail end of the primary connecting line 21 located in front of it, and the tail end of the primary diffusion line c223 is connected to the tail end of the primary connecting line 21 located behind it, thereby optimizing the carrier diffusion path and reducing lateral resistance loss.
[0027] As shown in Figure 1, the included angle between the primary diffusion lines a221 of the two primary diffusion sections of the primary diffusion section 22 is 90°-170°, which balances stress concentration and conductive area and prevents microcrack propagation.
[0028] As shown in Figure 1, the angle between the primary diffusion lines a221 of the two primary diffusion sections of the primary diffusion section 22 is 120°, achieving the optimal balance between stress distribution and light absorption. The 120° angle between the diffusion sections optimizes the stress distribution and increases the longitudinal tensile strength by 25%. While ensuring the printability of the fine grid, it greatly increases the design flexibility. It can extend the structure laterally, which can save paste and increase the tolerance of solder strip misalignment. It can also widen the width at the parallel line to enhance the contact effect with the solder strip and improve the current collection capability.
[0029] As shown in Figure 1, the spacing between the primary diffusion lines b222 of the two primary diffusion sections of the primary diffusion section 22 is 0.3 mm, which ensures the penetration depth of the colloid while maintaining the continuity of conductivity. The 0.3 mm spacing between diffusion lines, combined with the hexagonal topology, increases the penetration depth of the colloid by 50% and achieves an encapsulation bonding force of 35 N / cm².
[0030] As shown in Figure 1, the distance between the beginning of the primary diffusion line a221 and the end of the primary diffusion line c223 in the primary diffusion section is 1 mm. This controls the lateral carrier collection range and avoids edge recombination losses. The 1 mm distance between the beginning and end of the primary diffusion section maximizes the conductive area and reduces the amount of silver paste used per unit area by 15-20%.
[0031] As shown in Figure 1, the secondary diffusion section 32 includes two secondary diffusion segments connected at their ends. Each secondary diffusion segment includes a secondary diffusion line a321, a secondary diffusion line b322, and a secondary diffusion line c323 connected in sequence. The first end of the secondary diffusion line a321 is connected to the tail end of the secondary connecting line 31 located in front of it, and the tail end of the secondary diffusion line c323 is connected to the tail end of the secondary connecting line 31 located behind it, thus constructing a bidirectional current collection network to improve power generation efficiency under low light conditions.
[0032] The key feature of this application lies in its unique parallel structure of the battery pattern (primary diffuser 22, secondary diffuser 32), which ensures the performance of the battery end while optimizing module encapsulation, reducing process difficulty, and possessing good adaptability. It can be adjusted according to requirements to meet specific needs in areas such as battery printability, paste saving, and module solderability. The accompanying unique shuttle-shaped dispensing design effectively increases the fault tolerance of module stringing while maintaining good adhesion.
[0033] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A solar cell grid pattern structure, characterized in that, The solar cell (1) includes several primary fine grid lines (2) and several secondary fine grid lines (3) arranged on it. The primary fine grid lines (2) and secondary fine grid lines (3) are arranged alternately. The primary fine grid lines (2) include a primary connecting line (21) and a primary diffusion section (22). The primary diffusion section (22) has a hexagonal structure and the primary connecting line (21) and the primary diffusion section (22) are connected alternately in sequence along the longitudinal direction of the solar cell (1). The secondary fine grid lines (3) include a secondary connecting line (31) and a secondary diffusion section (32). The secondary diffusion section (32) has a hexagonal structure and the secondary connecting line (31) and the secondary diffusion section (32) are connected alternately in sequence along the longitudinal direction of the solar cell (1). In the transverse direction of the solar cell (1), the primary diffusion section (22) and the secondary connecting line (31) are distributed alternately.
2. The solar cell grid pattern structure as described in claim 1, characterized in that: The length of the primary connecting line (21) is greater than 0.6 mm.
3. The solar cell grid pattern structure as described in claim 1, characterized in that: The primary diffusion section (22) includes two primary diffusion segments connected at their ends. Each primary diffusion segment includes a primary diffusion line a (221), a primary diffusion line b (222), and a primary diffusion line c (223) connected in sequence. The first end of the primary diffusion line a (221) is connected to the tail end of the primary connecting line (21) located in front of it, and the tail end of the primary diffusion line c (223) is connected to the tail end of the primary connecting line (21) located behind it.
4. The solar cell grid pattern structure as described in claim 3, characterized in that: The included angle between the primary diffusion lines a (221) of the two primary diffusion sections of the primary diffusion section (22) is 90°-170°.
5. The solar cell grid pattern structure as described in claim 4, characterized in that: The included angle between the primary diffusion lines a (221) of the two primary diffusion sections of the primary diffusion section (22) is 120°.
6. The solar cell grid pattern structure as described in claim 3, characterized in that: The distance between the primary diffusion lines b (222) of the two primary diffusion sections of the primary diffusion section (22) is 0.3 mm.
7. The solar cell grid pattern structure as described in claim 3, characterized in that: The distance between the beginning of the first-stage diffusion line a (221) and the end of the first-stage diffusion line c (223) in the first-stage diffusion section is 1 mm.
8. The solar cell grid pattern structure as described in claim 1, characterized in that: The secondary diffusion section (32) includes two secondary diffusion segments connected at their ends. The secondary diffusion segments include a secondary diffusion line a (321), a secondary diffusion line b (322), and a secondary diffusion line c (323) connected in sequence. The first end of the secondary diffusion line a (321) is connected to the tail end of the secondary connecting line (31) located in front of it, and the tail end of the secondary diffusion line c (323) is connected to the tail end of the secondary connecting line (31) located behind it.