CN104854712B - 共挤太阳能板背膜 - Google Patents
共挤太阳能板背膜 Download PDFInfo
- Publication number
- CN104854712B CN104854712B CN201380049960.0A CN201380049960A CN104854712B CN 104854712 B CN104854712 B CN 104854712B CN 201380049960 A CN201380049960 A CN 201380049960A CN 104854712 B CN104854712 B CN 104854712B
- Authority
- CN
- China
- Prior art keywords
- layer
- notacoria
- polyamide
- plate
- photovoltaic solar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
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- RORFESPGBUIBMY-UHFFFAOYSA-N Talcamine Natural products COC(=O)c1ccc(Oc2c(OC)ccc(CC3N(C)CCc4cc(OC)c(OC)c(Oc5cc6C(=O)N(C)CCc6cc5OC)c34)c2OC)cc1 RORFESPGBUIBMY-UHFFFAOYSA-N 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
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Abstract
本发明公开了一种用于太阳能板结构的改进的背膜。本发明还公开了一种制造背膜和包括该背膜的太阳能板的方法,该方法包括共挤工序。此外,公开了一种包括本发明的背膜的光伏太阳能板。本发明的背膜可以包括具有内表面和外表面的外层、具有内表面和外表面的中间层、以及具有内表面和外表面的内层。在本发明的一个实施方式中,中间层的外表面可以与外层的内表面邻接,并且中间层的内表面可以与内层的外表面邻接。
Description
相关专利申请的交叉引用
本申请主张提交于2012年9月25日的美国专利申请序列号13/626,838的优先权,其全部内容通过引用的方式并入于此。
技术领域
本发明涉及一种用于光伏太阳能板结构的背膜。更具体地,本发明涉及一种用于光伏太阳能板结构的共挤背膜。本发明还涉及一种用于生产共挤背膜以及包含这样的背膜的太阳能电池的方法。
背景技术
目前市场上的光伏太阳能板模块一般包括前盖、第一密封层、一个或多个光伏电池、第二密封层以及绝缘层,该绝缘层与第二密封层在太阳能板模块的背部处邻接。绝缘层的目的在于,提供为了安全的电绝缘,并防止诸如漏电或可能的短路的性能问题。该绝缘层在本领域通常指的是“背膜”。
在过去的二十年里,这种绝缘层,或者说背膜,已经主要被设计为三层薄片结构,其利用:(i)含氟聚合物外层;(ii)双轴向拉伸聚酯(以下简称“PET”)芯层;以及(iii)要么是另一个含氟聚合物层,要么是烯烃粘合层,例如透明的聚乙烯(以下简称“PE”)或乙烯醋酸乙烯酯(以下简称“EVA”)薄膜。图1中描绘了这种类型的背膜结构。
含氟聚合物外层的功能仅仅是为内部的PET层提供长期的紫外线(“UV”)保护。众所周知,含氟聚合物提供卓越的户外耐候性以及长期的耐用性。然而,含氟聚合物是相当昂贵的组分,并且在多数条件下含氟聚合物层的使用寿命远远超过太阳能板的寿命。
一般的背膜的PET芯层用于以下两个功能:(i)提供卓越的绝缘特性;以及(ii)提供卓越的尺寸稳定性。这两种性质对于有效的背膜性能都是关键性的,并且需要在板的整个寿命中保持这两种性质。
现有背膜的第三层也提供了一些功能:(i)其使得模块的密封材料和背膜之间能够持久接合;(ii)其提供增大的反射率,从而提高太阳能板模块的效率;以及(iii)其还充当整个层压介质材料的一部分。
以往,上述背膜由层压在一起的单独的薄膜利用各种粘合剂制成。粘合剂的选择是关键,因为其被证明是背膜和模块结构中的薄弱环节之一,在应用中引起内层粘合问题。最近,含氟聚合物外层采用含氟聚合物涂层替代传统的薄膜来应用。这种方法已被证明具有两个主要优势:第一,省去了一个粘合层;以及第二,减小含氟聚合物层的厚度,从而减小制造太阳能板模块的整体成本。
然而,应注意的是,虽然PET层是具有良好尺寸稳定性的卓越的绝缘体,但是其确实具有一些负面特性。PET具有较差的抗紫外线性和耐水解性,这往往导致背膜过早的失效。
然而,最近,使用PET外层的背膜的引入获得了显著的市场份额。这些背膜由特殊的PET外层制成,该PET外层经过改良而提高了紫外线(UV)性质并减少水解作用的困扰。内层与含氟聚合物基背膜使用相同的未改良的PET,以及相同的烯烃粘合层。其结果是相当低成本的背膜,该背膜可能足够用于一些应用中。然而,这种结构仍然由粘合层制成,并且易于层间粘合失效。即使这样,改良的PET外层的性能还是优于未改良的PET层,事实是,这种背膜很可能最终被证明是不令人满意的。
最近,基于聚酰胺的背膜被引入太阳能板市场。被引入市场的最初产品是基于多个聚酰胺层,其中外层经过UV吸收剂和填料改良,以提供类似UV稳定性的一些性质。一般来讲,由于其较差的UV稳定性,聚酰胺不被用作外部应用。这些结构由与用于其他背膜相同的层压工序制成,并且也面临层间粘合问题。就这一点而言,在背膜应用中一般需要长链聚酰胺,由于这样的事实,即短链尼龙比长链聚酰胺吸收更容易吸收水分。通常,短链尼龙可以吸收高达约6.5%的水分,这些水分能够对背膜的电绝缘性质造成不利的影响。虽然,长链尼龙凭借最佳吸收仅约2%水分而具有更佳的性能,但是长链尼龙非常昂贵,进而显著增加了背膜的成本。
因此,目前使用的太阳能板背膜显露出多个留有改进空间的特性。首先,含氟聚合物层的使用是昂贵的,并且在一般太阳能板的应用中属于过度设计。第二,在光谱的相对侧,改良的PET或改良的聚酰胺在用于PV系统时具有极大的风险,因为其在很多应用中将过早的失效,引起板的潜在的不安全因素和效率低下。此外,使用了粘合剂的太阳能板系统在制造过程中容易出现问题,并且在实际应用中容易过早的失效。
因此,需要一种用于太阳能板系统的结构的有效的、耐用的、耐候的并且性价比高的背膜。还需要一种太阳能板背膜,其能够省去在背膜结构中使用粘合剂。还需要一种用于制造这样的太阳能板背膜的有效且性价比高的方法。
发明内容
本发明提供了一种背膜,实现了对有效的、耐用的、耐候的并且性价比高的背膜的需要,该背膜能够省去在光伏太阳能板系统的结构中使用粘合剂。此外,本发明提供了一种方法,实现了对用于制造这样的改进的太阳能板背膜的有效的方法的需要。
本发明的背膜可以包括但不限于,具有内表面和外表面的外层、具有内表面和外表面的中间层、以及具有内表面和外表面的内层。在本发明的一个实施方式中,中间层的外表面与外层的内表面邻接,并且中间层的内表面与内层的外表面邻接。外层、中间层和内层可以通过共挤工序来邻接,因而省去了使用粘合剂来将背膜的层接合在一起。本发明的背膜在效率、强度、耐候性、成本以及包含该背膜的太阳能板的使用寿命方面均有改进。
制造本发明的太阳能板的方法可以包括但不限于,共挤、吹塑薄膜或其他适当的制造工序,这并非主要依赖粘合剂来将背膜的各层结合在一起,尽管适当的粘合剂可能被用于背膜的每两层之间。
在一个实施方式中,本发明的背膜可以通过首先将包含聚酰胺和离聚物合金的外层材料、包含滑石粉(或其他适当的填充材料)填充的聚酰胺的中间层材料、以及包含聚酰胺和离聚物合金的内层材料进行干燥来生产。随后,外层材料、中间层材料和内层材料被加热至每个材料均可以被挤压成单独的片或板的状态。随后,外层材料、中间层材料和内层材料均被挤压成单独的片或板。随后,单独的片或板被结合在一起,以形成本发明的背膜。背膜包括单件三层片或板,其中层包括外层材料片或板、中间层材料的片或板、以及内层片或板。中间层片或板的外表面与外层片或板的内表面邻接,并且中间层的内表面与内层片或板的外表面邻接。
附图说明
通过参考以下对本发明的实施方式的具体描述,并结合附图,将有助于理解本发明。附图中相同的编号表示相同的部件,并且其中:
图1为现有技术中太阳能板背膜的实施方式的各层横截面示意图。
图2为本发明的太阳能板背膜的一个实施方式的各层的横截面示意图。
图3为框图,其描绘了通过流延薄膜工序制造本发明的背膜的方法的一个实施方式。
图4为包含本发明的太阳能板背膜的一个实施方式的太阳能电池结构的横截面示意图。
图5为框图,其描绘了通过吹塑薄膜工序制造本发明的背膜的方法的一个实施方式。
具体实施方式
应理解的是,本发明的图示、图像和描述已经被简化,以示出相关元件以便清楚地理解本发明,而为了清楚的目的,省去了很多在本发明中出现的其他元件。本领域普通技术人员能够了解,为了实施本发明,这些其他元件是所需的和/或必须的。然而,由于这些元件在本领域是公知的,并且由于这些元件对更好地理解本发明并没有帮助,所以在此并未提供对这些元件的讨论。
现在转到图2,其示出了本发明的一个实施方式中的背膜100的横截面示意图。背膜100可以包括具有内表面和外表面的外层110、具有内表面和外表面的中间层120、以及具有内表面和外表面的内层130。在背膜100的这个实施方式中,中间层120的外表面与外层110的内表面可以邻接,并且中间层120的内表面与内层130的外表面可以邻接。在本发明的一个实施方式中,如下所述,可以通过共挤工序将外层110、中间层120和内层130邻接,其中省去了对使用粘合剂来将背膜的各层接合在一起的需求。
本发明的背膜100消除了已知的层压的背膜中的很多缺陷,同时减少了生产背膜100的整体成本。本发明的背膜100利用比已知背膜的外层中使用的含氟聚合物性价比更高的材料,并且能够提供比PET的那些具有更好的耐候性质。
在本发明的一个实施方式中,背膜100可以通过共挤工序制成,该共挤工序能够通过其中的一个压模挤压多个不同材料层,从而在一个步骤或连续工序中产生最终的背膜100结构。背膜100可以包括三层,每层均提供表现为高耐用性和性价比的背膜所需的功能。背膜100的三层结构可以包括具有耐候性的外层110、尺寸稳定的绝缘太阳能模块密封芯层120、以及接合于芯层120的第三内层130。
在本发明的另一个实施方式中,背膜100的外层110可以包括沙林反射树脂(Surlyn ReflectionsTM)。Surlyn ReflectionsTM是一种聚酰胺和离聚物(含离子键的聚合物)合金,能够从杜邦公司购买到,并且其在杜邦公司的许可下由LTL制药公司在宾夕法尼亚州莫里斯维尔制造。
一般地,Surlyn ReflectionsTM已经被用于汽车的外部应用,并且提供卓越的耐候性和UV性能。Surlyn ReflectionsTM(一种聚酰胺和离聚物合金)利用专有的相容剂以产生一种树脂,该树脂非常均匀并且稳定。合金中的聚酰胺为材料提供卓越的机械性质,而离聚物提供卓越的韧度和抗UV性能。合金中含有的离聚物还大幅减少了聚酰胺组分中常见的吸湿作用。此外,Surlyn ReflectionsTM中含有的离聚物为烯族材料,该材料不会吸收水分并且对其他材料具有卓越的粘合性。因此,与用于PV应用中的现有的背膜外层相比,在PV应用中采用Surlyn ReflectionsTM产品提供了良好设计的外层110。
此外,包括Surlyn ReflectionsTM的外层110可以被染色,以提供任何所需的颜色,例如白色或黑色,这取决于太阳能板布置在何处以及是否需要额外的吸收或反射。由其他低成本的烯烃构成的相容的合金例如聚乙烯或聚丙烯也可以被利用,然而,离聚物能够为粘合接线盒与背膜带来优势,并具有更高的温度稳定性。在本发明的一个实施方式中,外层110可以包括黑色Surlyn ReflectionsTM。
中间层120可以包括滑石粉填充的聚酰胺(以下简称“PA”)。PA610、PA612、PA11、PA12和PA9T都可以用于中间层120的替换材料。中间层120的优选材料之一可以包括PA612或者PA610,原因在于PA612成本低,PA610为生物可再生并且环境友好的聚合物材料,同样具有相对低的成本。在一个实施方式中,PA610可以包括高达约百分之六十五(65%)的可再生材料。在PA610的这类实施方式中,这类可再生材料可以从蓖麻油中获得。
中间层120还可以提供比已知的背膜卓越的介电性质、尺寸稳定性和较高的温度性能。尼龙可以被约十(10%)到约四十(40%)的滑石粉填充,其中优选的填料量约为二十五(25%)。
类似外层110,背膜100的内层130也可以包括聚酰胺和离聚物合金层,例如SurlynReflectionsTM。一般来讲,当内层130具有增强的反射率时,面对PV电池的层为太阳能板模块提供更加有效的操作。当使用本发明的背膜100时,太阳能板的整体效率比使用暗色的背膜时显著增加了高达约百分之五(5%)。
就这一点而言,内层130可以包括高度反光的白色聚酰胺和离聚物合金层,例如Surlyn ReflectionsTM,其显示出良好的接合特性,并且与EVA密封件接合的特别好,提供超过约70N/cm的接合强度。尽管内层130可以包括更加传统的透明的PE或EVA,但是使用诸如Surlyn ReflectionsTM的高度反光的白色聚酰胺和离聚物合金层形成的内层130,其具有大于约一百五十摄氏度(150℃)的熔点,并因而不会在板层压的工序中渗出水分。就这一点而言,包括EVA层的背膜易于在板层压过程中出现EVA层流动,因为EVA的熔点低于普遍用于板层压工序中的温度,该温度一般为一百四十摄氏度(140℃)到一百五十摄氏度(150℃)。在本发明的一个实施方式中,内层130可以包括黑色的Surlyn ReflectionsTM。
在本发明的背膜100的另一个实施方式中,背膜100包括三个共挤层,以用于太阳能模块。在这个实施方式中,背膜100在某种程度上用作光伏太阳能板的外部绝缘。在本发明的一个实施方式中,背膜100可以包括以下层:
1.内层
内层130的内表面与PV模块的密封层的外表面或底表面相接触,并且该内层可以包括与尼龙树脂紧密混合的离聚物树脂,还可以包括重量百分比约为百分之二(2%)至百分之十五(15%)之间的或其他合适比例的二氧化钛白色颜料。在这个实施方式中,内层130还可以包括UV吸收套,特别是,如果密封层缺乏这类添加剂时,然而,这类添加剂可以出现在PV电池的内层130和密封层这两层中。离聚物树脂可以被镀锌或钠基,而尼龙可以包括例如尼龙6、尼龙66、尼龙610或尼龙612。
虽然内层130可以具有任何适当的厚度,但是在本发明的一个实施方式中,内层130可以具有约十二微米(12μ)至约205微米(205μ)之间的厚度。非导电的炭黑颜料也可以被用于产生内层130的暗色或黑色。在内层130为暗色时,红外反射颜料也可以被用于降低温度。同样地,特别的颜料也可以被用于获得所需的内层130的颜色。
此外,位于与底密封层相邻的位置的内层130也可以包括适量的EVA树脂。在本发明的一个实施方式中,VA的重量百分比的范围可以从约百分之零(0%)至约百分之八(8%)。这种组成也可以含有相同的颜料和诸如离聚物/尼龙合金的其他添加剂。
2.中间层
背膜100的中间层120可以包括尼龙11、尼龙12、尼龙610或尼龙612中的任一个,还可以包含任何适量的填料。然而,在本发明的一个实施方式中,中间层120可以包括约百分之五(5%)至约百分之四十(40%)之间的填料。填料可以包括滑石粉、碳酸钙、滑石粉和碳酸钙的任何组合或者其他适当的材料。中间层120还可以包含颜料,例如TIO2或炭黑。在本发明的一个实施方式中,中间层120可以包括约百分之零点五(0.5%)至百分之八(8%)的颜料。
中间层120可以具有任意适当的厚度,然而,在本发明的一个实施方式中,中间层120可以具有约七十五微米(75μ)至约一百八十微米(180μ)之间的厚度。
3.外层
外层110可以包括与尼龙树脂的紧密混合的离聚物树脂,还可以包含适量的颜料。在本发明的一个实施方式中,外层110可以包括约百分之四(4%)至约百分之十五(15%)之间的二氧化钛颜料。UV吸收剂也可以被加入。离聚物树脂可以包括钠基或锌基离聚物,而尼龙树脂可以包括尼龙6、尼龙66、尼龙610或尼龙612。虽然外层110可以具有任何适当的厚度,但是在本发明的一个实施方式中,外层110可以具有约十二微米(12μ)至约二百零五微米(205μ)之间的厚度。
非导电的炭黑颜料也可以被用于产生外层110的黑色。当外层110为暗色时,红外反射颜料也可以被用于降低温度。此外,特别的颜料也可以被用于获得所需的颜色。
在本发明的方法的至少一个实施方式中,背膜100可以采用共挤工序来制造。为了实现本发明的背膜100的各层之间的改进接合,构成背膜100的层的材料一般可以具有相容性,并且具有足够接近的熔点,以便每种材料一般能够同时熔化,并且在该工序中任何给定时间的加工温度都不会造成较低熔点的材料退化。
现在转到图3,其示出了框图,描绘了用于制造背膜100的方法的一个实施方式,其中利用了共挤流延薄膜工序。通过在此描述的工序制造的背膜100在实际测试中显示出了卓越的性能。在本发明的一个实施方式中,当被用作外层110和内层130时,SurlynReflectionsTM被发现与其他聚酰胺相容,其他聚酰胺例如为滑石粉填充的耐热聚酰胺,其可以构成中间层120,虽然其他适当的材料也可以被用于外层110、中间层120和内层130。
在图3中所示的本发明的共挤工序的第一实施例中,背膜100采用以下三个材料层制造而成:
(1)外层110(图3中标示为材料A),其由包含约百分之十(10%)TIO2的白色SurlynReflections材料制成;
(2)中间层120(图3中标示为材料B),其由包含约百分之二十五(25%)滑石粉填料的PA612(杜邦158NC010)制成;以及
(3)内层130(图3中标示为材料C),其由与外层110相同的包含约百分之十(10%)TIO2的白色Surlyn Reflections材料制成。
在干燥箱/烘干机3210和3230中,分别将外层110和内层130都采用的SurlynReflections材料在约七十摄氏度(70℃)下干燥约4至6小时,以将材料中的水分重量百分比降至低于约0.15%。在干燥箱/烘干机3220中,将中间层120采用的PA612材料在约八十摄氏度(80℃)下干燥约4至6小时,以将材料中的水分重量百分比降至低于约百分之零点零五(0.05%)。
经过干燥的各个材料的颗粒从干燥箱/烘干机3210、3220和3230中分别气动地搬运至相应的挤出机3310、3320和3330中。随后,随着颗粒分别经过挤出机3310、3320和3330,外层110、中间层120和内层130由材料形成片或板。
挤出机3310和3330为戴维斯标准2.5寸长径比(L/D)30/1的单螺杆单元。挤出机3310和3330设有约230℃/230℃/240℃的温度分布。挤出机3320为戴维斯标准3.5寸长径比30/1的单螺杆单元。挤出机3320设有约235℃/235℃/245℃的温度分布。
随后,外层110、中间层120和内层130经过给料机和平坦的衣架压模3400,从而形成单件的三层片或板,这构成了背膜100。给料机/压模3400被设定温度约为二百四十摄氏度(240℃)。熔化的背膜100在叠合的三辊3500上被淬火,这个过程中还在薄膜表面上提供了微纹理表面。在这幅图示中,本发明的工序生产背膜100的速度约为100至300磅每小时。完成的背膜100随后被卷在主卷紧轴3600上。
在图3所描绘的本发明的共挤工序的第二实施例中,背膜100采用以下三个材料层制造:
(1)外层110(图3中标示为材料A),其由包含约百分之十(10%)TIO2的白色SurlynReflections材料制成;
(2)中间层120(图3中标示为材料B),其由包含约百分之二十五(25%)滑石粉填料的PA610(杜邦RSLC3090)制成;以及
(3)内层130(图3中标示为材料C),其由与外层110相同的包含约百分之十(10%)TIO2的白色Surlyn Reflections制成。
在干燥箱/烘干机3210和3230中,分别将外层110和内层130都采用的SurlynReflections材料在约七十摄氏度(70℃)下干燥约4至6小时,以将材料中的水分重量百分比降至低于约百分之零点一五(0.15%)。在干燥箱/烘干机3220中,将中间层120采用的PA610材料在约八十摄氏度(80℃)下干燥约4至6小时,以将材料中的水分重量百分比降至低于约百分之零点零五(0.05%)。
经过干燥的各个材料的颗粒从干燥箱/烘干机3210、3220和3230中分别气动地搬运至相应的挤出机3310、3320和3330中。随后,随着颗粒分别经过挤出机3310、3320和3330,外层110、中间层120和内层130由材料形成片或板。
挤出机3310和3330为戴维斯标准2.5寸长径比(L/D)30/1的单螺杆单元。挤出机3310和3330设有约230℃/230℃/240℃的温度分布。挤出机3320为戴维斯标准3.5寸长径比30/1的单螺杆单元。挤出机3320设有约240℃/250℃/260℃的温度分布。
随后,外层110、中间层120和内层130经过给料机和平坦的衣架压模3400,从而形成单件的三层片或板,这构成了背膜100。给料机/压模3400被设定温度约为二百四十摄氏度(240℃)。熔化的背膜100在叠合的三辊3500上被淬火,这个过程中还在薄膜表面上提供了微纹理表面。在这幅图示中,本发明的工序生产背膜100的速度约为100至300磅每小时。完成的背膜100随后被卷在主卷紧轴3600上。
在图3所描绘的本发明的共挤工序的第三实施例中,背膜100采用以下三个材料层制造:
(1)外层110(图3中标示为材料A),其由包含约百分之十(10%)TIO2的白色SurlynReflections材料制成;
(2)中间层120(图3中标示为材料B),其由包含约百分之四十(40%)滑石粉填料的PA11(阿科玛公司的丽绚(ArkemaRilsan))制成;以及
(3)内层130(图3中标示为材料C),其由与外层110相同的包含约百分之十(10%)TIO2的白色Surlyn Reflections制成。
在干燥箱/烘干机3210和3230中,分别将外层110和内层130都采用的SurlynReflections材料在约七十摄氏度(70℃)下干燥约4至6小时,以将材料中的水分重量百分比降至低于约百分之零点一五(0.15%)。在干燥箱/烘干机3220中,将中间层120采用的PA11材料在约八十摄氏度(80℃)下干燥约4至6小时,以将材料中的水分重量百分比降至低于约百分之零点零五(0.05%)。
经过干燥的各个材料的颗粒从干燥箱/烘干机3210、3220和3230中分别气动地搬运至相应的挤出机3310、3320和3330中。随后,随着颗粒分别经过挤出机3310、3320和3330,外层110、中间层120和内层130由材料形成片或板。
挤出机3310和3330为戴维斯标准2.5寸长径比(L/D)30/1的单螺杆单元。挤出机3310和3330设有约230℃/230℃/240℃的温度分布。挤出机3320为戴维斯标准3.5寸长径比30/1的单螺杆单元。挤出机3320设有约240℃/250℃/260℃的温度分布。
颗粒被气动地搬运至各自的挤出机中。挤出机A和C为戴维斯标准2.5寸长径比(L/D)30/1的单螺杆单元。挤出机A和C设有约230℃/230℃/240℃的温度分布。挤出机B为戴维斯标准3.5寸长径比30/1的单螺杆单元。挤出机B设有约240℃/250℃/260℃的温度分布。
随后,外层110、中间层120和内层130经过给料机和平坦的衣架压模3400,从而形成单件的三层片或板,这构成了背膜100。给料机/压模3400被设定温度约为250℃。熔化的背膜100在叠合的三辊3500上被淬火,这个过程中还在薄膜表面上提供了微纹理表面。在这幅图示中,本发明的工序生产背膜100的速度约为100至300磅每小时。完成的背膜100随后被卷在主卷紧轴3600上。
每台挤出机的给料速度是不同的,以生产以下结构的背膜100:
用于生产本发明的背膜100的其他挤压和/或非粘合层压方法也可以被采用,例如,吹塑薄膜方法。
现在转到图5,其示出的框图描绘了用于制造背膜100的方法的另一个实施方式,其中利用了共挤吹塑薄膜工序。在本发明的一个实施方式中,当被用作外层110和内层130时,Surlyn ReflectionsTM被发现与其他聚酰胺相容,其他聚酰胺例如为滑石粉填充的耐热聚酰胺,其可以构成中间层120,虽然其他适当的材料也可以被用于外层110、中间层120和内层130。
在图5所描绘的吹塑薄膜工序中,分别将外层110、中间层120和内层130采用的材料在干燥箱/烘干机5210、5220和5230中干燥,以将每种材料中的水分含量降至适当的处理水平。
随后,经过干燥的各个材料的颗粒从干燥箱/烘干机5210、5220和5230中分别气动地搬运至相应的挤出机5310、5320和5330中。随后,随着颗粒被加热至合适的温度并分别经过挤出机5310、5320和5330,外层110、中间层120和内层130由材料形成片或板。挤出机5310、5320和5330可以包括单螺杆单元,其温度分布被设置为适当的水平。
随后,外层110、中间层120和内层130经过多层多端口的吹塑薄膜压模4400(其可以进一步包括环形空气囊)和抗挤帐篷550,从而形成单件的三层片或板,这构成了背膜100。吹塑薄膜压模5400被设定为利于形成背膜100的适当温度。随后,熔化的背膜100可以被淬火,并且还可以在背膜100的表面上提供微纹理表面。完成的背膜100随后被卷在主卷紧轴5600上。
虽然本发明的背膜优选为不采用粘合剂来将背膜的各个层结合在一起,但是如果有需要,可以应用在背膜100的任意两层之间确实采用适量的粘合剂的制造工艺。
现在转到图4,其示出了包含本发明的太阳能板背膜的一个实施方式的太阳能电池构造400的横截面示意图。太阳能电池400包括前盖410、光伏电池430和背膜100,光伏电池430封装在一个或多个适当的密封件420和440中,其中包括顶密封部420和底密封部440。
前盖410可以由玻璃或其他适当的材料制成,其透射光线至PV电池430。密封部420和440可以包括单件整体的结构或者包括分开的密封部420和440,其结合在一起以封装PV电池430。密封部420和440可以进一步包括相同或不同的材料或多种材料。在一个实施方式中,顶密封部420可以包括这样的材料,其能够保护PV电池430,但是和前盖410一样,也能够透射光线至PV电池430。此外,底密封部440可以包括这样的材料,其也能够保护PV电池430,但是同样要么反射要么吸收光线,从而在某种程度上提高PV电池430的效率。
同样地,如图4所示的实施方式中,背膜100可以包括三层:外层110;中间层120;以及内层130。外层110可以包括聚酰胺和离聚物合金。中间层120可以包括滑石粉填充的聚酰胺。最后,内层130可以包括聚酰胺和离聚物合金,这可以与外层110的聚酰胺和离聚物合金相同或不同。
在背膜100的这个实施方式中,中间层120的外表面可以与外层110的内表面邻接,并且中间层120的内表面可以与内层130的外表面邻接。
在图4所示的太阳能电池400的实施方式中,PV电池430实质上封装在密封件420和/或430中。封装部420的外表面与前盖410的内表面邻接。封装部440的外表面与内层130的内表面邻接或以其他方式附着。
本文所公开的内容注重本发明的元件和方法的变型和修改,这是本领域技术人员通过本文所公开的内容的教示能够清楚了解的。因此,其意在本发明涵盖了本发明的更改和变型,并将这些更改和变型视为包含在所附权利要求及其等同的范围之内。
Claims (16)
1.一种光伏太阳能板背膜,其包括:
外层,其具有内表面和外表面,所述外层包括聚酰胺和离聚物合金;
中间层,其具有内表面和外表面;以及
内层,其具有内表面和外表面,所述内层包括聚酰胺和离聚物合金;
其中,所述中间层的所述外表面与所述外层的所述内表面不使用粘合剂直接邻接;并且所述中间层的所述内表面与所述内层的所述外表面不使用粘合剂直接邻接。
2.如权利要求1所述的光伏太阳能板背膜,其中所述中间层包括聚酰胺。
3.如权利要求1所述的光伏太阳能板背膜,其中所述内层和所述外层均具有0.5密耳至8密耳之间的厚度。
4.如权利要求1所述的光伏太阳能板背膜,其中所述中间层具有3密耳至7密耳之间的厚度。
5.如权利要求1所述的光伏太阳能板背膜,其中所述中间层包括PA11、PA12、PA610或PA612中的至少一个。
6.如权利要求1所述的光伏太阳能板背膜,其中所述中间层包括5%至40%之间的填料。
7.如权利要求1所述的光伏太阳能板背膜,其中所述中间层包括滑石粉填充的聚酰胺、碳酸钙填充的聚酰胺或滑石粉和碳酸钙填充的聚酰胺中的至少一个。
8.一种用于制造光伏太阳能板背膜的方法,其包括以下步骤:
将包含聚酰胺和离聚物合金的外层材料、包含滑石粉填充的聚酰胺的中间层材料、以及包含聚酰胺和离聚物合金的内层材料进行干燥;
将所述外层材料、中间层材料和内层材料加热至每个所述材料均可以被挤压成单独的片或板的状态;
将所述外层材料、中间层材料和内层材料挤压成单独的片或板;
形成包括单件三层片或板的所述背膜,其包括具有内表面和外表面的所述外层材料的片或板、具有内表面和外表面的中间层材料的片或板、以及具有内表面和外表面的所述内层材料的片或板;
其中,所述中间层材料的片或板的所述外表面与所述外层材料的片或板的所述内表面不使用粘合剂直接邻接,并且所述中间层材料的片或板的所述内表面与所述内层材料的片或板的所述外表面不使用粘合剂直接邻接。
9.如权利要求8所述的方法,其中所述方法包括共挤工序。
10.如权利要求9所述的方法,其中所述共挤工序包括共挤流延薄膜工序和共挤吹塑薄膜工序中的至少一个。
11.一种光伏太阳能板模块,其包括:
前盖,其具有内表面和外表面;
一个或多个光伏电池,其封装在密封件中,该密封件具有顶外表面和底外表面;
背膜,其包括:具有内表面和外表面的外层,并且所述外层包括聚酰胺和离聚物合金;具有内表面和外表面的中间层;以及具有内表面和外表面的内层,并且所述内层包括聚酰胺和离聚物合金;其中所述中间层的所述外表面与所述外层的所述内表面不使用粘合剂直接邻接,并且所述中间层的所述内表面与所述内层的所述外表面不使用粘合剂直接邻接;以及
其中,所述密封件的所述顶外表面与所述前盖的所述内表面邻接,并且所述密封件的所述底外表面与所述背膜的所述内层的所述内表面邻接。
12.如权利要求11的光伏太阳能板模块,其中所述中间层包括滑石粉填充的聚酰胺、碳酸钙填充的聚酰胺或滑石粉和碳酸钙填充的聚酰胺中的至少一个。
13.如权利要求11的光伏太阳能板模块,其中所述密封件包括顶部和底部,该顶部包括所述密封件的所述顶外表面,该底部包括所述密封件的所述底外表面。
14.如权利要求13的光伏太阳能板模块,其中所述密封件的所述顶部与所述密封件的所述底部包括相同的材料成分。
15.如权利要求13的光伏太阳能板模块,其中所述密封件的所述顶部与所述密封件的所述底部包括不同的材料成分。
16.如权利要求13的光伏太阳能板模块,其中所述密封件的所述顶部包括的材料成分允许光穿过所述密封件的所述顶部,其足以激活所述一个或多个光伏电池,并且所述密封件的所述底部包括的材料成分反射至少部分反射光,以提高所述一个或多个光伏电池的工作效率。
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WO2015168075A1 (en) * | 2014-04-29 | 2015-11-05 | E. I. Du Pont De Nemours And Company | Photovoltaic cells with improved backsheet |
WO2015168073A1 (en) * | 2014-04-29 | 2015-11-05 | E. I. Du Pont De Nemours And Company | Solar cell modules with improved backsheet |
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