CN110504333A - 一种适用于薄片perc电池的“z”字图形开槽结构 - Google Patents

一种适用于薄片perc电池的“z”字图形开槽结构 Download PDF

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CN110504333A
CN110504333A CN201910889594.9A CN201910889594A CN110504333A CN 110504333 A CN110504333 A CN 110504333A CN 201910889594 A CN201910889594 A CN 201910889594A CN 110504333 A CN110504333 A CN 110504333A
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眭山
张鹏
陈坤
王璞
王岚
苏荣
李忠涌
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Tongwei Solar Anhui Co Ltd
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Abstract

本发明公开了一种适用于薄片PERC电池的“Z”字图形开槽结构,包括硅基体,设于硅基体背面的钝化膜以及设于钝化膜上的开槽线,所述开槽线包括若干等间距排布的水平激光槽以及若干等间距排布的垂直激光槽,所述水平激光槽和垂直激光槽的长度相等,水平激光槽和垂直激光槽首尾相连形成“Z”型结构的槽线,钝化膜表面等距排布有多条开槽线。本发明PERC太阳电池的背面钝化膜开槽结构,电池背面铝浆与硅片接触良好,电池效率保持稍有提升,更多体现在开压和填充有增加,特别是对于薄硅片,此开槽图形电池碎率减少,翘曲度降低。

Description

一种适用于薄片PERC电池的“Z”字图形开槽结构
技术领域
本发明涉及光伏电池技术领域,具体为一种适用于薄片PERC电池的“Z”字图形开槽结构。
背景技术
提高太阳电池效率和降低成本是光伏发展的两大主题,常规铝背场由于背面复合严重,进一步提升效率非常有限,而在背面镀层钝化膜,能极大降低背表面复合,提高少子寿命,电池效率大提升。
钝化膜不导电绝缘,背面是铝浆,需要对背面钝化膜开槽引出电流,开槽图形的设计对电池电性能影响很大,现有技术中,申请号为“201621361451.9”的一种背钝化太阳电池的背面钝化膜开槽结构,包括硅基体,如说明书附图1所示,设于硅基体背面的钝化膜以及设于钝化膜上的开槽,所述钝化膜上还设有呈阵列分布的矩形区域,所述开槽设置在所述矩形区域的外部,所述开槽包括水平开槽和与所述水平开槽相垂直设置的垂直开槽,所述水平开槽为多条且相邻两条水平开槽之间相互平行并间隔相同设置,所述垂直开槽也为多条且相邻两条垂直开槽之间相互平行并间隔相同设置,所述水平开槽和所述垂直开槽不相接触。但是上述该背面钝化膜开槽结构对于薄片而言,开槽设计不合理,更会导致更多碎片,电池片翘曲度也会更高。
所以需要设计一种新的PERC太阳电池背面钝化开槽结构,特别是对于薄片,可以减少碎片,翘曲度降低。
发明内容
本发明的目的在于提供一种适用于薄片PERC电池的“Z”字图形开槽结构,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:
一种适用于薄片PERC电池的“Z”字图形开槽结构,包括硅基体,设于硅基体背面的钝化膜以及设于钝化膜上的开槽线,所述开槽线包括若干等间距排布的水平激光槽以及若干等间距排布的垂直激光槽,所述水平激光槽和垂直激光槽的长度相等,水平激光槽和垂直激光槽首尾相连形成“Z”型结构的槽线,钝化膜表面等距排布有多条开槽线。
优选的,所述钝化膜表面还设有呈阵列分布的背电极,背电极为矩形结构。
优选的,所述背电极的矩形结构排布方式为5×4方阵,每个矩形结构区域的长度为15-30mm,宽度为1.2-4mm。
优选的,所述水平激光槽等距离线段间隔分布,相邻水平激光槽垂直距离相等、且线断交错等距离分开分布;所述垂直激光槽等距离线段间隔分布,相邻垂直激光槽垂直距离相等、且线断交错等距离分开分布。
优选的,所述水平激光槽线段之间的间距为0.5-2.5mm;垂直激光槽线段之间的间距为0.5-2.5mm。
优选的,所述水平激光槽和所述垂直激光槽外部靠近所述硅基体的边缘处设有方形框激光槽,并且方形框激光槽与相邻靠近的水平激光槽和垂直激光槽相接触。
与现有技术相比,本发明的有益效果是:
本发明的PERC太阳电池的背面钝化膜开槽结构,电池背面铝浆与硅片接触良好,电池效率保持稍有提升,更多体现在开压和填充有增加,特别是对于薄硅片,此开槽图形电池碎率减少,翘曲度降低。
附图说明
图1为现有技术背面钝化膜开槽结构示意图;
图2为本发明的背面钝化膜开槽结构示意图。
图中:1硅基体、2钝化膜、3开槽线、31水平激光槽、32垂直激光槽、4背电极、5方形框激光槽。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1-2,本发明提供一种技术方案:
一种适用于薄片PERC电池的“Z”字图形开槽结构,包括硅基体1,设于硅基体1背面的钝化膜2以及设于钝化膜2上的开槽线3,开槽线3包括若干等间距排布的水平激光槽31以及若干等间距排布的垂直激光槽32,水平激光槽31和垂直激光槽32的长度相等,水平激光槽31和垂直激光槽32首尾相连形成“Z”型结构的槽线,钝化膜2表面等距排布有多条开槽线3。
在背面钝化膜2上开槽的目的是后续印刷背面铝浆有利于引出电流,减少接触电阻,对电池效率有明显提升,其中背面的钝化膜2是由氧化铝和氮化硅组成的双层膜结构。
钝化膜2表面还设有呈阵列分布的背电极4,背电极4为矩形结构,背电极4的矩形结构排布方式为5×4方阵,每个矩形结构区域的长度为15-30mm,宽度为1.2-4mm。
因背面的钝化膜2是绝缘的,水平激光槽31和垂直激光槽32的作用是钝化发射极及背局域接触电池PERC铝浆与硅基体1直接接触,利于引出电流,减少接触电阻,增加开路电压。
水平激光槽31等距离线段间隔分布,相邻水平激光槽31垂直距离相等、且线断交错等距离分开分布;垂直激光槽32等距离线段间隔分布,相邻垂直激光槽32垂直距离相等、且线断交错等距离分开分布,电池背面铝浆与硅基体1接触良好,电池效率保持稍有提升,更多体现在开压和填充有增加,特别是对于薄硅片,此开槽图形电池碎率减少,翘曲度降低。
水平激光槽31线段之间的间距为0.5-2.5mm;垂直激光槽32线段之间的间距为0.5-2.5mm,可以更加有利于电流导出、收集,减少背面复合、增加开路电压。
水平激光槽31和垂直激光槽32外部靠近硅基体1的边缘处设有方形框激光槽5,并且方形框激光槽5与相邻靠近的水平激光槽31和垂直激光槽32相接触,方形框激光槽5的设置,可以更加有利于吸收硅基体1边缘处的电流。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。

Claims (6)

1.一种适用于薄片PERC电池的“Z”字图形开槽结构,包括硅基体(1),设于硅基体(1)背面的钝化膜(2)以及设于钝化膜(2)上的开槽线(3),所述开槽线(3)包括若干等间距排布的水平激光槽(31)以及若干等间距排布的垂直激光槽(32),其特征在于:所述水平激光槽(31)和垂直激光槽(32)的长度相等,水平激光槽(31)和垂直激光槽(32)首尾相连形成“Z”型结构的槽线,钝化膜(2)表面等距排布有多条开槽线(3)。
2.根据权利要求1所述的一种适用于薄片PERC电池的“Z”字图形开槽结构,其特征在于:所述钝化膜(2)表面还设有呈阵列分布的背电极(4),背电极(4)为矩形结构。
3.根据权利要求2所述的一种适用于薄片PERC电池的“Z”字图形开槽结构,其特征在于:所述背电极(4)的矩形结构排布方式为5×4方阵,每个矩形结构区域的长度为15-30mm,宽度为1.2-4mm。
4.根据权利要求1所述的一种适用于薄片PERC电池的“Z”字图形开槽结构,其特征在于:所述水平激光槽(31)等距离线段间隔分布,相邻水平激光槽(31)垂直距离相等、且线断交错等距离分开分布;所述垂直激光槽(32)等距离线段间隔分布,相邻垂直激光槽(32)垂直距离相等、且线断交错等距离分开分布。
5.根据权利要求4所述的一种适用于薄片PERC电池的“Z”字图形开槽结构,其特征在于:所述水平激光槽(31)线段之间的间距为0.5-2.5mm;垂直激光槽(32)线段之间的间距为0.5-2.5mm。
6.根据权利要求1所述的一种适用于薄片PERC电池的“Z”字图形开槽结构,其特征在于:所述水平激光槽(31)和所述垂直激光槽(32)外部靠近所述硅基体(1)的边缘处设有方形框激光槽(5),并且方形框激光槽(5)与相邻靠近的水平激光槽(31)和垂直激光槽(32)相接触。
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