Solar cell
By introducing a fork-shaped connecting line into the grid line pattern of the solar cell to connect with the sub-grid line, the problem of black edge of EL caused by the solder ribbon breaking and the sub-grid line inside the fork is solved, which improves the current collection capability of the cell and the efficiency of the module.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-03-24
AI Technical Summary
Existing solar cells are prone to black edge issues in the EL (electroluminescent plate) due to the solder strip breaking off from the sub-grid line inside the harpoon during module stringing. Furthermore, existing methods that increase the wet weight of the paste printing are ineffective.
The grid pattern design includes main grid lines, sub-grid lines and their antennae. The antennae are connected to the sub-grid lines through harpoon-shaped connecting lines, replacing the traditional harpoon structure. This ensures sufficient silver paste when the solder ribbon is fused with the battery cell and paste, and avoids soldering circuit breaks.
It improves the black edge problem of EL, ensures that charge carriers are directly transferred to the solder strip, avoids soldering circuit breakage, and improves the current collection capability of the cell and the efficiency of the module.
Smart Images
Figure CN224037752U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic cell technical field, concretely relates to a solar cell piece. BACKGROUND
[0002] With the increasingly scarce of non-renewable resources, and some non-renewable resources cause various pollution problems in people's life and industrial production, therefore, all countries are using various policy or legal means to gradually increase the development and utilization of renewable energy and clean energy, and strive to improve its proportion in the whole energy use. Among the clean and renewable energy, solar energy is one of the most important energy, and the solar cell panel as the most important equipment in solar energy utilization needs to strictly control the quality of each component to improve the utilization rate of solar energy and prolong the service life of the solar cell panel.
[0003] Reducing cost and improving efficiency is an eternal topic for photovoltaic industry to get out of trouble and continuous development, and each photovoltaic cell enterprise is doing cost reduction work, especially reducing the large head of non-silicon cost-silver paste unit consumption. But with the continuous reduction of the unit consumption of the metallized paste of the cell piece, the existing cell piece printing pattern design encounters EL black edge problem in the component end, mainly caused by the welding breakage of the inner secondary grid line of the fishhook.
[0004] The solder strip and the inner secondary grid paste of the fishhook are co-melted during the welding of the component string, which can adsorb the surrounding paste. Since the inner grid line of the fishhook is thin and the silver amount is insufficient, the paste outside the solder strip area is adsorbed by the solder strip, thereby causing the open circuit phenomenon; thus, the carriers collected near the fishhook cannot be directly transmitted to the solder strip through the secondary grid, but can only be transmitted to the solder point (Pad point) through the fishhook, and then transmitted to the solder strip, the transmission distance of the carriers is too far, and part of them is recombined in the process, causing the EL of the region to be dark, presenting "EL black edge".
[0005] The conventional method simply widens and heightens the secondary grid line in the fishhook structure to improve this problem, but the paste printing wet weight will be obviously increased, and there is no advantage in conversion efficiency. UTILITY MODEL CONTENTS
[0006] To solve at least one technical problem of the prior art, the utility model provides a solar cell piece.
[0007] To achieve the above utility model purposes, a technical scheme adopted by the utility model is as follows: a solar cell piece, the cell piece has a grid line pattern on at least one side, the grid line pattern comprises a plurality of main grid lines extending along a first direction and being arranged at intervals in a second direction perpendicular to the first direction, a plurality of secondary grid lines extending along the second direction and being arranged at intervals in the first direction, and a tentacle part of the secondary grid lines, the tentacle part is used for communicating the main grid lines with the secondary grid lines.
[0008] The main grid line is provided with end pads and multiple intermediate pads at intervals.
[0009] The antennae include at least one first-type antenna, which is disposed on the outer side of the end pad along the main gate extension direction, wherein the outermost first-type antenna end is connected to a harpoon-shaped connecting line.
[0010] In some embodiments, the harpoon-shaped connecting line intersects with the corresponding sub-gate line, and the sub-gate line intersecting with the harpoon-shaped connecting line is a discontinuous gate line. The discontinuous end of the discontinuous gate line is located inside the first region formed by the harpoon-shaped connecting line, and the length of the discontinuous gate line extending into the first region is 0.4 mm ± 0.1 mm.
[0011] In some embodiments, extension segments are provided at both ends of the main grid line, and the first type of antenna includes a solid portion of equal width connected to the extension segment and two gradient portions connected to both ends of the solid portion, wherein the width of the gradient portions gradually decreases in the direction away from the solid portion along the second direction.
[0012] In some embodiments, the width H of the solid portion is 0.05mm ± 0.01mm, and the width of the gradient portion gradually changes from 0.05mm ± 0.01mm to 0.022mm ± 0.005mm.
[0013] In some embodiments, the length L of the plurality of said solid portions connected to one of said extensions increases from 0.94 mm ± 0.1 mm to 1.57 mm ± 0.1 mm along the first direction, and the length of the gradient portion is 0.09 mm ± 0.02 mm.
[0014] In some embodiments, the width of each of the harpoon-shaped connecting lines is 0.037 mm ± 0.007 mm.
[0015] In some embodiments, the spacing between the two harpoon-shaped connecting lines connected to the ends of the same first type of antennae gradually increases outward.
[0016] In some embodiments, the sub-grid lines include the discontinuous grid lines located at the edges of the grid line pattern and the continuous grid lines disposed between the discontinuous grid lines.
[0017] In some embodiments, the grid pattern has 200 to 240 sub-grid lines.
[0018] In some embodiments, the antennae further include at least one second type of antenna, which is disposed between the end pads.
[0019] Compared with existing technologies, the advantages of this utility model include:
[0020] This invention replaces the harpoon structure with a first type of antenna and a harpoon-shaped connecting line. When the solder strip, the battery cell, and the paste are fused together, the transverse direction of the first type of antenna provides enough silver paste to melt or adsorb the solder strip, preventing welding circuit breakage. This allows charge carriers to be directly transferred to the solder strip through the sub-gate, improving the black edge problem of the module's EL. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the surface of a solar cell in one embodiment of the present invention;
[0022] Figure 2 for Figure 1 Enlarged view of section A in the middle;
[0023] Figure 3 This is a schematic diagram of the structure of the present invention, including the contact angle. Detailed Implementation
[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0026] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0027] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.
[0028] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.
[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0030] Reference Figures 1 to 3 This utility model provides a solar cell, wherein the cell 1 has a grid pattern 2 on at least one side. The grid pattern 2 includes multiple main grid lines 21 extending along a first direction D1 and spaced apart on a second direction D2 perpendicular to the first direction D1, multiple sub-grid lines 22 extending along the second direction D2 and spaced apart on the first direction D1, multiple pads 23 spaced apart along the main grid lines 21, and a antenna portion for connecting the main grid lines 21 and the sub-grid lines 22.
[0031] A main gate line 21 is provided with two end pads 231 located at the outermost edge of the gate line pattern 2 and a plurality of intermediate pads 232 located between the two end pads 231. The antenna portion includes at least one first type antenna 25. The first type antenna 25 is located on the outer side of the end pads 231 along the extension direction of the main gate line 21. The end of the outermost first type antenna 25 is connected to a harpoon-shaped connecting line 26. The plurality of first type antennas 25 extend along the second direction D2 and are spaced apart on the first direction D1. The plurality of first type antennas 25 are respectively connected to a plurality of sub-gate lines 22 located on the outer side of the end pads 231.
[0032] This invention replaces the traditional harpoon structure with a first type of antenna 25 and a harpoon-shaped connecting line 26. When the solder strip, the battery cell, and the paste are fused together, the first type of antenna 25 provides enough silver paste in the transverse direction to melt or adsorb the solder strip, preventing welding circuit breakage. This allows charge carriers to be directly transferred to the solder strip through the sub-gate, improving the black edge problem of the module's EL.
[0033] In some embodiments, the sub-gate line 22 includes discontinuous gate lines 222 located at the edge of the gate line pattern 2 and continuous gate lines 221 disposed between the discontinuous gate lines 222. A harpoon-shaped connecting line 26 intersects with the corresponding sub-gate line 22. The sub-gate line 22 intersecting with the harpoon-shaped connecting line 26 is the discontinuous gate line 222. The discontinuous end of the discontinuous gate line 222 is located inside the first region 260 formed by the harpoon-shaped connecting line, and the length of the discontinuous gate line 222 extending into the first region 260 is 0.4 mm ± 0.1 mm. By extending the discontinuous gate line 222, it is possible to absorb more charge carriers while avoiding the problem of microcracks in the weld.
[0034] In some embodiments, two harpoon-shaped connecting lines 26 are connected to both ends of a first-type antenna 25, and the two harpoon-shaped connecting lines 26 connected to both ends of a first-type antenna 25 constitute a small harpoon structure. The width of each harpoon-shaped connecting line 26 is 0.037mm ± 0.007mm, and the spacing between the two harpoon-shaped connecting lines 26 connected to both ends of the same first-type antenna 25 gradually increases outward.
[0035] In some embodiments, the first type of antenna 25 is connected to the complete gate line 221 located outside the end pad 231. The two ends of the main gate line 21 are respectively provided with extension segments 211, which extend outward from the end pad 231 to the outermost complete gate line 221. The first type of antenna 25 is provided at the junction of the extension segment 211 and the complete gate line 221, and extends along the complete gate line 221 on both sides of the extension segment 211.
[0036] In some embodiments, the first type of antenna 25 includes a solid portion 251 of equal width connected to the extension 211 and two tapered portions 252 connected to both ends of the solid portion 251, the width of the tapered portions 252 gradually decreasing in a direction away from the solid portion 251 along the second direction D2.
[0037] In some embodiments, the width H of the solid portion 251 is 0.05mm ± 0.01mm, and the width of the gradient portion 252 gradually changes from 0.05mm ± 0.01mm to 0.022mm ± 0.005mm.
[0038] In some embodiments, the length L of a plurality of solid portions 251 connected to an extension 211 increases from 0.94 mm ± 0.1 mm to 1.57 mm ± 0.1 mm along a first direction D1, and the length of the gradient portion 252 is 0.09 mm ± 0.02 mm.
[0039] In some embodiments, the antennae also include at least one second-type antennae 24 disposed between the end pads 231, the second-type antennae 24 being at the junction of the main gate line 21 and the sub-gate line 22 and extending along the sub-gate line 22 on both sides of the main gate line 21.
[0040] Furthermore, the structure of the second type of antenna 24 is the same as that of the first type of antenna 25. The second type of antenna 24 includes a first portion of equal width connected to the main grid line 21. One end of the first portion contacts the main grid line 21, and the other end has a second portion. The width of the second portion gradually decreases in the direction away from the first portion along the second direction D2. Specifically, the width of the first portion is 0.05mm ± 0.01mm, and the width of the second portion gradually changes from 0.05mm ± 0.01mm to 0.022mm ± 0.005mm.
[0041] The length of the first part is 0.80mm ± 0.1mm, and the length of the second part is 0.16mm ± 0.02mm.
[0042] In some embodiments, the current collection capability of the solar cell 1 can be improved by increasing the number of sub-grid lines 22. The grid pattern 2 of a conventional solar cell 1 has 160 to 200 sub-grid lines 22, while the grid pattern 2 of this invention has 200 to 240 sub-grid lines 22.
[0043] Furthermore, as the number of sub-gate lines 22 in the gate pattern 2 increases, the width of each sub-gate line 22 decreases as the number of sub-gate lines 22 increases. Preferably, for every 10 additional sub-gate lines 22 in the gate pattern 2, the width of each sub-gate line 22 decreases by approximately 0.4 μm.
[0044] Furthermore, as the number of sub-gate lines 22 in the gate pattern 2 increases, the height of each sub-gate line 22 decreases as the number of sub-gate lines 22 increases. Preferably, for every 10 additional sub-gate lines 22 in the gate pattern 2, the height of each sub-gate line 22 decreases by 0.15 μm.
[0045] By reducing the width and / or height of the sub-grid line 22, the increase in slurry consumption caused by the increase in the number of sub-grid lines 22 can be reduced.
[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A solar cell, wherein the cell (1) has a grid pattern (2) on at least one side, the grid pattern (2) comprising a plurality of main grid lines (21) extending along a first direction (D1) and spaced apart in a second direction (D2) perpendicular to the first direction (D1), a plurality of sub-grid lines (22) extending along the second direction (D2) and spaced apart in the first direction (D1), and a tentacle portion thereof, the tentacle portion being used to communicate the main grid lines (21) and the sub-grid lines (22), wherein the main grid lines (21) are spaced apart with end pads (231) and a plurality of intermediate pads (232), characterized in that, The antennae include at least one first type antenna (25), which is disposed on the outer side of the end pad (231) along the extension direction of the main gate line (21), wherein the end of the outermost first type antenna (25) is connected to a harpoon-shaped connecting line (26).
2. The solar cell according to claim 1, characterized in that, The harpoon-shaped connecting line (26) intersects with the corresponding sub-gate line (22). The sub-gate line (22) intersecting with the harpoon-shaped connecting line (26) is a discontinuous gate line (222). The discontinuous end of the discontinuous gate line (222) is located inside the first region (260) formed by the harpoon-shaped connecting line (26). The length of the discontinuous gate line (222) extending into the first region (260) is 0.4mm ± 0.1mm.
3. The solar cell according to claim 1, characterized in that, The main grid line (21) has extension sections (211) at both ends. The first type of antenna (25) includes a solid portion (251) of equal width connected to the extension section (211) and two gradient portions (252) connected to both ends of the solid portion (251). The width of the gradient portion (252) gradually decreases in the direction away from the solid portion (251) along the second direction (D2).
4. The solar cell according to claim 3, characterized in that, The width H of the solid portion (251) is 0.05mm ± 0.01mm, and the width of the gradient portion (252) gradually changes from 0.05mm ± 0.01mm to 0.022mm ± 0.005mm.
5. The solar cell according to claim 3, characterized in that, The length L of the plurality of solid portions (251) connected to one of the extension segments (211) increases from 0.94 mm ± 0.1 mm to 1.57 mm ± 0.1 mm along the first direction (D1), and the length of the gradient portion (252) is 0.09 mm ± 0.02 mm.
6. The solar cell according to claim 1, characterized in that, The width of each of the harpoon-shaped connecting lines (26) is 0.037 mm ± 0.007 mm.
7. The solar cell according to claim 1, characterized in that, The spacing between the two harpoon-shaped connecting lines (26) connected to the ends of the same first type of antenna (25) gradually increases outward.
8. The solar cell according to claim 2, characterized in that, The sub-grid line (22) includes the discontinuous grid line (222) located at the edge of the grid line pattern (2) and the complete grid line (221) disposed between the discontinuous grid lines (222).
9. The solar cell according to claim 1, characterized in that, The grid pattern (2) has 200 to 240 sub-grid lines (22).
10. The solar cell according to any one of claims 1 to 9, characterized in that, The antennae also include at least one second type antenna (24) disposed between the end pads (231).