CN111987171A - 一种mwt电池片及其丝网印刷方法 - Google Patents
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Abstract
本发明公开一种MWT电池片及其丝网印刷方法,MWT电池片包括硅片;所述硅片背面设有背铝浆料制成的铝背场和背银浆料制成的背面电极点;所述硅片上开有多个通孔;所述通孔内填充有堵孔浆料;所述通孔对应的硅片正面正银浆料形成的正面电极;所述通孔对应的硅片背面设有背银浆料制成的背面电极点。所述MWT电池片的硅片双面镀膜之后,将硅片背面进行激光开槽;将堵孔浆料从硅片正面印刷至通孔内;然后从硅片背面印刷背银浆料,用于形成背面电极点。本发明大大降低堵孔浆料的开发难度。同时还可以降低堵孔浆料的用量,降低电池成本。
Description
技术领域
本发明涉及一种MWT电池片及其丝网印刷方法,属于光伏电池生产技术领域。
背景技术
现有MWT电池的结构特征,如图1所示,电池片上均匀分布N×N个孔,孔内填充堵孔浆料,正面电极收集电流后通过堵孔浆料传导到背面。堵孔浆料在背面和背面电场隔离,以达到电池正负极绝缘。同时堵孔浆料在制作组件的时候,直接和导电胶结合。因此,堵孔浆料要满足以下要求:①传导电流,浆料要具有良好的导电性;②作为电池负电极和导电胶结合,要求导电胶对堵孔浆料具有浸润性;③堵孔浆料要具有弱腐蚀性,在孔洞及背面都不能烧穿氮化硅膜,以防正负极联通产生严重漏电;④要求堵孔浆料和背膜之间有足够的附着力,以保证可靠性。
以上的要求使得堵孔浆料的开发难度极大,目前只有一家外商可以提供成熟产品,国产浆料厂商开发困难,导致浆料价格居高不下,电池成本相应偏高。
发明内容
发明目的:针对现有技术中存在的问题与不足,本发明提供一种MWT电池片及其丝网印刷方法。通过改进现有印刷方式,将上述堵孔浆料要求②、④规避掉,只要求堵孔浆料具有优良的导电性和弱腐蚀性即可,大大降低浆料的开发难度,推动浆料的国产化。从而降低电池成本。原来②、④要求由背银浆料承担,而背银浆料天然满足②、④的要求。
技术方案:一种MWT电池片,包括硅片;所述硅片背面设有背铝浆料制成的铝背场和背银浆料制成的背面电极点;所述硅片上开有多个通孔;所述通孔内填充有堵孔浆料;所述通孔对应的硅片正面正银浆料形成的正面电极;所述通孔对应的硅片背面设有背银浆料制成的背面电极点。
一种MWT电池片的丝网印刷方法,所述MWT电池片的硅片双面镀膜之后,将硅片背面进行激光开槽;将堵孔浆料从硅片正面印刷至通孔内;然后从硅片背面印刷背银浆料;与原有不同的是堵孔位置也同时印刷背银浆料,用于形成背面电极点。
所述硅片经过激光开槽后,利用自动翻转轴翻转硅片,使硅片正面向上,通过丝网印刷的方式印刷堵孔浆料到硅片的通孔内。
所述硅片印刷过堵孔浆料后,将硅片过烘干箱烘干,然后利用自动翻转轴翻转硅片,使硅片背面向上,印刷背面电极点和通孔对应的背银浆料,然后经烘干箱烘干,印刷背铝浆料;再次烘干。
将印刷过背铝浆料的硅片过烘干箱烘干后,利用自动翻转轴翻转硅片,使硅片正面向上,印刷正银浆料,然后烘干。
所述印刷过正银浆料的硅片烘干后,再依次经过烧结、测试、分选过程。
有益效果:与现有技术相比,本发明所提供的种MWT电池片及其丝网印刷方法,与原有产品相比,改变印刷方式后,堵孔浆料只要起一个传输电流的作用,同时具有弱腐蚀性即可。这样大大降低堵孔浆料的开发难度。同时还可以降低堵孔浆料的用量,正好可以抵消背面增加的背银用量。降低堵孔浆料开发难度,可以推动堵孔浆料的国产化,最终降低电池成本。
附图说明
图1为现有技术中MWT电池片的截面结构示意图;
图2为本发明实施例中MWT电池片的截面结构示意图;
图中,1、背铝浆料, 2、背银浆料,3、堵孔浆料,4、硅片背面,5、硅片正面,6、正银浆料。
具体实施方式
下面结合附图和具体实施例,进一步阐明本发明。
如图2所示,MWT电池片,包括硅片;硅片背面4设有背铝浆料1制成的铝背场和背银浆料2制成的背面电极点;硅片上开有多个通孔;通孔内填充有堵孔浆料3;通孔对应的硅片正面5设有正银浆料6形成的正面电极;通孔对应的硅片背面4设有背银浆料2制成的背面电极点。
MWT电池片的丝网印刷方法,MWT电池片的硅片双面镀膜之后,将硅片背面4进行激光开槽;将堵孔浆料3从硅片正面5印刷至通孔内;然后从硅片背面4印刷背银浆料2;与原有不同的是堵孔位置也同时印刷背银浆料2,用于形成背面电极点。
硅片经过激光开槽后,利用自动翻转轴翻转硅片,使硅片正面5向上,通过丝网印刷的方式印刷堵孔浆料3到硅片的通孔内。
硅片印刷过堵孔浆料3后,将硅片过烘干箱烘干,然后利用自动翻转轴翻转硅片,使硅片背面4向上,印刷背面电极点和通孔对应的背银浆料2,然后经烘干箱烘干,印刷背铝浆料1;再次烘干。
将印刷过背铝浆料1的硅片过烘干箱烘干后,利用自动翻转轴翻转硅片,使硅片正面5向上,印刷正银浆料6,然后烘干。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以作出若干改进,这些改进也应视为本发明的保护范围。
Claims (5)
1.一种MWT电池片,包括硅片;所述硅片背面设有背铝浆料制成的铝背场和背银浆料制成的背面电极点;所述硅片上开有多个通孔;所述通孔内填充有堵孔浆料;所述通孔对应的硅片正面设有正银浆料形成的正面电极;其特征在于:所述通孔对应的硅片背面设有背银浆料制成的背面电极点。
2.一种MWT电池片的丝网印刷方法,其特征在于:所述MWT电池片的硅片双面镀膜之后,将硅片背面进行激光开槽;将堵孔浆料从硅片正面印刷至通孔内;然后从硅片背面印刷背银浆料,用于形成背面电极点。
3.根据权利要求2所述的MWT电池片的丝网印刷方法,其特征在于:所述硅片经过激光开槽后,利用自动翻转轴翻转硅片,使硅片正面向上,通过丝网印刷的方式印刷堵孔浆料到硅片的通孔内。
4.根据权利要求2所述的MWT电池片的丝网印刷方法,其特征在于:所述硅片印刷过堵孔浆料后,将硅片过烘干箱烘干,然后利用自动翻转轴翻转硅片,使硅片背面向上,印刷背面电极点和通孔对应的背银浆料,然后经烘干箱烘干,印刷背铝浆料;再次烘干。
5.根据权利要求2所述的MWT电池片的丝网印刷方法,其特征在于:将印刷过背铝浆料的硅片过烘干箱烘干后,利用自动翻转轴翻转硅片,使硅片正面向上,印刷正银浆料,然后烘干。
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