CN101432138A - 用于低接触阻抗双极板应用的石墨/金属箔/聚合物基底层合物 - Google Patents
用于低接触阻抗双极板应用的石墨/金属箔/聚合物基底层合物 Download PDFInfo
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Abstract
一种用于PEM燃料电池的分割板及其制造方法,该方法包括提供片材料,该片材料中具有贯穿平面的通道。将石墨片置于片材料的第一面和第二面的每一个上以形成层合构件。将压缩力施加到层合构件上。石墨的第一部分被挤压成流动到贯穿平面的通道中。形成贯穿该片的导电路径阵列。将石墨的第二部分结合到第一面和第二面的每一个。
Description
技术领域
本发明涉及PEM燃料电池,特别涉及一种具有降低接触阻抗的分割板.
背景技术
在许多应用中,将燃料电池用作电源。例如,燃料电池已经被提议用于电动车动力装置以代替内燃机。在质子交换膜(PEM)类型的燃料电池中,将氢供应到燃料电池阳极,而氧作为氧化剂供应到阴极。PEM燃料电池包括膜电极组件(MEA),该膜电极组件包括薄的、质子穿透性的、不导电实体聚合物电解膜,该电解膜的一个面具有阳极催化剂,另一相对面具有阴极催化剂。该MEA夹于一对无孔性导电元件或分割板之间,该导电元件或分割板:(1).用作阳极和阴极的集电器;(2).包括形成在其中的适宜通道和/或开孔,以将燃料电池的气体反应物分配在相应的阳极和阴极催化剂表面之上。
术语“燃料电池”通常根据上下文用于指单个电池或者多个电池(堆)。通常将多个独立电池捆绑在一起以形成燃料电池堆,并且一般以电串连方式布置。堆中的每个电池包括在先描述的膜电极组件(MEA),且每个MEA提供了电压增量。将堆中相邻的每组电池称为簇。
对任一电路元件而言,其承载电流的能力由于功耗因素即元件阻抗通常要低于理想值。在典型分割板或称为背对背取向的双极板中,具有两种功耗:一种归因于板的体积阻抗,另一种归因于与相邻集电器/MEA的接触阻抗。导电分割板通常由金属如不锈钢制成,以充当集电器。尽管这种金属表现出有利的导电性能,但是它们也表现出横过板平面的不利接触阻抗。
发明内容
一种用于PEM燃料电池的分割板及其制造方法,该方法包括提供片材料,该片材料中具有贯穿平面的通道。将石墨片置于片材料的第一面和第二面的每一个上以形成层合构件。将压缩力施加到层合构件上。石墨的第一部分被挤压成流动到贯穿平面的通道中。形成贯穿该片的导电路径阵列。将石墨的第二部分结合到第一面和第二面的每一个。
根据其它特征,将粘合剂施加到该片的第一面和第二面的每一个。该粘合剂包括热活性粘合剂,以通过应用压缩力而将石墨结合到第一面和第二面的每一个。片材料包括聚合物基底比如聚酰亚胺基底。形成贯穿片材料的通道包括去除约40%的片材料。放置石墨包括放置石墨片,每个石墨片的厚度为片材料厚度的约5-10倍。施加压缩力包括碾压结合相应的石墨片到片材料。该方法还包括在所述层合构件中形成流场。
本发明在其它领域中的应用将通过以下的详细描述变得明晰。应当理解,详细描述和特定实例尽管标明为本发明的优选实施例,但是仍然仅为了示例的目的而不是来限制本发明的范围。
附图说明
本发明将通过结合以下的详细描述和附图说明而变得相当明晰,其中:
图1是位于PEM燃料电池堆中的燃料电池的立体分解图;
图2是根据本发明教导的分割板的截面图;
图3是根据本发明教导所使用的基底的透视图;
图4是图3的基底的透视图,示有施加到两相对面的热活性粘合剂;
图5是图4的基底的透视图,示有横过其平面的穿孔;
图6是图5的基底的透视图,示有施加到两相对面的石墨和施加到其上的压缩力;以及
图7是制造本发明分割板的步骤的流程图。
具体实施方式
以下实施例的描述本质上仅仅是示例性的,并非试图限制本发明及其应用和用途。
图1示例性地示出了部分PEM燃料电池堆10,其具有由无孔导电双极板20相互隔开的膜-电极-组件(MEA)14,16。该MEA14,16和双极板20叠合在一起并介于无孔导电双极板22,24之间。多孔、可透过气体的导电片或扩散媒介26,28,30,32压靠在MEA14,16的电极面上并作为电极的初级集电器。扩散媒介26,28,30,32还为MEA14,16提供机械支撑,尤其在MEA在流场中未被支撑的地点。适宜的扩散媒介包括碳/石墨纸/布料,细孔贵金属筛网,开孔泡沫贵金属等,它们导通来自电极的电流,同时允许气体从其中通过。
双极板22,24将初级集电器26压靠在MEA 14的阴极面14c上并将初级集电器32压靠在MEA 16的阳极面16a。双极板20将初级集电器28压靠在MEA 14的阳极面14a上并将初级集电器30压靠在MEA 16的阴极面16c上。氧化性气体如氧或空气从储罐38藉由适宜的供给管道40供应到燃料电池堆10的阴极侧。类似地,燃料如氢从储罐48藉由适宜的管道50供应到燃料电池堆10的阳极侧。
在优选的实施例中,氧罐38可以去除,空气可以从周围环境供应到阴极侧。同样,氢罐48可以去除,氢可以从转化器供应到阳极侧,该转化器从甲醇或液态烃(如汽油)催化产生氢。MEA的H2侧和O2/空气侧的排出管道52还用于从阳极流场移除氢气耗尽了的阳极气和从阴极流场移除氧气耗尽了的阴极气。尽管所示出的排出管道52为单个管道,应当理解可以提供不同的管道以排出每种气体。
参考图2-6,将详细描述根据本发明的分割板60。分割板60被构造成将反应气体之一承载到MEA 16的相应面。应当理解,每个双极板20,22,24包括两个布置成背对背取向的分割板60。根据本发明教导的分割板60提供有层合的石墨聚合物基底,该石墨聚合物基底具有通过其离散导电路径。更具体而言,分割板60包括可透过气体的聚合物基底64如聚酰亚胺基底。聚合物基底优选约为0.002″厚。适宜的聚酰亚胺材料包括由E.I.DuPont Corporation所制造的。将第一和第二石墨片66,70层合在聚合物基底64的相对面上。石墨层66,70的厚度优选约为比聚酰亚胺基底64厚5-10倍。因此,聚合物基底提供的片材料不导电,并且更重要的是,在分割板60中作为支撑基底,并具有足够的机械强度以在制造和组装过程中容易地进行处理。这样,本发明的优点是通过使用石墨来达到所需的导电性,而不会产生与纯石墨片相关的易脆性,该易脆性是相比于石墨/聚合物层合物而言的。还应当理解,图2和图6所示的分割板60被表示成在形成图1所示双极板20,22,24上的流场通道之前。
正如以下所详述的一样,石墨66,70起初位于聚合物基底64的相对面,随后受到压力作用。石墨的材料性能还允许石墨在受压作用过程中,横过聚合物基底64的平面流动到通道或穿孔72中。延伸过穿孔72的石墨通过聚合物基底64而形成离散的导电路径或导电柱74(图2),以提供相邻的MEA 14,16之间的电连通。最终提供了具有高强度和低接触阻抗的分割板60,该高强度部分地由聚合物基底64来提供,该低接触阻抗部分地由石墨层66,70来提供。
继续请参考图2-6,并结合图7,将描述制造分割板60的方法。一种制造根据本发明教导的分割板60的方法示于流程图图7中。该方法总体上用附图标记80来表示。在步骤84中,提供聚合物基底64(图3)。在步骤90中,热活性干粘合剂92被施加到聚合物基底64的相对表面(图4)。在步骤96中,将基底64以穿过其平面的方式进行穿孔而形成穿孔72(图5)。穿孔72可由任何适宜的加工操作而成形。穿孔72可以从基底64去除约30%-50%的材料,优选去除基底64的40%的材料。所示出的穿孔72具有大体呈柱形的构造,这简化了成形所必需的加工操作。然而,应当理解,在分割板60中,穿孔72(以及所导致的延伸通过其的石墨柱74)的大小、形状、密度、分布和位置可根据所给定燃料电池应用的规范和运行参数来选定。
接着在步骤112中(图6),将石墨片66,70的材料放置在基底64的相对面上。石墨片66,70优选约为0.010″厚。然而,如上所述,石墨层66,70的厚度可以约为比聚合物基底64厚5-10倍,但是也可以是其它厚度,这取决于所给定应用的需要和尤其是体积阻抗的需要。需要注意,因为干粘合剂92是热活性的,所以这时石墨片66,70未粘合到基底64。在步骤116中,将相对面上具有石墨片66,70的聚合物基底64如通过滚压组件以压缩方式放置(如图6中的箭头F所示)。施加到相应的石墨片66,70上的压缩力使得石墨横过基底64流动或挤压到穿孔72中(图2)。此外,热活性粘合剂92将残留石墨结合到聚合物基底64的缺少穿孔的相对面(如图2中122所指示)。例如横过材料平面通过诸如冲压操作使得所期望的流动图案最终在步骤120中形成(未具体示出)。
本领域技术人员可以通过以上的叙述理解到本发明宽泛的教导可以以各种形式得以应用。因此,尽管本发明已经结合特定的实施例进行了描述,本发明的真正范围不应当被限制与此,因为对本领域技术人员来说,通过研究附图、说明书和权利要求书,使得其它变更将变得明显。
Claims (22)
1.一种制造用于PEM燃料电池的分割板的方法,该方法包括:
提供片材料;
在所述片材料中形成贯穿平面的通道;
将石墨片置于所述片材料的第一面和第二面的每一个上以形成层合构件;以及
将压缩力施加到所述层合构件上,由此将所述石墨的第一部分挤压成流动到所述贯穿平面的通道中且形成贯穿所述片的导电路径阵列,而将石墨的第二部分结合到所述第一面和所述第二面中的每一个。
2.如权利要求1所述的方法,还包括将粘合剂施加到所述片的所述第一、第二面中的每一个。
3.如权利要求2所述的方法,其中施加粘合剂包括施加热活性粘合剂,所述热活性粘合剂通过应用所述压缩力将所述石墨结合到所述第一、第二面中的每一个。
4.如权利要求1所述的方法,其中提供所述片材料包括提供聚合物基底。
5.如权利要求4所述的方法,其中所述聚合物基底包括聚酰亚胺。
6.如权利要求1所述的方法,其中形成贯穿所述片材料的通道包括去除约40%的所述片材料。
7.如权利要求1所述的方法,其中放置石墨片包括放置多层石墨片,每个石墨片的厚度为所述片材料厚度的约5-10倍。
8.如权利要求1所述的方法,其中施加压缩力包括碾压结合所述相应的石墨片到所述片材料。
9.如权利要求1所述的方法,还包括在所述层合构件中形成流场。
10.一种制造用于PEM燃料电池的分割板的方法,该方法包括:
对不导电基底进行开孔以形成从所述基底的第一面到第二面延伸过所述基底的穿孔组;
将第一石墨片定位成与所述第一面接触,以形成层合构件;
压缩所述层合构件以将所述第一石墨片的第一部分挤压通过所述穿孔组;以及
将所述第一石墨片的第二部分结合到所述第一面。
11.如权利要求10所述的方法,还包括将第二石墨片定位成与所述第二面接触。
12.如权利要求10所述的方法,还包括施加粘合剂到所述基底的所述第一、第二面中的每一个。
13.如权利要求11所述的方法,其中压缩所述层合构件包括当施加压缩力到所述第一、第二石墨片时,将所述第一、第二石墨片挤压通过所述穿孔。
14.如权利要求10所述的方法,其中对不导电基底进行开孔包括去除约40%的所述不导电基底。
15.如权利要求10所述的方法,其中施加压缩力包括将所述相应的石墨片碾压结合到所述基底。
16.如权利要求10所述的方法,其中所述基底包括聚合物基底。
17.如权利要求16所述的方法,其中所述聚合物基底包括聚酰亚胺。
18.如权利要求11所述的方法,其中定位第一和第二石墨片包括放置石墨片,每个石墨片的厚度为所述基底厚度的约5-10倍。
19.如权利要求10所述的方法,还包括在所述层合构件中形成流场。
20.一种用于PEM料电池的分割板,包括:
不导电基底材料,其具有多个延伸在第一、第二面之间的穿孔;
石墨层,其被设置成横过所述第一、第二面中的每一个,从而界定层合构件;
石墨被挤压通过所述多个穿孔,并可以在所述第一、第二面之间形成电连通;
在所述层合构件中形成流场的几何形状。
21.如权利要求20所述的分割板,其中所述不导电基底包括聚合物材料。
22.如权利要求21所述的分割板,其中所述聚合物材料包括聚酰亚胺。
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US10/947,569 US20060063060A1 (en) | 2004-09-22 | 2004-09-22 | Graphite/metal foil/polymer substrate laminate for low contact resistance bipolar plate application |
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US9373923B2 (en) | 2011-11-22 | 2016-06-21 | Savannah River Nuclear Solutions, Llc | Rapid prototype extruded conductive pathways |
US10103390B2 (en) * | 2015-04-20 | 2018-10-16 | Energyor Technologies Inc | Method for producing kiss cut fluid flow field plates |
EP4163105A4 (en) * | 2020-06-05 | 2023-10-25 | Arisawa Mfg. Co., Ltd. | SEPARATING ELEMENT FOR A FUEL CELL AND METHOD FOR PRODUCING THE SEPARATING ELEMENT |
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JP2003223906A (ja) * | 2002-01-30 | 2003-08-08 | Aisin Seiki Co Ltd | 導電性部材の製造方法および燃料電池用セパレータの製造方法 |
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CN106848346A (zh) * | 2017-03-06 | 2017-06-13 | 周翔 | 液流电池用双极板及其制备方法 |
CN106848346B (zh) * | 2017-03-06 | 2019-07-26 | 昆山知氢信息科技有限公司 | 液流电池用双极板及其制备方法 |
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