CN113299795A - 一种原料油污电池片的表面织构清洗工艺 - Google Patents
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Abstract
本发明涉及太阳能电池片制绒领域。一种原料油污电池片的表面织构清洗工艺,包括在单晶制绒前两步碱性腐蚀液清洗步骤,碱性腐蚀液第一次清洗步骤,高浓度碱液快速清洗;碱性腐蚀液第二次清洗步骤,中浓度碱液和双氧水混合溶液慢速清洗。本发明通过在预清洗后采用两步碱洗的步骤,能够有效清除电池片上沾染的油污,在制绒完成后再次通过碱洗和酸洗能够彻底洗去油污,有效降低了后续产线的EL黑斑比例,且转换效率较原制绒工艺提高0.02%‑0.04%。
Description
技术领域
本发明涉及太阳能电池片制绒领域。
背景技术
近年,国家严控环境污染,光伏优势日益凸显,政府制定多项举措扶持光伏行业,旨在应对全球气候变化。在光伏行业发展进程中,PERC电池量产及转换效率逐年攀升。在其产业化的技术竞争引起了行业的广泛关注,导致产业化的设备、原材料、辅材的加速开发。各生产企业,为应对市场供求,同时为稳定企业生存与发展,在满足生产订单的前提下,对不合格片的返工合格率做全线调整,以增加企业输出降低成本损耗。制绒工艺为晶硅电池片的第一道工序,其工艺质量对后续工艺起着关键作用。原料电池片的制作时,由于切割时不可避免会造成油污沾染,该类油污片肉眼可视,且在单晶制绒碱槽中难以去除掉,流通到下线会出现EL黑斑,造成产线合格率下降。在产业化的生产中,油污片会集中进行生产以减轻产线工作、降低EL不良、提升整线合格率。
发明内容
本发明所要解决的技术问题,如何解决沾染油污的电池片在制绒过程中不易清除干净,造成电池片合格率下降问题。
本发明所采用的技术方案是:一种原料油污电池片的表面织构清洗工艺,包括在单晶制绒前两步碱性腐蚀液清洗步骤
碱性腐蚀液第一次清洗步骤,高浓度碱液快速清洗;
碱性腐蚀液第二次清洗步骤,中浓度碱液和双氧水混合溶液慢速清洗。
需要说明的是:本发明中碱性腐蚀液第一次清洗步骤前已经完成了对原料油污电池片进行水洗、酸洗、碱洗等粗洗或者预清洗的步骤,硅片切割后完成了预清洗后再采用本专利步骤进行清洗和制绒。
高浓度碱液快速清洗是指,在65-75℃,采用氢氧化钾体积分数为1.7%-1.8%的氢氧化钾水溶液清洗80s,配置氢氧化钾水溶液时使用的原液质量分数45%。
低浓度碱液和双氧水混合溶液慢速清洗是指,在65-75℃,采用氢氧化钾体积分数为1.3%-1.4%、双氧水体积分数为5%-6%的氢氧化钾水溶液清洗130s,配置氢氧化钾水溶液时使用的原液质量分数为45%。还包括单晶制绒后,碱性腐蚀液第三次清洗的步骤和酸性腐蚀液清洗的步骤
碱性腐蚀液第三次清洗步骤,低浓度碱液和双氧水混合溶液慢速清洗;
酸性腐蚀液清洗步骤,混合酸清洗。
碱性腐蚀液第三次清洗步骤和酸性腐蚀液清洗步骤之间进行水洗;
碱性腐蚀液第三次清洗步骤是指,在65-75℃,采用氢氧化钾体积分数为0.7%-0.8%、双氧水体积分数为2%-3%的氢氧化钾水溶液清洗120s,配置氢氧化钾水溶液时使用的原液质量分数为45%。酸性腐蚀液清洗步骤是指,在常温下,采用氢氟酸体积分数为6%-7%,盐酸体积分数为5%-6%的混合酸水溶液清洗120s,氢氟酸原液质量分数为48%,盐酸原液质量分数为36%。
单晶制绒采用碱制绒。
本发明的有益效果是:本发明通过在预清洗后采用两步碱洗的步骤,能够有效清除电池片上沾染的油污,在制绒完成后再次通过碱洗和酸洗能够彻底洗去油污,
有效降低了后续产线的EL黑斑比例,且转换效率较原制绒工艺提高0.02%-0.04%。
具体实施方式
碱性腐蚀液第一次清洗:在70℃左右的氢氧化钾与纯水的混合液中清洗80s,氢氧化钾的体积分数为1.7%-1.8%,按批补液,每100pcs补0.7L的KOH、2L的纯水,氢氧化钾水溶液时使用的原液质量分数45%。
2、碱性腐蚀液第二次清洗:在70℃的氢氧化钾、H202和纯水的混合液中清洗130s,氢氧化钾的体积分数为1.3%-1.4%,双氧水的体积分数为5%-6%,按批补液;氢氧化钾水溶液时使用的原液质量分数45%。
3、水洗:常温下水洗90s;
4、单晶碱制绒:在78℃左右的氢氧化钾、制绒添加剂和纯水的混合液中制绒440s,氢氧化钾的体积分数为2%-3%,制绒添加剂的体积分数为0.4%-0.5%,按批补液;氢氧化钾水溶液时使用的原液质量分数45%。
5、水洗:常温下水洗90s;
6、碱性腐蚀液第三次清洗:在70℃的氢氧化钾、H202和纯水的混合液中清洗120s,氢氧化钾的体积分数为0.7%-0.8%,双氧水的体积分数为2%-3%,按批补液;氢氟酸原液质量分数为48%,盐酸原液质量分数为36%。
7、水洗:常温下水洗90s;
8、酸性腐蚀液清洗:常温下在HF、HCl和纯水的混合液中清洗120s,HF的体积分数为6%-7%,HCl的体积分数为5%-6%,按批补液;
9、水洗:常温下水洗90s;
制绒工艺是在槽式设备中进行,制绒过程中化学槽按批进行补液,且按批定排,以保证溶液的浓度,进而保证溶液的活性。
采用此制绒工艺与改变原工艺条件,制绒后不良率对比如下:
原工艺条件1是制绒前一次碱洗温度升高且碱洗时间延长;原工艺条件2是提高刻蚀量。
新工艺条件下在源头即控制了产线的不良率。
新旧工艺电性能参数对比:
新工艺条件下制备的电池片性能略优于旧工艺电池片。综合考虑产线良率以及电性能,新工艺更适宜于原料油污片的清洗制绒。
Claims (8)
1.一种原料油污电池片的表面织构清洗工艺,其特征在于:包括在单晶制绒前两步碱性腐蚀液清洗步骤
碱性腐蚀液第一次清洗步骤,高浓度碱液快速清洗;
碱性腐蚀液第二次清洗步骤,中浓度碱液和双氧水混合溶液慢速清洗。
2.根据权利要求1所述的一种原料油污电池片的表面织构清洗工艺,其特征在于:高浓度碱液快速清洗是指,在65-75℃,采用氢氧化钾体积分数为1.7%-1.8%的氢氧化钾水溶液清洗80s,配置氢氧化钾水溶液时使用的原液质量分数45%。
3.根据权利要求1所述的一种原料油污电池片的表面织构清洗工艺,其特征在于:低浓度碱液和双氧水混合溶液慢速清洗是指,在65-75℃,采用氢氧化钾体积分数为1.3%-1.4%、双氧水体积分数为5%-6%的氢氧化钾水溶液清洗130s,配置氢氧化钾水溶液时使用的原液质量分数为45%。
4.根据权利要求1所述的一种原料油污电池片的表面织构清洗工艺,其特征在于:还包括单晶制绒后,碱性腐蚀液第三次清洗的步骤和酸性腐蚀液清洗的步骤
碱性腐蚀液第三次清洗步骤,低浓度碱液和双氧水混合溶液慢速清洗;
酸性腐蚀液清洗步骤,混合酸清洗。
5.根据权利要求4所述的一种原料油污电池片的表面织构清洗工艺,其特征在于:碱性腐蚀液第三次清洗步骤和酸性腐蚀液清洗步骤之间进行水洗。
6.根据权利要求4或者权利要求5所述的一种原料油污电池片的表面织构清洗工艺,其特征在于:碱性腐蚀液第三次清洗步骤是指,在65-75℃,采用氢氧化钾体积分数为0.7%-0.8%、双氧水体积分数为2%-3%的氢氧化钾水溶液清洗120s,配置氢氧化钾水溶液时使用的原液质量分数为45%。
7.根据权利要求4或者权利要求5所述的一种原料油污电池片的表面织构清洗工艺,其特征在于:酸性腐蚀液清洗步骤是指,在常温下,采用氢氟酸体积分数为6%-7%,盐酸体积分数为5%-6%的混合酸水溶液清洗120s,氢氟酸原液质量分数为48%,盐酸原液质量分数为36%。
8.根据权利要求1所述的一种原料油污电池片的表面织构清洗工艺,其特征在于:单晶制绒采用碱制绒。
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