WO2023169507A1 - Laser grooving structure on the back surface of double-sided solar cell - Google Patents

Laser grooving structure on the back surface of double-sided solar cell Download PDF

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Publication number
WO2023169507A1
WO2023169507A1 PCT/CN2023/080450 CN2023080450W WO2023169507A1 WO 2023169507 A1 WO2023169507 A1 WO 2023169507A1 CN 2023080450 W CN2023080450 W CN 2023080450W WO 2023169507 A1 WO2023169507 A1 WO 2023169507A1
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Prior art keywords
laser grooving
line
laser
double
lines
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PCT/CN2023/080450
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French (fr)
Chinese (zh)
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左景武
陈红
简磊
常永胜
陆玉刚
卓启东
李汉诚
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天合光能科技(盐城)有限公司
天合光能股份有限公司
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Publication of WO2023169507A1 publication Critical patent/WO2023169507A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0236—Special surface textures

Definitions

  • the present application belongs to the technical field of solar cells, relates to a laser grooved structure, and in particular relates to a laser grooved structure on the back of a double-sided solar cell.
  • solar cells can instantly output voltage and generate current under the condition of a loop.
  • the back side of the double-sided solar cell has a local metal back electric field. Unlike the positive electrode slurry, the back field slurry does not have the ability to burn through the insulating layer dielectric film. Therefore, laser ablation is used to remove the dielectric film on the back side to facilitate the back field slurry.
  • the material can form ohmic contact with the silicon base.
  • the laser grooved structure on the back of the double-sided solar cell basically only opens the fine grid line part, and the homogenization is serious. This will lead to a large overall series resistance of the battery and easily cause problems such as power loss. It is not the best opening design. .
  • CN204391125U discloses a laser slotted graphic structure on the back of a photovoltaic cell, which includes a graphic body.
  • the graphic body has: a plurality of mutually parallel mold opening line segments or dotted line segments; a plurality of adhesion enhancement parts, and the adhesion enhancement part has a
  • the open film area attached to the silicon substrate and the non-open film area used to attach the passivation film, and the open film area and the non-open film area are arranged at intervals, in order to improve the connection between the back electrode and the back electrode without affecting the battery conversion efficiency.
  • the contact of the silicon wafer enhances the adhesion of the back electrode and reduces the risk of the back electrode falling off, but there is still a serious homogenization problem, causing power loss.
  • CN212783465U discloses a back-passivation double-sided solar cell back laser slotting structure, which includes several laser slots distributed side by side on the back of the battery.
  • Each laser slot is a double-line slot covered by the same aluminum grid line.
  • two slots are designed under any aluminum grid line, and the light spots of the two slots are distributed in a staggered manner. It can effectively reduce the current transmission distance between adjacent light spots and reduce the current loss caused by lateral resistance: and when considering the aluminum voids, adding a slot under any aluminum grid line effectively increases the current transmission route. It can reduce the battery conversion efficiency caused by the obstruction of current transmission.
  • the overall series resistance of the battery is large and it is easy to cause power loss and other problems. It is not the best laser slotting design.
  • CN211957653U discloses a PERC battery passivation film that reduces series resistance, including a PERC battery.
  • the silicon wafer of the PERC battery is provided with a passivation film
  • the passivation film is provided with a point slot group
  • the passivation film is provided with a hollow area group.
  • the point slotting group is parallel to the transverse centerline of the passivation film
  • the hollow area group is parallel to the vertical centerline of the passivation film
  • the hollow area group intersects with the point slotting group
  • the point slotting group is along the vertical direction of the passivation film
  • the uniform distribution of the center line can make the interceptor path consistent in all directions, reduce the series resistance, and greatly increase the fill factor. Because the open film area is reduced, the open voltage and current are increased, and the efficiency is improved.
  • a laser grooved structure on the back side of a double-sided solar cell is provided.
  • the laser grooved structure on the back of the double-sided solar cell includes evenly distributed hollow areas and laser grooved lines;
  • the laser grooving line includes at least one ring-shaped laser grooving line and at least one fine grating laser grooving line, and the inner area of the ring-shaped laser grooving line toward the center of the ring is a hollow area;
  • the fine grating laser groove lines are parallel to the horizontal lines.
  • the laser grooving line further includes at least one backfield main grid connection line laser grooving line.
  • the laser grooving lines further include laser grooving lines around the back field edge lines.
  • two or more fine grating laser groove lines are parallel to each other.
  • two or more of the backfield busbar connection line laser groove lines are parallel to each other.
  • the fine grid line laser grooving line and the back field main grid connecting line laser grooving line are perpendicular to each other. straight.
  • the ring-shaped laser grooving line intersects the laser grooving line of the backfield main grid connection line.
  • the ring-shaped laser grooving line is an elliptical laser grooving line.
  • the width of the laser groove line is about 2 ⁇ m to about 100 ⁇ m, for example, it can be 2 ⁇ m, 5 ⁇ m, 10 ⁇ m, 20 ⁇ m, 30 ⁇ m, 40 ⁇ m, 50 ⁇ m, 60 ⁇ m, 70 ⁇ m, 80 ⁇ m, 90 ⁇ m or 100 ⁇ m, but It is not limited to the listed values, and other unlisted values within the range of values are also applicable.
  • the depth of the laser groove line is about 0.1 ⁇ m to about 2 ⁇ m, for example, it can be 0.1 ⁇ m, 0.3 ⁇ m, 0.5 ⁇ m, 0.7 ⁇ m, 0.9 ⁇ m, 1.0 ⁇ m, 1.2 ⁇ m, 1.4 ⁇ m, 1.6 ⁇ m, 1.8 ⁇ m or 2.0 ⁇ m, but are not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • Figure 1 is a schematic diagram of the laser grooved structure on the back side of the double-sided solar cell described in Embodiment 1-3;
  • Figure 2 is a partially enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell described in Embodiment 1-3;
  • Figure 3 is a partially enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell described in Embodiment 1 after being brushed with aluminum paste;
  • Figure 4 is a schematic diagram of the laser grooved structure on the back of the double-sided solar cell described in Comparative Example 1;
  • 1-hollow area 2-back field main grid connection line laser grooving line, 3-elliptical laser grooving line, 4-back field edge line laser grooving line, 5-fine grid line laser grooving line , 6-back field main grid connection line laser grooved line aluminum paste printing area, 7-electrode printing aluminum paste area.
  • the purpose of this application is to provide a laser grooved structure on the back of a double-sided solar cell, which can improve the transmission path of the battery current, improve the ohmic contact, reduce the series resistance, optimize the filling factor and improve the battery's performance. short circuit current.
  • This embodiment provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 1.
  • the laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and laser grooving lines;
  • the laser grooving line includes an elliptical laser grooving line 3, a fine grid line laser grooving line 5, a back field main grid connecting line laser grooving line 2 and a back field surrounding edge line laser grooving line 4;
  • the inner area of the elliptical laser grooving line 3 toward the center of the circle is the hollow area 1; the fine grating laser grooving line 5 is parallel to the horizontal line;
  • the fine grid laser grooving lines 5 are parallel to each other, the back field main grid connecting line laser grooving lines 2 are parallel to each other, the fine grid laser grooving lines 5 and the back field main grid connecting line laser grooving lines 2 are perpendicular to each other, and the elliptical laser slotting line 3 intersects with the back field main grid connection line laser slotting line 2;
  • the width of the laser grooving line is 50 ⁇ m, and the depth of the laser grooving line is 1 ⁇ m;
  • Aluminum paste is printed in the aluminum paste printing area 6 of the laser grooving line of the back field main grid connection line and the aluminum paste printing area 7 of the electrode;
  • FIG. 2 A partially enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell in this embodiment is shown in Figure 2, and a partially enlarged schematic diagram after brushing with aluminum paste is shown in Figure 3;
  • laser slotting lines are provided at the fine grid lines, around the hollow area 1, the back field main grid connection lines and the edge lines around the back field.
  • This embodiment provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 1.
  • the laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and laser grooving lines;
  • the laser grooving line includes an elliptical laser grooving line 3, a fine grid line laser grooving line 5, a back field main grid connecting line laser grooving line 2 and a back field surrounding edge line laser grooving line 4;
  • the inner area of the elliptical laser grooving line 3 toward the center of the circle is the hollow area 1; the fine grating laser grooving line 5 is parallel to the horizontal line;
  • the fine grid laser grooving lines 5 are parallel to each other, the back field main grid connecting line laser grooving lines 2 are parallel to each other, the fine grid laser grooving lines 5 and the back field main grid connecting line laser grooving lines 2 are perpendicular to each other, and the elliptical laser slotting line 3 intersects with the back field main grid connection line laser slotting line 2;
  • the width of the laser groove line is 2 ⁇ m, and the depth of the laser groove line is 0.1 ⁇ m;
  • FIG. 2 A partial enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell in this embodiment is shown in Figure 2;
  • laser slotting lines are also provided at the fine grid lines, around the hollow area 1, the back field main grid connection lines, and around the back field edge lines, which can minimize the series resistance of the double-sided battery and improve efficiency.
  • This embodiment provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 1.
  • the laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and laser grooving lines;
  • the laser grooving line includes an elliptical laser grooving line 3, a fine grid line laser grooving line 5, a back field main grid connecting line laser grooving line 2 and a back field surrounding edge line laser grooving line 4;
  • the inner area of the elliptical laser grooving line 3 toward the center of the circle is the hollow area 1; the fine grating laser grooving line 5 is parallel to the horizontal line;
  • the fine grid laser grooving lines 5 are parallel to each other, and the back field main grid connection line laser grooving lines 2 are parallel to each other.
  • the fine grid laser grooving line 5 and the back field main grid connecting line laser grooving line 2 are perpendicular to each other, and the elliptical laser grooving line 3 intersects with the back field main grid connecting line laser grooving line 2;
  • the width of the laser grooving line is 100 ⁇ m, and the depth of the laser grooving line is 2 ⁇ m;
  • FIG. 2 A partial enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell in this embodiment is shown in Figure 2;
  • laser slotting lines are also provided at the fine grid lines, around the hollow area 1, the back field main grid connection lines, and around the back field edge lines, which can minimize the series resistance of the double-sided battery and improve efficiency.
  • This embodiment provides a laser grooving structure on the back of a double-sided solar cell.
  • the laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas and laser grooving lines;
  • the laser grooving lines include elliptical laser grooving lines, fine grid line laser grooving lines and back field peripheral edge line laser grooving lines;
  • the inner area of the elliptical laser grooving line toward the center of the circle is a hollow area; the fine grating laser grooving line is parallel to the horizontal line;
  • the fine grating laser grooving lines are parallel to each other;
  • the width of the laser grooving line is 50 ⁇ m, and the depth of the laser grooving line is 1 ⁇ m;
  • laser grooving lines are provided at the fine grid lines, around the hollow area, and around the edge lines of the back field, but no laser grooving lines are provided at the back field main grid connection lines. Compared with the battery efficiency of Embodiment 1 Lower slightly.
  • This embodiment provides a laser grooving structure on the back of a double-sided solar cell.
  • the laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas and laser grooving lines;
  • the laser grooving lines include elliptical laser grooving lines and fine grid laser grooving lines;
  • the inner area of the elliptical laser grooving line 3 toward the center of the circle is a hollow area; the fine grating laser grooving line is parallel to the horizontal line;
  • the fine grating laser grooving lines are parallel to each other;
  • the width of the laser grooving line is 50 ⁇ m, and the depth of the laser grooving line is 1 ⁇ m;
  • laser slotting lines are only provided at the fine grid lines and around the hollow area, but not at the back field main grid connection lines and Laser groove lines are provided at the edge lines around the back field, which results in a slightly lower cell efficiency compared to Embodiment 1.
  • This comparative example provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 4.
  • the laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and fine grid laser grooving lines 5. ;
  • the fine grating laser grooving lines 5 are parallel to the horizontal line; the fine grating laser grooving lines 5 are parallel to each other;
  • the width of the laser grooving line is 50 ⁇ m, and the depth of the laser grooving line is 1 ⁇ m;
  • the laser slotting structure provided by this application is the optimal slotting structure for the back field of double-sided batteries, which can effectively improve the current transmission path, improve ohmic contact, reduce series resistance, and increase the short-circuit current of the battery. And optimize the fill factor to improve the efficiency of bifacial cells.
  • the laser grooved structure on the back of the double-sided solar cell includes evenly distributed hollow areas 1 and laser grooved lines; the laser grooved lines include at least one ring-shaped laser grooved line and at least one fine grid.
  • the inner area of the linear laser grooving line 5 and the ring laser grooving line toward the center of the ring is the hollow area 1; the fine grid laser grooving line 5 is parallel to the horizontal line.
  • the back of the double-sided battery in this application is not only laser-grooved at the fine grid lines, but also laser-grooved around the hollow area 1, which solves the problem of serious homogenization caused by only slotting at the fine grid lines, and the overall series resistance is large and easy to Regarding the problem of power loss, laser grooves around the hollow area 1 can improve the current transmission path, improve ohmic contact, reduce series resistance, and increase the short-circuit current of the battery.
  • the laser grooving line further includes at least one backfield busbar connection line laser grooving line 2 .
  • the laser grooving lines also include backfield peripheral edge line laser grooving lines 4 .
  • This application also performs laser grooves on the back field main grid connection lines and the edge lines around the back field. Through the interaction and cooperation between multiple groove lines, the ohmic contact can be further improved, the series resistance can be reduced, and the short circuit of the battery can be improved. current, optimizing fill factor.
  • the ring-shaped laser grooving line is an elliptical laser grooving line 3 .
  • the laser grooved line has a width of about 2 ⁇ m to about 100 ⁇ m, such as, but not limited to, 2 ⁇ m, 5 ⁇ m, 10 ⁇ m, 20 ⁇ m, 30 ⁇ m, 40 ⁇ m, 50 ⁇ m, 60 ⁇ m, 70 ⁇ m, 80 ⁇ m, 90 ⁇ m, or 100 ⁇ m.
  • ⁇ m 2 ⁇ m
  • 5 ⁇ m 10 ⁇ m
  • 20 ⁇ m 20 ⁇ m
  • 30 ⁇ m 40 ⁇ m
  • 50 ⁇ m 60 ⁇ m
  • 70 ⁇ m 70 ⁇ m
  • 80 ⁇ m 90 ⁇ m
  • the depth of the laser grooved line is about 0.1 ⁇ m to about 2 ⁇ m, for example, it can be 0.1 ⁇ m, 0.3 ⁇ m, 0.5 ⁇ m, 0.7 ⁇ m, 0.9 ⁇ m, 1.0 ⁇ m, 1.2 ⁇ m, 1.4 ⁇ m, 1.6 ⁇ m, 1.8 ⁇ m or 2.0 ⁇ m, but it is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the slotted structure provided by this application is the most optimal slotted structure for the back field of bifacial solar cells. It can solve the problems of large series resistance of bifacial cells and easy power loss, and can improve the current transmission path and ohm. contact, reduce series resistance, increase the short-circuit current of the battery, and optimize the fill factor, thereby improving the efficiency of the battery.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

The present application provides a laser grooving structure on the back surface of a double-sided solar cell. The laser grooving structure on the back surface of the double-sided solar cell comprises hollowed-out areas (1) and laser grooving lines which are uniformly distributed; each laser grooving line comprises at least one annular laser grooving line and at least one finger laser grooving line (5); the internal area of the annular laser grooving line facing a ring center direction is a hollowed-out area (1); the finger laser grooving line (5) is parallel to a horizontal line.

Description

一种双面太阳能电池背面激光开槽结构A laser grooved structure on the back of a double-sided solar cell
交叉引用cross reference
本申请引用于2022年03月09日递交的名称为“一种双面太阳能电池背面激光开槽结构”的第2022204987559号中国专利申请，其通过引用被全部并入本申请。This application cites Chinese patent application No. 2022204987559 titled "A Laser Grooving Structure on the Backside of a Bifacial Solar Cell" submitted on March 9, 2022, which is fully incorporated into this application by reference.
技术领域Technical field
本申请属于太阳能电池技术领域，涉及激光开槽结构，尤其涉及一种双面太阳能电池背面激光开槽结构。The present application belongs to the technical field of solar cells, relates to a laser grooved structure, and in particular relates to a laser grooved structure on the back of a double-sided solar cell.
背景技术Background technique
太阳能电池在满足一定的光照条件时，可以在有回路的条件下瞬间输出电压并且产生电流。双面太阳能电池的背面为局部金属背电场，不同于正电极浆料，背场浆料对绝缘层介质膜并没有烧穿的能力，因此背面采用激光消融的方法去除介质膜，以便背场浆料能够和硅基形成欧姆接触。目前双面太阳能电池背面激光开槽结构基本只开孔细栅线部分，同质化比较严重，这样将会导致电池整体串阻较大，易造功率损失等问题，并非最佳的开孔设计。When certain lighting conditions are met, solar cells can instantly output voltage and generate current under the condition of a loop. The back side of the double-sided solar cell has a local metal back electric field. Unlike the positive electrode slurry, the back field slurry does not have the ability to burn through the insulating layer dielectric film. Therefore, laser ablation is used to remove the dielectric film on the back side to facilitate the back field slurry. The material can form ohmic contact with the silicon base. At present, the laser grooved structure on the back of the double-sided solar cell basically only opens the fine grid line part, and the homogenization is serious. This will lead to a large overall series resistance of the battery and easily cause problems such as power loss. It is not the best opening design. .
CN204391125U公开了一种光伏电池背面激光开槽图形结构，包括图形主体，图形主体具有：多条相互平行的开模线段或虚线段；多个附着力增强部分，所述附着力增强部分具有用于附着硅基体的开膜区域和用于附着钝化膜的非开膜区域，并且开膜区域和非开膜区域呈间隔排列状，其为了在不影响电池转化效率的前提下，改善背电极与硅片的接触，增强背电极的附着力，降低背电极脱落风险，但是仍存在严重同质化问题，造成功率损失。CN204391125U discloses a laser slotted graphic structure on the back of a photovoltaic cell, which includes a graphic body. The graphic body has: a plurality of mutually parallel mold opening line segments or dotted line segments; a plurality of adhesion enhancement parts, and the adhesion enhancement part has a The open film area attached to the silicon substrate and the non-open film area used to attach the passivation film, and the open film area and the non-open film area are arranged at intervals, in order to improve the connection between the back electrode and the back electrode without affecting the battery conversion efficiency. The contact of the silicon wafer enhances the adhesion of the back electrode and reduces the risk of the back electrode falling off, but there is still a serious homogenization problem, causing power loss.
CN212783465U公开了一种背面钝化双面太阳能电池背激光开槽结构，包括若干条并列分布在电池背面上的激光开槽，每条激光开槽为被同一条铝栅线覆盖的双线开槽，在不考虑铝空洞的情况下，在任一铝栅线下设计两条开槽，两条开槽的光斑呈错位方式分布， 可有效减小相邻光斑间电流传输的距离，减小横向电阻带来的电流损失：而在考虑铝空洞的情况下，在任一铝栅线下增设一条开槽有效增加了电流传输的路线，降低因电流传输受阻带来的电池转换效率降低，但是电池整体串阻较大，易造功率损失等问题，并非最佳的激光开槽设计。CN212783465U discloses a back-passivation double-sided solar cell back laser slotting structure, which includes several laser slots distributed side by side on the back of the battery. Each laser slot is a double-line slot covered by the same aluminum grid line. , without considering aluminum voids, two slots are designed under any aluminum grid line, and the light spots of the two slots are distributed in a staggered manner. It can effectively reduce the current transmission distance between adjacent light spots and reduce the current loss caused by lateral resistance: and when considering the aluminum voids, adding a slot under any aluminum grid line effectively increases the current transmission route. It can reduce the battery conversion efficiency caused by the obstruction of current transmission. However, the overall series resistance of the battery is large and it is easy to cause power loss and other problems. It is not the best laser slotting design.
CN211957653U公开了一种减少串联电阻的PERC电池钝化膜，包括PERC电池，PERC电池的硅片上设有钝化膜，钝化膜上设有点开槽组，钝化膜上设有镂空区域组，点开槽组与钝化膜的横向中心线平行，镂空区域组与钝化膜的竖向中心线平行，镂空区域组与点开槽组相交；点开槽组沿钝化膜的竖向中心线均匀分布，可使截流子各个方向路径一致，减少了串联电阻，也使得填充因子大幅提升，因开膜面积减少，所以增加了开压和电流，提高了效率。CN211957653U discloses a PERC battery passivation film that reduces series resistance, including a PERC battery. The silicon wafer of the PERC battery is provided with a passivation film, the passivation film is provided with a point slot group, and the passivation film is provided with a hollow area group. , the point slotting group is parallel to the transverse centerline of the passivation film, the hollow area group is parallel to the vertical centerline of the passivation film, the hollow area group intersects with the point slotting group; the point slotting group is along the vertical direction of the passivation film The uniform distribution of the center line can make the interceptor path consistent in all directions, reduce the series resistance, and greatly increase the fill factor. Because the open film area is reduced, the open voltage and current are increased, and the efficiency is improved.
基于以上研究，需要提供一种双面太阳能电池背面激光开槽结构，能够通过综合各方面因素，改善电流的传输路径，减小串阻面积，提高电池的效率。Based on the above research, it is necessary to provide a laser-grooved structure on the back of a double-sided solar cell that can improve the current transmission path, reduce the series resistance area, and improve the efficiency of the cell by integrating various factors.
发明内容Contents of the invention
根据本申请的各种实施例，提供一种双面太阳能电池背面激光开槽结构。本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其它特征、目的和优点将从说明书、附图以及权利要求书变得明显。According to various embodiments of the present application, a laser grooved structure on the back side of a double-sided solar cell is provided. The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the application will become apparent from the description, drawings and claims.
所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区和激光开槽线；The laser grooved structure on the back of the double-sided solar cell includes evenly distributed hollow areas and laser grooved lines;
所述激光开槽线包括至少一个环形激光开槽线和至少一个细栅线激光开槽线，所述环形激光开槽线朝向环心方向的内部区域为镂空区；The laser grooving line includes at least one ring-shaped laser grooving line and at least one fine grating laser grooving line, and the inner area of the ring-shaped laser grooving line toward the center of the ring is a hollow area;
所述细栅线激光开槽线与水平线平行。The fine grating laser groove lines are parallel to the horizontal lines.
在其中一个实施例中，所述激光开槽线还包括至少一个背场主栅连接线激光开槽线。In one embodiment, the laser grooving line further includes at least one backfield main grid connection line laser grooving line.
在其中一个实施例中，所述激光开槽线还包括背场四周边缘线激光开槽线。In one of the embodiments, the laser grooving lines further include laser grooving lines around the back field edge lines.
在其中一个实施例中，两个以上所述细栅线激光开槽线之间相互平行。In one embodiment, two or more fine grating laser groove lines are parallel to each other.
在其中一个实施例中，两个以上所述背场主栅连接线激光开槽线之间相互平行。In one of the embodiments, two or more of the backfield busbar connection line laser groove lines are parallel to each other.
在其中一个实施例中，所述细栅线激光开槽线和背场主栅连接线激光开槽线相互垂 直。In one embodiment, the fine grid line laser grooving line and the back field main grid connecting line laser grooving line are perpendicular to each other. straight.
在其中一个实施例中，所述环形激光开槽线与背场主栅连接线激光开槽线相交。In one embodiment, the ring-shaped laser grooving line intersects the laser grooving line of the backfield main grid connection line.
在其中一个实施例中，所述环形激光开槽线为椭圆形激光开槽线。In one embodiment, the ring-shaped laser grooving line is an elliptical laser grooving line.
在其中一个实施例中，所述激光开槽线的宽度为约2μm-约100μm，例如可以是2μm、5μm、10μm、20μm、30μm、40μm、50μm、60μm、70μm、80μm、90μm或100μm，但并不仅限于所列举的数值，该数值范围内其他未列举的数值同样适用。In one embodiment, the width of the laser groove line is about 2 μm to about 100 μm, for example, it can be 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm, but It is not limited to the listed values, and other unlisted values within the range of values are also applicable.
在其中一个实施例中，所述激光开槽线的深度为约0.1μm-约2μm，例如可以是0.1μm、0.3μm、0.5μm、0.7μm、0.9μm、1.0μm、1.2μm、1.4μm、1.6μm、1.8μm或2.0μm，但并不仅限于所列举的数值，该数值范围内其他未列举的数值同样适用。In one embodiment, the depth of the laser groove line is about 0.1 μm to about 2 μm, for example, it can be 0.1 μm, 0.3 μm, 0.5 μm, 0.7 μm, 0.9 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6μm, 1.8μm or 2.0μm, but are not limited to the listed values, and other unlisted values within this numerical range are also applicable.
附图说明Description of the drawings
为了更好地描述和说明这里公开的那些发明的实施例和/或示例，可以参考一幅或多幅附图。用于描述附图的附加细节或示例不应当被认为是对所公开的发明、目前描述的实施例和/或示例以及目前理解的这些发明的最佳模式中的任何一者的范围的限制。To better describe and illustrate embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the drawings should not be construed as limiting the scope of any of the disclosed inventions, the embodiments and/or examples presently described, and the best modes currently understood of these inventions.
图1为实施例1-3所述双面太阳能电池背面激光开槽结构的示意图；Figure 1 is a schematic diagram of the laser grooved structure on the back side of the double-sided solar cell described in Embodiment 1-3;
图2为实施例1-3所述双面太阳能电池背面激光开槽结构的局部放大示意图；Figure 2 is a partially enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell described in Embodiment 1-3;
图3为实施例1所述双面太阳能电池背面激光开槽结构刷铝浆后的局部放大示意图；Figure 3 is a partially enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell described in Embodiment 1 after being brushed with aluminum paste;
图4为对比例1所述双面太阳能电池背面激光开槽结构的示意图；Figure 4 is a schematic diagram of the laser grooved structure on the back of the double-sided solar cell described in Comparative Example 1;
其中，1-镂空区，2-背场主栅连接线激光开槽线，3-椭圆形激光开槽线，4-背场四周边缘线激光开槽线，5-细栅线激光开槽线，6-背场主栅连接线激光开槽线铝浆印刷区，7-电极印刷铝浆区。Among them, 1-hollow area, 2-back field main grid connection line laser grooving line, 3-elliptical laser grooving line, 4-back field edge line laser grooving line, 5-fine grid line laser grooving line , 6-back field main grid connection line laser grooved line aluminum paste printing area, 7-electrode printing aluminum paste area.
具体实施方式Detailed ways
需要理解的是，在本申请的描述中，术语“中心”、“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而 不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”等的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。It should be understood that in the description of this application, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and Simplified description, while It is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the present application. Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined by "first,""second," etc. may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise stated, "plurality" means two or more.
需要说明的是，在本申请的描述中，除非另有明确的规定和限定，术语“设置”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以通过具体情况理解上述术语在本申请中的具体含义。It should be noted that in the description of this application, unless otherwise clearly stated and limited, the terms "set", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood through specific circumstances.
针对现有技术存在的不足，本申请的目的在于提供一种双面太阳能电池背面激光开槽结构，能够改善电池电流的传输路径，改善欧姆接触，减小串阻，优化填充因子以及提高电池的短路电流。In view of the shortcomings of the existing technology, the purpose of this application is to provide a laser grooved structure on the back of a double-sided solar cell, which can improve the transmission path of the battery current, improve the ohmic contact, reduce the series resistance, optimize the filling factor and improve the battery's performance. short circuit current.
下面结合附图并通过具体实施方式来进一步说明本申请的技术方案。The technical solution of the present application will be further described below with reference to the accompanying drawings and through specific implementation methods.
实施例1Example 1
本实施例提供了一种如图1所示的双面太阳能电池背面激光开槽结构，所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区1和激光开槽线；This embodiment provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 1. The laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and laser grooving lines;
所述激光开槽线包括椭圆形激光开槽线3、细栅线激光开槽线5、背场主栅连接线激光开槽线2和背场四周边缘线激光开槽线4；The laser grooving line includes an elliptical laser grooving line 3, a fine grid line laser grooving line 5, a back field main grid connecting line laser grooving line 2 and a back field surrounding edge line laser grooving line 4;
所述椭圆形激光开槽线3朝向圆心方向的内部区域为镂空区1；所述细栅线激光开槽线5与水平线平行；The inner area of the elliptical laser grooving line 3 toward the center of the circle is the hollow area 1; the fine grating laser grooving line 5 is parallel to the horizontal line;
所述细栅线激光开槽线5之间相互平行，背场主栅连接线激光开槽线2之间相互平行，细栅线激光开槽线5和背场主栅连接线激光开槽线2相互垂直，椭圆形激光开槽线3与背场主栅连接线激光开槽线2相交；The fine grid laser grooving lines 5 are parallel to each other, the back field main grid connecting line laser grooving lines 2 are parallel to each other, the fine grid laser grooving lines 5 and the back field main grid connecting line laser grooving lines 2 are perpendicular to each other, and the elliptical laser slotting line 3 intersects with the back field main grid connection line laser slotting line 2;
所述激光开槽线的宽度为50μm，所述激光开槽线的深度为1μm；The width of the laser grooving line is 50 μm, and the depth of the laser grooving line is 1 μm;
在背场主栅连接线激光开槽线铝浆印刷区6，电极印刷铝浆区7处印刷铝浆； Aluminum paste is printed in the aluminum paste printing area 6 of the laser grooving line of the back field main grid connection line and the aluminum paste printing area 7 of the electrode;
本实施例所述双面太阳能电池背面激光开槽结构的局部放大示意图如图2所示，刷铝浆后的局部放大示意图如图3所示；A partially enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell in this embodiment is shown in Figure 2, and a partially enlarged schematic diagram after brushing with aluminum paste is shown in Figure 3;
本实施例在细栅线处、镂空区1四周、背场主栅连接线以及背场四周边缘线均设置激光开槽线，为最优化的开槽结构设计，能最大程度上降低双面电池串阻，提升效率。In this embodiment, laser slotting lines are provided at the fine grid lines, around the hollow area 1, the back field main grid connection lines and the edge lines around the back field. This is an optimized slot structure design that can minimize the cost of double-sided cells. Series resistance improves efficiency.
实施例2Example 2
本实施例提供了一种如图1所示的双面太阳能电池背面激光开槽结构，所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区1和激光开槽线；This embodiment provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 1. The laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and laser grooving lines;
所述激光开槽线包括椭圆形激光开槽线3、细栅线激光开槽线5、背场主栅连接线激光开槽线2和背场四周边缘线激光开槽线4；The laser grooving line includes an elliptical laser grooving line 3, a fine grid line laser grooving line 5, a back field main grid connecting line laser grooving line 2 and a back field surrounding edge line laser grooving line 4;
所述椭圆形激光开槽线3朝向圆心方向的内部区域为镂空区1；所述细栅线激光开槽线5与水平线平行；The inner area of the elliptical laser grooving line 3 toward the center of the circle is the hollow area 1; the fine grating laser grooving line 5 is parallel to the horizontal line;
所述细栅线激光开槽线5之间相互平行，背场主栅连接线激光开槽线2之间相互平行，细栅线激光开槽线5和背场主栅连接线激光开槽线2相互垂直，椭圆形激光开槽线3与背场主栅连接线激光开槽线2相交；The fine grid laser grooving lines 5 are parallel to each other, the back field main grid connecting line laser grooving lines 2 are parallel to each other, the fine grid laser grooving lines 5 and the back field main grid connecting line laser grooving lines 2 are perpendicular to each other, and the elliptical laser slotting line 3 intersects with the back field main grid connection line laser slotting line 2;
所述激光开槽线的宽度为2μm，所述激光开槽线的深度为0.1μm；The width of the laser groove line is 2 μm, and the depth of the laser groove line is 0.1 μm;
本实施例所述双面太阳能电池背面激光开槽结构的局部放大示意图如图2所示；A partial enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell in this embodiment is shown in Figure 2;
本实施例同样在细栅线处、镂空区1四周、背场主栅连接线以及背场四周边缘线均设置激光开槽线，能最大程度上降低双面电池串阻，提升效率。In this embodiment, laser slotting lines are also provided at the fine grid lines, around the hollow area 1, the back field main grid connection lines, and around the back field edge lines, which can minimize the series resistance of the double-sided battery and improve efficiency.
实施例3Example 3
本实施例提供了一种如图1所示的双面太阳能电池背面激光开槽结构，所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区1和激光开槽线；This embodiment provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 1. The laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and laser grooving lines;
所述激光开槽线包括椭圆形激光开槽线3、细栅线激光开槽线5、背场主栅连接线激光开槽线2和背场四周边缘线激光开槽线4；The laser grooving line includes an elliptical laser grooving line 3, a fine grid line laser grooving line 5, a back field main grid connecting line laser grooving line 2 and a back field surrounding edge line laser grooving line 4;
所述椭圆形激光开槽线3朝向圆心方向的内部区域为镂空区1；所述细栅线激光开槽线5与水平线平行；The inner area of the elliptical laser grooving line 3 toward the center of the circle is the hollow area 1; the fine grating laser grooving line 5 is parallel to the horizontal line;
所述细栅线激光开槽线5之间相互平行，背场主栅连接线激光开槽线2之间相互平行， 细栅线激光开槽线5和背场主栅连接线激光开槽线2相互垂直，椭圆形激光开槽线3与背场主栅连接线激光开槽线2相交；The fine grid laser grooving lines 5 are parallel to each other, and the back field main grid connection line laser grooving lines 2 are parallel to each other. The fine grid laser grooving line 5 and the back field main grid connecting line laser grooving line 2 are perpendicular to each other, and the elliptical laser grooving line 3 intersects with the back field main grid connecting line laser grooving line 2;
所述激光开槽线的宽度为100μm，所述激光开槽线的深度为2μm；The width of the laser grooving line is 100 μm, and the depth of the laser grooving line is 2 μm;
本实施例所述双面太阳能电池背面激光开槽结构的局部放大示意图如图2所示；A partial enlarged schematic diagram of the laser grooved structure on the back of the double-sided solar cell in this embodiment is shown in Figure 2;
本实施例同样在细栅线处、镂空区1四周、背场主栅连接线以及背场四周边缘线均设置激光开槽线，能最大程度上降低双面电池串阻，提升效率。In this embodiment, laser slotting lines are also provided at the fine grid lines, around the hollow area 1, the back field main grid connection lines, and around the back field edge lines, which can minimize the series resistance of the double-sided battery and improve efficiency.
实施例4Example 4
本实施例提供了一种双面太阳能电池背面激光开槽结构，所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区和激光开槽线；This embodiment provides a laser grooving structure on the back of a double-sided solar cell. The laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas and laser grooving lines;
所述激光开槽线包括椭圆形激光开槽线、细栅线激光开槽线和背场四周边缘线激光开槽线；The laser grooving lines include elliptical laser grooving lines, fine grid line laser grooving lines and back field peripheral edge line laser grooving lines;
所述椭圆形激光开槽线朝向圆心方向的内部区域为镂空区；所述细栅线激光开槽线与水平线平行；The inner area of the elliptical laser grooving line toward the center of the circle is a hollow area; the fine grating laser grooving line is parallel to the horizontal line;
所述细栅线激光开槽线之间相互平行；The fine grating laser grooving lines are parallel to each other;
所述激光开槽线的宽度为50μm，所述激光开槽线的深度为1μm；The width of the laser grooving line is 50 μm, and the depth of the laser grooving line is 1 μm;
本实施例在细栅线处、镂空区四周以及背场四周边缘线均设置激光开槽线，但是未在背场主栅连接线处设置激光开槽线，相较于实施例1的电池效率稍降低。In this embodiment, laser grooving lines are provided at the fine grid lines, around the hollow area, and around the edge lines of the back field, but no laser grooving lines are provided at the back field main grid connection lines. Compared with the battery efficiency of Embodiment 1 Lower slightly.
实施例5Example 5
本实施例提供了一种双面太阳能电池背面激光开槽结构，所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区和激光开槽线；This embodiment provides a laser grooving structure on the back of a double-sided solar cell. The laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas and laser grooving lines;
所述激光开槽线包括椭圆形激光开槽线和细栅线激光开槽线；The laser grooving lines include elliptical laser grooving lines and fine grid laser grooving lines;
所述椭圆形激光开槽线3朝向圆心方向的内部区域为镂空区；所述细栅线激光开槽线与水平线平行；The inner area of the elliptical laser grooving line 3 toward the center of the circle is a hollow area; the fine grating laser grooving line is parallel to the horizontal line;
所述细栅线激光开槽线之间相互平行；The fine grating laser grooving lines are parallel to each other;
所述激光开槽线的宽度为50μm，所述激光开槽线的深度为1μm；The width of the laser grooving line is 50 μm, and the depth of the laser grooving line is 1 μm;
本实施例仅在细栅线处和镂空区四周设置激光开槽线，但是未在背场主栅连接线处和 背场四周边缘线处设置激光开槽线，相较于实施例1的电池效率稍降低。In this embodiment, laser slotting lines are only provided at the fine grid lines and around the hollow area, but not at the back field main grid connection lines and Laser groove lines are provided at the edge lines around the back field, which results in a slightly lower cell efficiency compared to Embodiment 1.
对比例1Comparative example 1
本对比例提供了一种如图4所示的双面太阳能电池背面激光开槽结构，所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区1和细栅线激光开槽线5；This comparative example provides a laser grooving structure on the back of a double-sided solar cell as shown in Figure 4. The laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas 1 and fine grid laser grooving lines 5. ;
所述细栅线激光开槽线5与水平线平行；所述细栅线激光开槽线5之间相互平行；The fine grating laser grooving lines 5 are parallel to the horizontal line; the fine grating laser grooving lines 5 are parallel to each other;
所述激光开槽线的宽度为50μm，所述激光开槽线的深度为1μm；The width of the laser grooving line is 50 μm, and the depth of the laser grooving line is 1 μm;
本对比例仅在细栅线处设置激光开槽线，会造成同质化严重，整体串阻较大，易功率损失的问题，相较于实施例1的电池效率降低。In this comparative example, laser slotting lines are only provided at thin grid lines, which will cause serious homogenization, large overall series resistance, and easy power loss. Compared with Embodiment 1, the battery efficiency is reduced.
综上所述，本申请提供的激光开槽结构，为双面电池背场最优的开槽结构，能够有效改善电流的传输路径，改善欧姆接触，减小串阻，提高电池的短路电流，并优化填充因子，从而提升双面电池的效率。To sum up, the laser slotting structure provided by this application is the optimal slotting structure for the back field of double-sided batteries, which can effectively improve the current transmission path, improve ohmic contact, reduce series resistance, and increase the short-circuit current of the battery. And optimize the fill factor to improve the efficiency of bifacial cells.
在一些实施例中，如前所述，双面太阳能电池背面激光开槽结构包括均匀分布的镂空区1和激光开槽线；激光开槽线包括至少一个环形激光开槽线和至少一个细栅线激光开槽线5，环形激光开槽线朝向环心方向的内部区域为镂空区1；细栅线激光开槽线5与水平线平行。In some embodiments, as mentioned above, the laser grooved structure on the back of the double-sided solar cell includes evenly distributed hollow areas 1 and laser grooved lines; the laser grooved lines include at least one ring-shaped laser grooved line and at least one fine grid. The inner area of the linear laser grooving line 5 and the ring laser grooving line toward the center of the ring is the hollow area 1; the fine grid laser grooving line 5 is parallel to the horizontal line.
本申请双面电池背面不仅在细栅线处激光开槽，还在镂空区1的四周激光开槽，解决仅在细栅线处开槽造成的同质化严重，整体串阻较大，易功率损失的问题，镂空区1的四周激光开槽能改善电流的传输路径，改善欧姆接触，减小串阻，同时提高电池的短路电流。The back of the double-sided battery in this application is not only laser-grooved at the fine grid lines, but also laser-grooved around the hollow area 1, which solves the problem of serious homogenization caused by only slotting at the fine grid lines, and the overall series resistance is large and easy to Regarding the problem of power loss, laser grooves around the hollow area 1 can improve the current transmission path, improve ohmic contact, reduce series resistance, and increase the short-circuit current of the battery.
在一些实施例中，激光开槽线还包括至少一个背场主栅连接线激光开槽线2。In some embodiments, the laser grooving line further includes at least one backfield busbar connection line laser grooving line 2 .
在一些实施例中，激光开槽线还包括背场四周边缘线激光开槽线4。In some embodiments, the laser grooving lines also include backfield peripheral edge line laser grooving lines 4 .
本申请在背场主栅连接线和背场四周边缘线也进行激光开槽，通过多处开槽线间的相互作用，共同配合，能进一步改善欧姆接触，减小串阻，提高电池的短路电流，优化填充因子。This application also performs laser grooves on the back field main grid connection lines and the edge lines around the back field. Through the interaction and cooperation between multiple groove lines, the ohmic contact can be further improved, the series resistance can be reduced, and the short circuit of the battery can be improved. current, optimizing fill factor.
在一些实施例中，环形激光开槽线为椭圆形激光开槽线3。In some embodiments, the ring-shaped laser grooving line is an elliptical laser grooving line 3 .
在一些实施例中，激光开槽线的宽度为约2μm-约100μm，例如可以是2μm、5μm、10μm、20μm、30μm、40μm、50μm、60μm、70μm、80μm、90μm或100μm，但并不仅限 于所列举的数值，该数值范围内其他未列举的数值同样适用。In some embodiments, the laser grooved line has a width of about 2 μm to about 100 μm, such as, but not limited to, 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm. For the numerical values listed, other non-listed values within the numerical range are also applicable.
在一些实施例中，激光开槽线的深度为约0.1μm-约2μm，例如可以是0.1μm、0.3μm、0.5μm、0.7μm、0.9μm、1.0μm、1.2μm、1.4μm、1.6μm、1.8μm或2.0μm，但并不仅限于所列举的数值，该数值范围内其他未列举的数值同样适用。In some embodiments, the depth of the laser grooved line is about 0.1 μm to about 2 μm, for example, it can be 0.1 μm, 0.3 μm, 0.5 μm, 0.7 μm, 0.9 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8μm or 2.0μm, but it is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
与相关技术相比，本申请的有益效果为：Compared with related technologies, the beneficial effects of this application are:
本申请提供的开槽结构，为双面太阳能电池背场最有优的开槽结构，能够解决双面电池串阻较大，易造功率损失等问题，并能够改善电流的传输路径，改善欧姆接触，减小串阻，提高电池的短路电流，优化填充因子，从而提升电池的效率。The slotted structure provided by this application is the most optimal slotted structure for the back field of bifacial solar cells. It can solve the problems of large series resistance of bifacial cells and easy power loss, and can improve the current transmission path and ohm. contact, reduce series resistance, increase the short-circuit current of the battery, and optimize the fill factor, thereby improving the efficiency of the battery.
以上所述仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，所属技术领域的技术人员应该明了，任何属于本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，均落在本申请的保护范围和公开范围之内。 The above are only specific implementation modes of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the technical field should understand that any person skilled in the technical field, within the technical scope disclosed in the present application, Changes or substitutions that can be easily imagined fall within the protection scope and disclosure scope of this application.

Claims (10)

  1. 一种双面太阳能电池背面激光开槽结构，其特征在于，所述双面太阳能电池背面激光开槽结构包括均匀分布的镂空区和激光开槽线；A laser grooving structure on the back of a double-sided solar cell, characterized in that the laser grooving structure on the back of a double-sided solar cell includes evenly distributed hollow areas and laser grooving lines;
    所述激光开槽线包括至少一个环形激光开槽线和至少一个细栅线激光开槽线，所述环形激光开槽线朝向环心方向的内部区域为镂空区；The laser grooving line includes at least one ring-shaped laser grooving line and at least one fine grating laser grooving line, and the inner area of the ring-shaped laser grooving line toward the center of the ring is a hollow area;
    所述细栅线激光开槽线与水平线平行。The fine grating laser groove lines are parallel to the horizontal lines.
  2. 根据权利要求1所述的双面太阳能电池背面激光开槽结构，其特征在于，所述激光开槽线还包括至少一个背场主栅连接线激光开槽线。The laser grooving structure on the back of a double-sided solar cell according to claim 1, wherein the laser grooving line further includes at least one back field main grid connection line laser grooving line.
  3. 根据权利要求1或2所述的双面太阳能电池背面激光开槽结构，其特征在于，所述激光开槽线还包括背场四周边缘线激光开槽线。The laser grooving structure on the back of a double-sided solar cell according to claim 1 or 2, wherein the laser grooving lines further include laser grooving lines around the back field edge lines.
  4. 根据权利要求1所述的双面太阳能电池背面激光开槽结构，其特征在于，两个以上所述细栅线激光开槽线之间相互平行。The laser grooving structure on the back of a double-sided solar cell according to claim 1, wherein two or more fine grid laser grooving lines are parallel to each other.
  5. 根据权利要求2所述的双面太阳能电池背面激光开槽结构，其特征在于，两个以上所述背场主栅连接线激光开槽线之间相互平行。The laser grooving structure on the back of a double-sided solar cell according to claim 2, characterized in that the laser grooving lines of two or more back field main grid connection lines are parallel to each other.
  6. 根据权利要求4或5所述的双面太阳能电池背面激光开槽结构，其特征在于，所述细栅线激光开槽线和背场主栅连接线激光开槽线相互垂直。The laser grooving structure on the back side of a double-sided solar cell according to claim 4 or 5, wherein the fine grid line laser grooving line and the back field main grid connecting line laser grooving line are perpendicular to each other.
  7. 根据权利要求6所述的双面太阳能电池背面激光开槽结构，其特征在于，所述环形激光开槽线与背场主栅连接线激光开槽线相交。The laser grooving structure on the back of a double-sided solar cell according to claim 6, wherein the annular laser grooving line intersects the laser grooving line of the back field main grid connection line.
  8. 根据权利要求1所述的双面太阳能电池背面激光开槽结构，其特征在于，所述环形激光开槽线为椭圆形激光开槽线。The laser grooving structure on the back of a double-sided solar cell according to claim 1, wherein the ring-shaped laser grooving line is an elliptical laser grooving line.
  9. 根据权利要求1所述的双面太阳能电池背面激光开槽结构，其特征在于，所述激光开槽线的宽度为约2μm-约100μm。The laser grooved structure on the back side of a double-sided solar cell according to claim 1, wherein the laser grooved line has a width of about 2 μm to about 100 μm.
  10. 根据权利要求1所述的双面太阳能电池背面激光开槽结构，其特征在于，所述激光开槽线的深度为约0.1μm-约2μm。 The laser grooved structure on the back of a double-sided solar cell according to claim 1, wherein the depth of the laser grooved line is about 0.1 μm to about 2 μm.
PCT/CN2023/080450 2022-03-09 2023-03-09 Laser grooving structure on the back surface of double-sided solar cell WO2023169507A1 (en)

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CN216849951U (en) * 2022-03-09 2022-06-28 天合光能科技(盐城)有限公司 Double-sided solar cell back laser grooving structure
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