CN106549073A - 一种用于光伏太阳能电池层压的薄膜组件 - Google Patents
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Abstract
本发明公开一种用于光伏太阳能电池层压的薄膜组件,包括位于电池片上部的上层PVB薄膜和位于电池片底部的底层PVB薄膜,所述底层PVB薄膜上设置有电池安装槽,所述安装槽之间设置有汇流条安装凹槽。本发明组件由于凹槽膜减少了层压过程中薄膜的变形量,电池片破损率和充填不良的发生率大大下降,可以大幅度提高双玻组件的成品率。采用此种凹槽薄膜能够有效固定电池片及汇流条,减少电池片移位承压而破损开裂、防止汇流条脱焊等质量问题的发生,提高组件封装成品率,还可以进一步减薄薄膜的厚度,降低组件重量。
Description
技术领域
本发明属于PVB膜生产加工技术领域,具体涉及一种用于光伏太阳能电池层压的薄膜组件。
背景技术
光伏太阳能电池片不能直接暴露在阳光、雨水等自然条件下,因此有必要对其进行密封保护。目前使用的封装材料为单层结构的乙烯- 醋酸乙烯酯共聚物(EVA),在长期的高温高湿环境下,EVA 容易水解破坏,导致EVA 与玻璃界面的粘结性明显下降,造成太阳能电池组件存在安全隐患。另外一种就是聚乙烯醇缩丁醛(PVB)是一种柔顺性好、透明度高、粘接力强、耐候性强、成膜性好,耐冲击性优异的材料,对玻璃、金属、木材等材料都具有较好的粘接性能,PVB用于太阳能电池封装材料,其抗紫外、抗穿透、与玻璃粘接力以及存放时间都要优于乙烯-醋酸乙烯酯共聚物(EVA),但在双玻组件和薄膜电池组件层压过程中,由于电池片本身自有一定的厚度,经常发生膜片填充不充分、过度挤压损坏电池片的问题。
发明内容
有鉴于此,有必要提供一种用于光伏太阳能电池层压的薄膜组件,以克服现有技术中在薄膜层压过程中经常发生膜片填充不充分、过度挤压损坏电池片的技术问题。
本发明提供一种用于光伏太阳能电池层压的薄膜组件,包括位于电池片底部的底层PVB薄膜和位于电池片上部的上层PVB薄膜,所述底层PVB薄膜上设置有电池安装槽,所述安装槽之间设置有汇流条安装凹槽。
进一步的,所述电池片安装槽均匀分布于底层PVB薄膜上,其深度为0.1-0.35mm,优选0.15-0.25mm;所述电池片安装槽侧壁向电池外侧倾斜,倾斜角度α为5-30°,优选8-15°。
所述汇流条安装凹槽底部为方形或圆弧形,其深度为0.1-0.35mm,优选0.1-0.15mm。
本发明中所述上层PVB薄膜为平面薄膜,表面粗糙度为Rz50-100µm。
本发明将薄膜原料经由模具挤出成片后,在经由带有凸模形式的辊轮挤压出具有凹槽形状膜片。该工艺方法由于凹槽膜而减少了层压过程中薄膜的变形量,电池片破损率和充填不良的发生率都将大大下降,可以大幅度提高双玻组件的成品率。采用此种凹槽薄膜能够有效固定电池片及汇流条,减少电池片移位承压而破损开裂、防止汇流条脱焊等质量问题的发生,提高组件封装成品率。还可以进一步减薄薄膜的厚度,降低组件重量。
附图说明
图1:本发明的一种薄膜组件压制的太能电池板的结构示意图;
图2:本发明的薄膜组件中底层凹槽膜的俯视图;
图3:本发明的薄膜组件中底层凹槽膜的侧视图;
图4:本发明的薄膜组件中底层凹槽膜的I位置局部放大图。
具体实施方式
下面结合附图对本发明的实施方式作进一步描述
参见图1-4,本发明首先对PVB薄膜原料经由模具挤出成片后,再经由带有凸模形式的辊轮挤压出具有凹槽形状底层PVB薄膜2。所述底层PVB薄膜2上设置有电池安装槽21,所述电池片安装槽21均匀分布于底层PVB薄膜2上,其深度为0.1-0.35mm,优选0.15-0.25mm。其长度和宽度与光伏电池片尺寸相对应,从而平稳固定电池片。进一步的,所述电池片安装槽21侧壁向电池外侧倾斜,倾斜角度α为5-30°,优选8-15°。采用斜角过度的方式,方便光伏电池片的置入及后续层压加工的填充。
所述电池安装槽21之间还设置有汇流条安装凹槽22,所述汇流条安装凹槽22底部为方形或圆弧形,其深度为0.1-0.35mm,优选0.1-0.15mm 。汇流条安装凹槽22的深度小于电池片安装槽21的深度,可以较好固定汇流条并方便焊接。
本发明中所述上层PVB薄膜1为平面薄膜,表面粗糙度为Rz50-100µm。
本发明的太阳能光伏电池组件封装加工时,将此具有凹槽形状底层PVB薄膜2按所需尺寸裁切好平铺在背板玻璃(图中未示出)上,将电池片嵌放入电池安装槽21,并装焊好汇流条,所述汇流条固定在汇流条安装凹槽22中。再铺装上层PVB薄膜1。之后采用常规的真空排气法或滚压层压法继续后序加工,即可完成光伏太阳能电池板的封装。
本发明的光伏太阳能电池层压的薄膜组件,采用两种不同形式的PVB薄膜相互配合使用,上层PVB薄膜为平面薄膜,且具有较好的粗糙度有利于加工压制过程中排气,底层薄膜采用凹槽形式,采用此种凹槽薄膜进行层压加工时由于薄膜的变形较常规膜要小,能够减少电池片破损开裂、防止汇流条脱焊等质量问题的发生,提高组件封装成品率。此外,凹槽形式的薄膜也有利于太阳能电池元件在封装工艺中易于操作和抽真空,同时还能进一步减薄薄膜的厚度,降低光伏太阳能电池组件重量。
可以理解的,本发明不限于上述实施例,本领域技术人员还可在本发明精神内做其它变化。因此,这些依据本发明精神所做的变化,都应包含在本发明所要求保护的范围之内。
Claims (8)
1.一种用于光伏太阳能电池层压的薄膜组件,包括位于电池片底部的底层PVB薄膜和位于电池片上部的上层PVB薄膜,其特征在于:所述底层PVB薄膜上设置有电池安装槽,所述安装槽之间设置有汇流条安装凹槽。
2.如权利要求1所述用于光伏太阳能电池层压的薄膜组件,其特征在于:所述电池片安装槽均匀分布于底层PVB薄膜上,其深度为0.1-0.35mm。
3.如权利要求2所述用于光伏太阳能电池层压的薄膜组件,其特征在于:所述电池片安装槽的深度为0.15-0.25mm。
4.如权利要求1所述用于光伏太阳能电池层压的薄膜组件,其特征在于:所述电池片安装槽侧壁向电池外侧倾斜,倾斜角度α为5-30°。
5.如权利要求4所述用于光伏太阳能电池层压的薄膜组件,其特征在于:所述电池片安装槽侧壁倾斜角度α为8-15°。
6.如权利要求1所述用于光伏太阳能电池层压的薄膜组件,其特征在于:所述汇流条安装凹槽底部为方形或圆弧形,其深度为0.1-0.35mm。
7.如权利要求6所述用于光伏太阳能电池层压的薄膜组件,其特征在于:所述汇流条安装凹槽的深度为0.1-0.15mm。
8.如权利要求1至8中任意一项所述用于光伏太阳能电池层压的薄膜组件,其特征在于:所述上层PVB薄膜为平面薄膜,表面粗糙度为Rz50-100µm。
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CN206516643U (zh) * | 2017-01-10 | 2017-09-22 | 江苏朗杰膜科技有限公司 | 一种用于光伏太阳能电池层压的薄膜组件 |
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CN202009005U (zh) * | 2011-04-18 | 2011-10-12 | 常州中弘光伏有限公司 | 一种光伏组件用eva胶膜 |
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