CN108215358B - 一种太阳能电池背板及其制备方法 - Google Patents

一种太阳能电池背板及其制备方法 Download PDF

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CN108215358B
CN108215358B CN201810002942.1A CN201810002942A CN108215358B CN 108215358 B CN108215358 B CN 108215358B CN 201810002942 A CN201810002942 A CN 201810002942A CN 108215358 B CN108215358 B CN 108215358B
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张军
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Suzhou Yuanlian Technology Pioneer Park Management Co ltd
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Abstract

本发明提供一种太阳能电池背板及其制备方法。该太阳能电池背板的制备方法包括:1)在第一、第二、第三金属基板中分别形成多个过孔;2)在所述第一、第二、第三金属基板的各自的上表面和下表面分别涂刷粘结剂,并进行干燥处理;3)依次层叠氟树脂外耐候层、第一金属基板、氟树脂‑橡胶复合层、第二金属基板、橡胶‑EVA复合层、第三金属基板以及EVA层;4)进行热压合处理,以得到所述太阳能电池背板。该方法制备的太阳能电池背板具有优异的密封性能、绝缘性能以及散热性能,进而可以提高相应太阳能电池组件的抗PID性能。

Description

一种太阳能电池背板及其制备方法
技术领域
本发明涉及太阳能电池技术领域,特别是涉及一种太阳能电池背板及其制备方法。
背景技术
晶体硅太阳能电池由于效率高、制造工艺成熟而得到广泛的应用。相应的晶体硅太阳能组件通常包括钢化玻璃、胶层、电池片层、胶层以及太阳能电池电池背板,太阳能电池背板位于太阳能电池组件的背面,对电池片起保护和支撑作用,具有可靠的绝缘性、阻水性、耐老化性。现有的太阳能电池背板通常分为两种:一种为涂胶复合式背板膜,在PET聚酯薄膜两面复合氟膜或者EVA胶膜,三层结构,常见的有TPT、TPE、KPK等结构。一种为涂覆背板膜,在PET聚酯薄膜两面涂覆氟树脂,经干燥固化成膜。
潜在电势诱导衰减(PotentialInducedDegradation,PID)是太阳能电池组件的一种特性,指在高温多湿环境下,高电压流经太阳能电池单元便会导致输出下降的现象。然而现有的太阳能电池背板的导热性能相对较差、密封性能相对较差,进而导致其不具备抗PID性能。如何提高太阳能电池背板的导热性能和密封性能,进而提高相应太阳能电池组件的抗PID性能,其引起了人们的广泛关注。
发明内容
本发明的目的是克服上述现有技术的不足,提供一种太阳能电池背板及其制备方法。
为实现上述目的,本发明提出的一种太阳能电池背板的制备方法,包括以下步骤:1)在第一金属基板、第二金属基板以及第三金属基板中分别形成多个过孔;2)在所述第一、第二、第三金属基板的各自的上表面和下表面分别涂刷粘结剂,并进行干燥处理;3)在所述第一金属基板的下表面铺设氟树脂外耐候层,在所述第一金属基板的上表面铺设氟树脂-橡胶复合层,接着在所述氟树脂-橡胶复合层上铺设所述第二金属基板,接着在所述第二金属基板的上表面铺设橡胶-EVA复合层,接着在所述橡胶-EVA复合层上铺设所述第三金属基板,接着在所述第三金属基板的上表面铺设EVA层;4)进行热压合处理,使得所述氟树脂外耐候层、所述氟树脂-橡胶复合层、所述橡胶-EVA复合层以及所述EVA层各自的一部分进入与上述各层分别相邻的金属基板的各个过孔中,以得到所述太阳能电池背板。
作为优选的,所述步骤2)中的所述干燥处理的温度为70-120℃以及时间为50-90秒。
作为优选的,所述步骤4)中的热压合处理的具体工艺为:在100-120℃的温度下,以压力增加速率为每分钟增加1-3Kg/cm2的条件将压力增至15-20Kg/cm2,保持10-20分钟,接着以压力增加速率为每分钟增加4-6Kg/cm2的条件将压力增至40-50Kg/cm2,保持20-30分钟,接着以压力降低速率为4-6Kg/cm2的条件将压力降至15-20Kg/cm2,保持5-10分钟,接着以压力降低速率为1-2Kg/cm2的条件将压力降为0,然后在50-80℃的条件下固化70-100小时,最后冷却至室温。
作为优选的,所述氟树脂外耐候层包括:氟树脂100份,导热纳米颗粒10-20份,玻璃纤维5-10份。
作为优选的,所述氟树脂-橡胶复合层包括:氟树脂60-80份,橡胶60-80份;导热纳米颗粒20-30份;碳纤维10-20份。
作为优选的,所述橡胶-EVA复合层包括:橡胶50-70份,EVA40-60份,导热纳米颗粒10-20份;碳纤维10-15份。
作为优选的,所述EVA层包括:EVA100份,导热绝缘纳米颗粒10-20份,玻璃纤维10-15份。
作为优选的,所述第一、第二、第三金属基板中的多个过孔呈矩阵排列,过孔的直径为3-5毫米,相邻过孔之间的间距为5-10毫米。
本发明还提供了一种太阳能电池背板,所述太阳能电池背板为采用上述方法制备形成的。
本发明的太阳能电池背板包括三个金属基板,且每个金属基板中均具有多个过孔,且在每个金属基板的上下表面的树脂层通过过孔粘结在一起,各树脂层中均具有导热纳米颗粒,且通过优化过孔的直径和间距,提高树脂层与金属板之间的粘结性能,使得该太阳能电池背板具有优异的密封性能、绝缘性能以及散热性能,进而可以提高相应太阳能电池组件的抗PID性能,此外金属基板之间具有氟树脂-橡胶复合层以及所述橡胶-EVA复合层,使得该太阳能电池背板具有优异的抗震性能,有效减少相应太阳能电池组件由于碰撞导致损坏的几率。此外,本发明的制备方法与现有技术相比还具有如下有益效果:通过优化热压合处理工艺,压力采用先逐渐增加压力,并进行阶段性热压处理,然后再逐渐降低压力,使得在整个热压合过程中太阳能电池背板的受力更均匀,进而制备的太阳能电池背板的致密性更高、综合性能更优越,本发明的制备方法简单,易于工业生产。
附图说明
图1为本发明的太阳能电池背板的结构示意图。
图2为本发明的太阳能电池背板中的金属基板的俯视结构图。
具体实施方式
一种太阳能电池背板的制备方法,包括以下步骤:1)在第一金属基板、第二金属基板以及第三金属基板中分别形成多个过孔;2)在所述第一、第二、第三金属基板的各自的上表面和下表面分别涂刷粘结剂,并进行干燥处理;3)在所述第一金属基板的下表面铺设氟树脂外耐候层,在所述第一金属基板的上表面铺设氟树脂-橡胶复合层,接着在所述氟树脂-橡胶复合层上铺设所述第二金属基板,接着在所述第二金属基板的上表面铺设橡胶-EVA复合层,接着在所述橡胶-EVA复合层上铺设所述第三金属基板,接着在所述第三金属基板的上表面铺设EVA层;4)进行热压合处理,使得所述氟树脂外耐候层、所述氟树脂-橡胶复合层、所述橡胶-EVA复合层以及所述EVA层各自的一部分进入与上述各层分别相邻的金属基板的各个过孔中,以得到所述太阳能电池背板。
其中,所述步骤2)中的所述干燥处理的温度为70-120℃以及时间为50-90秒。所述步骤4)中的热压合处理的具体工艺为:在100-120℃的温度下,以压力增加速率为每分钟增加1-3Kg/cm2的条件将压力增至15-20Kg/cm2,保持10-20分钟,接着以压力增加速率为每分钟增加4-6Kg/cm2的条件将压力增至40-50Kg/cm2,保持20-30分钟,接着以压力降低速率为4-6Kg/cm2的条件将压力降至15-20Kg/cm2,保持5-10分钟,接着以压力降低速率为1-2Kg/cm2的条件将压力降为0,然后在50-80℃的条件下固化70-100小时,最后冷却至室温。所述氟树脂外耐候层包括:氟树脂100份,导热纳米颗粒10-20份,玻璃纤维5-10份。所述氟树脂-橡胶复合层包括:氟树脂60-80份,橡胶60-80份;导热纳米颗粒20-30份;碳纤维10-20份。所述橡胶-EVA复合层包括:橡胶50-70份,EVA40-60份,导热纳米颗粒10-20份;碳纤维10-15份。所述EVA层包括:EVA100份,导热绝缘纳米颗粒10-20份,玻璃纤维10-15份。所述第一、第二、第三金属基板中的多个过孔呈矩阵排列,过孔的直径为3-5毫米,相邻过孔之间的间距为5-10毫米,所述第一、第二、第三金属基板的材质优选为铝或铜。
本发明还提供了一种太阳能电池背板,所述太阳能电池背板为采用上述方法制备形成的。如图1-2所示,所述太阳能电池背板包括氟树脂外耐候层1、第一金属基板2、氟树脂-橡胶复合层3、第二金属基板4、橡胶-EVA复合层5、第三金属基板6以及EVA层7,第一金属基板2、第二金属基板4以及第三金属基板6均具有多个过孔8,所述氟树脂外耐候层1、所述氟树脂-橡胶复合层3、所述橡胶-EVA复合层5以及所述EVA层7各自的一部分进入与上述各层分别相邻的金属基板的各个过孔8中,上述各树脂层在各过孔8中相互粘结在一起。
实施例1:
一种太阳能电池背板的制备方法,包括以下步骤:
1)在第一金属基板、第二金属基板以及第三金属基板中分别形成多个过孔,所述第一、第二、第三金属基板中的多个过孔呈矩阵排列,过孔的直径为4毫米,相邻过孔之间的间距为8毫米,所述所述第一、第二、第三金属基板的材质为铝;
2)在所述第一、第二、第三金属基板的各自的上表面和下表面分别涂刷粘结剂,并进行干燥处理,所述干燥处理的温度为100℃以及时间为60秒;
3)在所述第一金属基板的下表面铺设氟树脂外耐候层,在所述第一金属基板的上表面铺设氟树脂-橡胶复合层,接着在所述氟树脂-橡胶复合层上铺设所述第二金属基板,接着在所述第二金属基板的上表面铺设橡胶-EVA复合层,接着在所述橡胶-EVA复合层上铺设所述第三金属基板,接着在所述第三金属基板的上表面铺设EVA层,其中,所述氟树脂外耐候层包括:氟树脂100份,导热纳米颗粒15份,玻璃纤维8份。所述氟树脂-橡胶复合层包括:氟树脂70份,橡胶70份;导热纳米颗粒25份;碳纤维15份。所述橡胶-EVA复合层包括:橡胶60份,EVA50份,导热纳米颗粒15份;碳纤维12份。所述EVA层包括:EVA100份,导热绝缘纳米颗粒15份,玻璃纤维12份;
4)进行热压合处理,热压合处理的具体工艺为:在110℃的温度下,以压力增加速率为每分钟增加2Kg/cm2的条件将压力增至18Kg/cm2,保持15分钟,接着以压力增加速率为每分钟增加5Kg/cm2的条件将压力增至48Kg/cm2,保持25分钟,接着以压力降低速率为5Kg/cm2的条件将压力降至18Kg/cm2,保持7分钟,接着以压力降低速率为2Kg/cm2的条件将压力降为0,然后在70℃的条件下固化80小时,最后冷却至室温,使得所述氟树脂外耐候层、所述氟树脂-橡胶复合层、所述橡胶-EVA复合层以及所述EVA层各自的一部分进入与上述各层分别相邻的金属基板的各个过孔中,上述各树脂层在各过孔中相互粘结在一起,以得到所述太阳能电池背板。
将上述方法制备的太阳能电池背板进行性能测试,结果表明,其与太阳能电池组件EVA胶层的剥离强度为150N/cm,水汽透过率为0.15g/m2*d,导热系数为19.58W/m*k。
实施例2:
一种太阳能电池背板的制备方法,包括以下步骤:
1)在第一金属基板、第二金属基板以及第三金属基板中分别形成多个过孔,所述第一、第二、第三金属基板中的多个过孔呈矩阵排列,过孔的直径为5毫米,相邻过孔之间的间距为5毫米,所述第一、第二、第三金属基板的材质为铜;
2)在所述第一、第二、第三金属基板的各自的上表面和下表面分别涂刷粘结剂,并进行干燥处理,所述干燥处理的温度为80℃以及时间为80秒;
3)在所述第一金属基板的下表面铺设氟树脂外耐候层,在所述第一金属基板的上表面铺设氟树脂-橡胶复合层,接着在所述氟树脂-橡胶复合层上铺设所述第二金属基板,接着在所述第二金属基板的上表面铺设橡胶-EVA复合层,接着在所述橡胶-EVA复合层上铺设所述第三金属基板,接着在所述第三金属基板的上表面铺设EVA层,所述氟树脂外耐候层包括:氟树脂100份,导热纳米颗粒20份,玻璃纤维10份。所述氟树脂-橡胶复合层包括:氟树脂80份,橡胶60份;导热纳米颗粒30份;碳纤20份。所述橡胶-EVA复合层包括:橡胶50份,EVA60份,导热纳米颗粒18份;碳纤维15份。所述EVA层包括:EVA100份,导热绝缘纳米颗粒20份,玻璃纤维15份。;
4)进行热压合处理,热压合处理的具体工艺为:在100℃的温度下,以压力增加速率为每分钟增加1Kg/cm2的条件将压力增至15Kg/cm2,保持20分钟,接着以压力增加速率为每分钟增加6Kg/cm2的条件将压力增至50Kg/cm2,保持20分钟,接着以压力降低速率为4Kg/cm2的条件将压力降至15Kg/cm2,保持10分钟,接着以压力降低速率为2Kg/cm2的条件将压力降为0,然后在60℃的条件下固化90小时,最后冷却至室温,使得所述氟树脂外耐候层、所述氟树脂-橡胶复合层、所述橡胶-EVA复合层以及所述EVA层各自的一部分进入与上述各层分别相邻的金属基板的各个过孔中,上述各树脂层在各过孔中相互粘结在一起,以得到所述太阳能电池背板。
将上述方法制备的太阳能电池背板进行性能测试,结果表明,其与太阳能电池组件EVA胶层的剥离强度为145N/cm,水汽透过率为0.26g/m2*d,导热系数为25.62W/m*k。
以上所述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,还可以做出若干改进和润饰,这些改进和润饰也视为本发明的保护范围。

Claims (9)

1.一种太阳能电池背板的制备方法,其特征在于:包括以下步骤:
1)在第一金属基板、第二金属基板以及第三金属基板中分别形成多个过孔;
2)在所述第一、第二、第三金属基板的各自的上表面和下表面分别涂刷粘结剂,并进行干燥处理;
3)在所述第一金属基板的下表面铺设氟树脂外耐候层,在所述第一金属基板的上表面铺设氟树脂-橡胶复合层,接着在所述氟树脂-橡胶复合层上铺设所述第二金属基板,接着在所述第二金属基板的上表面铺设橡胶-EVA复合层,接着在所述橡胶-EVA复合层上铺设所述第三金属基板,接着在所述第三金属基板的上表面铺设EVA层;
4)进行热压合处理,使得所述氟树脂外耐候层、所述氟树脂-橡胶复合层、所述橡胶-EVA复合层以及所述EVA层各自的一部分进入与上述各层分别相邻的金属基板的各个过孔中,以得到所述太阳能电池背板。
2.根据权利要求1所述的太阳能电池背板的制备方法,其特征在于:所述步骤2)中的所述干燥处理的温度为70-120℃以及时间为50-90秒。
3.根据权利要求2所述的太阳能电池背板的制备方法,其特征在于:所述步骤4)中的热压合处理的具体工艺为:在100-120℃的温度下,以压力增加速率为每分钟增加1-3Kg/cm2的条件将压力增至15-20Kg/cm2,保持10-20分钟,接着以压力增加速率为每分钟增加4-6Kg/cm2的条件将压力增至40-50Kg/cm2,保持20-30分钟,接着以压力降低速率为4-6Kg/cm2的条件将压力降至15-20Kg/cm2,保持5-10分钟,接着以压力降低速率为1-2Kg/cm2的条件将压力降为0,然后在50-80℃的条件下固化70-100小时,最后冷却至室温。
4.根据权利要求1所述的太阳能电池背板的制备方法,其特征在于:所述氟树脂外耐候层包括:氟树脂100份,导热纳米颗粒10-20份,玻璃纤维5-10份。
5.根据权利要求1所述的太阳能电池背板的制备方法,其特征在于:所述氟树脂-橡胶复合层包括:氟树脂60-80份,橡胶60-80份;导热纳米颗粒20-30份;碳纤维10-20份。
6.根据权利要求1所述的太阳能电池背板的制备方法,其特征在于:所述橡胶-EVA复合层包括:橡胶50-70份,EVA40-60份,导热纳米颗粒10-20份;碳纤维10-15份。
7.根据权利要求1所述的太阳能电池背板的制备方法,其特征在于:所述EVA层包括:EVA100份,导热绝缘纳米颗粒10-20份,玻璃纤维10-15份。
8.根据权利要求1所述的太阳能电池背板的制备方法,其特征在于:所述第一、第二、第三金属基板中的多个过孔呈矩阵排列,过孔的直径为3-5毫米,相邻过孔之间的间距为5-10毫米。
9.一种太阳能电池背板,其特征在于,采用权利要求1-8任一项所述的方法制备形成的。
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