CN104488121B - 用于连接燃料电池的部件的方法及装置 - Google Patents

用于连接燃料电池的部件的方法及装置 Download PDF

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Publication number
CN104488121B
CN104488121B CN201380039191.6A CN201380039191A CN104488121B CN 104488121 B CN104488121 B CN 104488121B CN 201380039191 A CN201380039191 A CN 201380039191A CN 104488121 B CN104488121 B CN 104488121B
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Prior art keywords
binding agent
component
precuring
fuel cell
solidification
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Expired - Fee Related
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CN201380039191.6A
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English (en)
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CN104488121A (zh
Inventor
C·伍尔夫
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Mercedes Benz Group AG
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DaimlerChrysler AG
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284Application of adhesive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/4835Heat curing adhesives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0046Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by constructional aspects of the apparatus
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284Application of adhesive
    • B32B37/1292Application of adhesive selectively, e.g. in stripes, in patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B38/0008Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
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    • H01M8/0267Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • HELECTRICITY
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    • H01M8/0273Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • HELECTRICITY
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    • HELECTRICITY
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    • B29C65/1403Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1406Ultraviolet [UV] radiation
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/48Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
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    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/9161Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
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Abstract

本发明涉及一种连接燃料电池的部件(1,2,3)的方法,其中,将液态的可光化学固化的粘合剂(5)至少局部施加到所述燃料电池的至少一个部件(1,2,3)上、进行光化学预固化、与所述燃料电池的至少另一部件(1,2,3)进行接触,以及进行固化。根据本发明,对所述部件(1,2,3)的至少两个部件区域(B1,B2)内的所述可光化学固化的粘合剂(5)进行不同程度的光化学预固化。本发明还涉及一种用于连接燃料电池的部件(1,2,3)的装置。

Description

用于连接燃料电池的部件的方法及装置
技术领域
本发明涉及一种如权利要求1的前序部分的特征所述的连接燃料电池的部件的方法,以及一种如权利要求7的前序部分的特征所述的用于连接燃料电池的部件的装置。
背景技术
现有技术中,US 2009/0162734 A1公开过一种制造燃料电池的膜电极单元的方法。其中,将借助光照固化的树脂施加到覆有催化剂的膜片(CCM)上,并通过光照对该树脂进行预固化。为构建膜电极单元,向该膜片上施加气体扩散层,并使其与经过预固化的树脂接触。随后在热固化过程中将该树脂完全固化。
WO 2008/040682 A1提出一种制造膜片-电极单元的方法。该膜片-电极单元包含阳极催化剂层,聚合物电解质膜片,以及阴极催化剂层。在该方法中,将由可UV固化材料构成的第一边缘施加到聚合物电解质膜片上,其中,该聚合物电解质膜片的内部区域保持无可UV固化材料的状态。涂覆一催化剂层,该催化剂层将聚合物电解质膜片的内部区域覆盖,并与第一边缘交叠。将由可UV固化材料构成的第二边缘施加到第一边缘上,其中,第二边缘将催化剂层包围。将由可UV固化材料构成的第三边缘施加到第二边缘上,其中,第三边缘与催化剂层交叠。用UV辐射对第一、第二和第三边缘进行照射。
发明内容
本发明的目的是,提供用于连接燃料电池的部件的一种改进型方法及一种改进型装置。
本发明用以达成上述目的的解决方案是,一种具有权利要求1所述特征的连接燃料电池的部件的方法,以及一种具有权利要求7所述特征的用于连接燃料电池的部件的装置。
本发明的优选技术方案由从属权利要求给出。
在所述连接燃料电池的部件的方法中,将液态的可光化学固化的粘合剂至少局部施加到所述燃料电池的至少一个部件上、进行光化学预固化、与所述燃料电池的至少另一部件进行接触,以及进行固化。
根据本发明,对所述部件的至少两个部件区域内的所述粘合剂进行不同程度的光化学预固化。该预固化也称作对所述粘合剂的预交联。
这样便能针对性地对所述粘合剂的流变属性进行调节,从而使该流变属性与所述部件的不同部件区域内的相应需求相匹配,以便可以确保以最佳的方式将所述燃料电池的待相互粘合的部件粘接。对所述粘合剂的较高程度的预固化能够提高所述粘合剂的粘度,从而防止所述粘合剂在所述部件上流散。较低程度的预固化使得所述粘合剂在预固化后具有相应较低的粘度,即具有较高的流动性,以便其可以更佳地分布,以及例如可以更佳地进入粗糙和/或多孔的结构,从而例如借助所述粘合剂使粗糙变得平坦。这样便能将所述粘合剂例如也用作密封件,其中,借助特别是在一部件区域内的最佳且均匀的分布实现可靠的密封效果,在该部件区域内所述粘合剂在预固化后仍具有小的粘性。
与现有技术中已知的热固化且平面接合的薄膜状粘合剂相比,采用所述液态的、可光化学固化的粘合剂时不会产生边角料,因而不增加材料用量。此外,所述可光化学固化的粘合剂有助于大幅缩短固化时间,以及,与所述薄膜状粘合剂不同,所述可光化学固化的粘合剂以无接触的方式固化。采用所述可光化学固化的粘合剂还能减小成本。
在一种优选实施方式中,将所述可光化学固化的粘合剂仅施加到所述至少一个部件的一部件区域中,随后在该部件区域中还对所述粘合剂进行光化学预固化。亦即,对施加到所述至少一个部件上的所有可光化学固化的粘合剂进行光化学预固化,其中,在所述燃料电池的所述至少一个部件的不同部件区域内对所述粘合剂进行不同程度的光化学预固化。这样便不会对不受控制的流散部分进行预固化,从而防止施加到所述燃料电池的所述至少一个部件上的粘合剂的极其稀薄,亦即,例如防止所述部件的不需要施加粘合剂的区域被所述粘合剂润湿。
优选将所述可光化学固化的粘合剂至少局部施加到所述燃料电池的构建为膜电极单元的第一框架元件的第一部件上及所述燃料电池的构建为所述膜电极单元的第二框架元件的第三部件上,其中,在对所述可光化学固化的粘合剂进行过光化学预固化后,将所述燃料电池的构建为所述膜电极单元的覆有催化剂的膜片的第二部件定位在所述第一部件与所述第三部件之间,将所述三个部件接合在一起,以及对所述可光化学固化的粘合剂进行固化。在将所述三个部件接合在一起的过程中,使所述粘合剂同样与所述第二部件接触,从而也将所述第一部件与所述第三部件粘合,以及将所述第二部件与所述另两个部件粘合。
其中,在将所述三个部件接合在一起前,例如在所述膜电极单元的流入区域和/或流出区域内进行更高程度的预固化,这是因为所述流入区域和/或流出区域是所述膜片-电机机构的接合复合体中的无支撑式结构,故需要较高的几何精度。借助对所述粘合剂的较高程度的预固化,所述粘合剂具备所需的强度,从而在这些部件区域内防止所述粘合剂的流散。
在所述覆有催化剂的膜片的在所述两个框架元件(这些框架元件例如均构建为由聚丙烯构成的聚合物膜)间的包围区域内,由于预固化程度较低,所述粘合剂仍保持足够稀薄,以便确保对所述覆有催化剂的膜片的多孔表面进行最佳的润湿,以及在所述覆有催化剂的膜片与所述两个相互粘合的框架元件间构建内部密封件。所述覆有催化剂的膜片例如构建为塑料膜,其覆有例如形式为碳粉的碳。所述覆有催化剂的膜片多孔,且具有较大的表面。尤其由于该多孔性导致需要相对稀薄的粘合剂,以便对所述覆有催化剂的膜片的待与所述两个框架元件粘合的边沿区域内的孔隙进行填充,从而确保与所述两个框架元件的最佳粘合,以及确保所述粘合剂的密封效果。
优选用紫外线辐射和/或红外线辐射对所述可光化学固化的粘合剂进行光化学预固化。为此,用紫外线辐射和/或红外线辐射对所述粘合剂进行照射。例如用一个,或有利地用多个构建为发光二极管(即发射UV光或红外光的二极管)或呈管状的辐射源来实施这一操作,亦即,用管状的UV辐射器或红外线辐射器来实施。如果采用若干管状UV辐射器,则这些UV辐射器例如可以分别构建为低压辐射器、中压辐射器或高压辐射器。借助多个这类辐射源对所述覆有粘合剂的部件进行平面式照射。用紫外线辐射和/或红外线辐射来进行固化特别是能够防止所述粘合剂单凭可见光就发生固化,从而防止所述粘合剂发生不受控制的固化。为此,当然必须采用相应地需要用紫外线辐射和/或红外线辐射来固化的可光化学固化的粘合剂。但在本发明的范围内优选采用UV辐射。
在一种优选实施方式中,对所述可光学固化的粘合剂进行光化学固化,也就是说,在将所述待相互粘合的部件接合在一起,并与所述可光化学预固化的粘合剂进行接触后,同样以光化学方式实施对所述可光学固化粘合剂的固化。这样不仅能无接触地实现对所述粘合剂的预固化,还能无接触地实现对所述粘合剂的完全固化。亦即,无需将所述部件,即所述待相互粘合的部件与加热元件接触,也无需较高的热输入。这样便能防止所述部件因过于剧烈的热效应而受损。同样有利地用紫外线辐射和/或红外线辐射来实施对所述粘合剂的固化。为此可以采用用于对所述粘合剂进行预固化的同一照射机构。
但作为替代方案,也可以以其他方式来实施对所述粘合剂的固化。相应地,所述可光学固化的粘合剂必须是既可光化学固化,又可以其他方式固化的粘合剂,例如借助由至少一个加热单元进行的热输入固化,亦即,是至少也可以光化学固化的粘合剂。在所述方法的该实施方式中,以光化学方式对所述至少也可以光化学固化的粘合剂进行预固化,以及,以其他方式(例如加热)对其进行固化。
在对所述粘合剂进行光化学预固化前,有利地如此对所述覆有所述可光化学固化的粘合剂的部件进行掩饰,即以不同的照射强度对所述至少两个部件区域进行照射来实施对所述粘合剂的光化学预固化。这样便实现对所述粘合剂的不同程度的预固化。要么不对所述需要对粘合剂进行较高程度预固化的部件区域进行掩饰,要么将该区域内的掩饰结构构建为:与需要对粘合剂进行较低程度预固化的部件区域内的掩饰结构相比,对相应采用的辐射(有利地为紫外线辐射和/或红外线辐射)来说具有更高的透过度。其中,所述掩饰结构可以构建为:所述粘合剂所需的预固化程度越低,所述掩饰结构对所述辐射的吸收和/或反射程度就相应越高。所述掩饰结构所吸收和/或反射的辐射越多,透过所述掩饰结构的、既未被掩饰结构反射也未被吸收、从而到达所述粘合剂来对其进行光化学预固化的辐射就越少。
也可以在将所述部件接合在一起后使用这一掩饰结构来对所述可光化学固化的粘合剂进行固化,以便在此情形下同样在不同的部件区域内实施不同的照射,从而实现所述粘合剂的不同固化特性。其中,如果以与预固化类似的方式实施固化,则可以重新使用已用于预固化的同一掩饰结构。
在一种优选实施方式中,利用丝网印刷将所述可光化学固化的粘合剂施加到所述燃料电池的所述至少一个部件上。这样便能高度精确地施加所述粘合剂。尤其这样便能选择性地施加所述粘合剂,亦即,例如可以将所述粘合剂仅局部地,而不是整面地施加到所述部件上,以及,在不同的区域内以不同的程度施加。作为替代方案,例如也可以用喷射或喷涂、涂抹或其他已知的印刷技术或粘合剂施加技术来施加所述粘合剂。
本发明的用于连接燃料电池的部件的,用于实施所述连接燃料电池的部件的方法的装置包括施加单元、照射机构和掩饰结构,所述施加单元用于将可光化学固化的粘合剂至少局部施加到所述燃料电池的至少一个部件上,所述照射机构用于对所述可光化学固化的粘合剂进行光化学预固化,所述掩饰结构用于如此将所述燃料电池的覆有所述可光化学固化的粘合剂的部件至少局部掩饰,即能以不同的照射强度对至少两个部件区域进行照射来实施对所述可光化学固化的粘合剂的光化学预固化。也可以在将所述部件连接后,即在将所述待相互连接的部件与所述粘合剂接触后,利用该装置,特别是利用所述装置的照射机构来对所述可光化学固化的粘合剂进行光化学固化。
利用所述装置便能实施所述方法,从而实现所述方法带来的如上文所述的优点。这样便能针对性地对所述粘合剂的流变属性进行调节,从而使该流变属性与所述部件的不同部件区域内的相应需求相匹配,以便可以确保以最佳的方式将所述燃料电池的待相互粘合的部件粘接。对所述粘合剂的较高程度的预固化能够提高所述粘合剂的粘度,从而防止所述粘合剂在所述部件上流散。较低程度的预固化使得所述粘合剂在预固化后具有相应较低的粘度,即具有较高的流动性,从而所述粘合剂能更佳地分布,以及例如更佳地进入粗糙和/或多孔的结构,从而例如借助所述粘合剂能使粗糙变得平坦。这样便能将所述粘合剂例如也用作密封件,其中,借助特别是在所述部件区域内的最佳且均匀的分布能实现可靠的密封效果,在该部件区域内所述粘合剂在预固化后仍具有较小的粘性。
对所述粘合剂的不同程度的预固化是通过所述掩饰结构来实现的。要么不对所述需要对粘合剂进行较高程度预固化的部件区域进行掩饰,要么将该区域内的掩饰结构构建为,与需要对粘合剂进行较低程度预固化的区域相比,对所述辐射来说具有更高的透过度。其中,所述掩饰结构可以构建为:所述粘合剂所需的预固化程度越低,所述掩饰结构对所述辐射的吸收和/或反射程度就相应越高。
所述照射机构优选具有至少一个构建为发光二极管的辐射源和/或至少一个管状辐射源。所述照射机构有利地具有多个这类辐射源。尤其借助这些辐射源来对所述覆有粘合剂的部件进行平面式照射。
所述至少一个辐射源有利地构建为发射紫外线辐射的辐射源和/或发射红外线辐射的辐射源。这样便能用紫外线辐射和/或红外线辐射对所述可光化学固化的粘合剂进行光化学固化。尤其,这样便能防止所述粘合剂单凭可见光就发生固化,从而防止所述粘合剂发生不受控制的固化。
所述施加单元优选构建为丝网印刷单元。这样便能高度精确地施加所述可光化学固化的粘合剂。尤其这样便能选择性地施加所述粘合剂,亦即,例如可以将所述粘合剂仅局部地,而不是整面地施加到所述部件上,以及,在不同的区域内以不同的程度施加。
附图说明
下面参照附图对本发明的实施例进行详细说明。
附图示出:
图1为连接燃料电池的部件的方法的示意性流程图,
图2为用可光化学固化的粘合剂润湿的燃料电池部件的示意性俯视图,
图3为依据图2中的剖面线III-III的燃料电池部件、掩饰结构及照射机构的示意性剖视图,以及
图4为膜电极单元、掩饰结构及照射机构的示意性剖视图。
在所有附图中,相同的零件以同一附图标记表示。
具体实施方式
图1为用于连接此处未详细绘示的燃料电池的部件1、2、3的方法的示意性流程图。图2至4结合示例示意性示出方法流程,其中,使用所述方法构建所述燃料电池的膜电极单元4。为此,将三个部件1、2、3彼此相连,其分别是构建为所述膜电极单元4的第一框架元件的第一部件1,构建为所述膜电极单元4的覆有催化剂的膜片的第二部件2,和构建为所述膜电极单元4的第二框架元件的第三部件3。
为将这些部件1、2、3彼此相连,在第一方法步骤S1中,将液态的可光化学固化的粘合剂5局部地施加到第一部件1和第三部件3上,即施加到所述第一和所述第二框架元件上。随后,在第二方法步骤S2中对粘合剂5进行光化学预固化。在第三方法步骤S3中,以预设的方式对所述三个部件1、2、3相对彼此定位,从而使得第二部件2,即所述覆有催化剂的膜片也与施加在第一部件1及第三部件3上的粘合剂5接触。随后,在第四方法步骤S4中对粘合剂5进行固化。
举例而言,所述燃料电池的膜电极单元4的所述两个框架元件,即第一和第三部件1、3均构建为例如由聚丙烯构成的聚合物膜。如图2所示,这些框架元件均具有设于中心区域内的大面积的第一凹口A1。其中,图2仅示出第一部件1,即所述第一框架元件。而第三部件3,即所述第二框架元件也以相对应的方式构建。因此,下文的说明对两个框架元件,即对图2所示第一部件1及以与之对应的方式构建的第三部件3均适用。
在第一和第三部件1、3的第一凹口A1的区域内,需要布置第二部件2,即所述覆有催化剂的膜片。借此使得所述覆有催化剂的膜片被所述框架元件围绕,即边沿处被包围。所述覆有催化剂的膜片例如构建为一塑料膜,该塑料膜覆有例如形式为碳粉的碳。所述覆有催化剂的膜片多孔,且具有较大的表面。
所述框架元件,即第一和第三部件1、3还具有设于横向边沿区域内的第二凹口A2,所述第二凹口用作膜电极单元4的流入区域和/或流出区域,即用作所谓的“端口”。通过这些第二凹口A2将反应气体引入所述燃料电池的活性区域,或将反应产物从该区域引出。此外,调温介质可通过一个或多个这种第二凹口A2穿过所述燃料电池的相应调温介质区域,即将所述调温介质引入该区域并重新引出。
现有技术中的已知方案是,用热固化且平面接合的薄膜状粘合剂将这些框架元件与覆有催化剂的膜片连接。但采用这种薄膜状粘合剂时会产生较多的边角料,因而所需的材料用量相应较大,成本也相应较高。此外,该薄膜状粘合剂需要较长的固化时间,且必须通过设置加热元件,即通过将该加热元件与框架元件和/或覆有催化剂的膜片进行接触来进行固化。在此情形下可能会因热输入过高而造成损坏。
现有技术中还公开过采用液态粘合剂,并对该液态粘合剂进行光化学预固化的方案。但该预固化操作通过均匀的整面照射来实施,以便在所有区域内实现对粘合剂的均匀预固化。在此情形下,在将待连接的零件接合后,还是以热方式实施对粘合剂的完全固化,其缺点如上文所述。
在此处所示的方法中,在第一方法步骤S1中将液态的可光化学固化的粘合剂5有针对性地施加到第一部件1和第三部件3的,即所述框架元件的预设的部件区域B1、B2上。可以为两个部件1、3同时或先后实施此方法步骤。其中,有针对性地施加表示,不仅对粘合剂5所施加于的相应部件区域B1、B2,还对相应待施加的粘合剂5的量进行预设。例如用丝网印刷法来非常精确地实施这种有针对性的施加。为此,用于实施所述方法的装置的此处未详细绘示的施加单元构建为丝网印刷单元。若需将粘合剂5同时施加到第一和第三部件1、3上,则需要将施加单元构建得比较大,或需要两个施加单元。
如图2所示,在该实施例中,将粘合剂5施加到第一部件1和第三部件3的将凹口A1、A2包围的边沿区域上,即施加到将第一或第三部件1、3的第一凹口A1围绕的第一部件区域B1上,以及施加到分别将第一或第三部件1、3的第二凹口A2围绕的第二部件区域B2上。上文已提及,为清楚起见,图2仅示出第一部件1。但如上文所述,针对第三部件3的粘合剂涂覆以相同的方式实施。其中,仅将粘合剂5施加到相应部件1、3的一个表面侧。此时,通过该表面侧将两个部件1、3相互粘合,以及分别与第二部件2粘合。
施加完毕后,被施加于第一部件1和第三部件3的所有部件区域B1、B2上的粘合剂5随即具有相同的稠度,亦即,所述粘合剂为液态,因而具有极小的粘度。粘合剂5可光化学固化,亦即,用一个或多个预设波长的光进行的照射会在粘合剂5中触发化学反应,该化学反应导致粘合剂5逐渐固化或交联,因而所述粘合剂的粘度在持续的照射下一直增大,直至粘合剂5完全固化。该光化学过程的速度与作用于粘合剂5上的照射强度有关,亦即,所述照射强度越高,粘合剂5固化得越快。必要时根据相应使用的粘合剂类型,在开始固化前首先借助照射将粘合剂5激活,随后再将其逐渐固化。
为防止粘合剂5发生不受控制的固化,有利地采用在可见光下不会固化或至少仅略微固化,而是需要通过紫外线辐射和/或红外线辐射进行光化学固化的粘合剂5。这样便能在避免粘合剂5在正常环境光条件下发生固化的情况下制造膜电极单元4,而不必承担粘合剂5发生不受控制的固化的风险,因为可以可控地应用紫外线辐射和/或红外线辐射来实施对粘合剂5的固化。
在第一方法步骤S1中将粘合剂5施加到第一部件1和第三部件3上,即施加到所述两个框架元件上后,在第二方法步骤S2中对粘合剂5进行光化学预固化。但此时并非以现有技术中已知的整面均匀照射的方式,而是针对性地实施预固化。亦即,在第一部件1或第三部件3的不同部件区域B1、B2内对粘合剂5进行不同程度的预固化或预交联。例如能够通过以不同的照射强度作用于这些不同部件区域B1、B2内的粘合剂5上的辐射来实现这一点。
为此,如图3所示,通过相应的部件1、3,即在相应部件1、3的覆有粘合剂5的一侧与用于实施所述方法的所述装置的照射机构6之间,布置掩饰结构7。为清楚起见,图3仅示出依据图2中的剖面线III-III的第一部件1的剖视图。相应地,对于掩饰结构7也仅大体示出所述覆盖了第一部件1的所示区域的区域的横截面。
使用掩饰结构7可以对相应部件1、3进行局部掩饰。其中,同样为用于实施所述方法的所述装置的组成部分的掩饰结构7具有第一掩饰区域7.1和第二掩饰区域7.2,其中,第一掩饰区域7.1和第二掩饰区域7.2如此构建,即这些掩饰区域使照射机构6所发射的辐射透过并不同程度地到达相应部件1、3上的粘合剂5。
亦即,第一掩饰区域7.1和第二掩饰区域7.2例如对照射机构6所发射的辐射具有不同的吸收和/或反射能力。掩饰区域7.1、7.2对照射机构6所发射的辐射的吸收和/或反射程度越高,透过掩饰结构7到达相应掩饰区域7.1、7.2下的粘合剂5的、用于对该粘合剂进行光化学预固化的辐射就越少,亦即,在布置于相应掩饰区域7.1、7.2下的部件区域B1、B2内作用于粘合剂5的照射强度也就越小。掩饰结构7的位于掩饰区域7.1、7.2间的区域无关紧要,因为其下方未设置粘合剂5,亦即,这些区域例如可以完全透明,或者,局部或完全不透明。
为清楚起见,图3同样仅根据第一部件1,即所述第一框架元件示出上述方案,但以类似的方式为第三部件3,即所述第二框架元件实施该方案。可以同时或先后实施。先后实施时,可采用所述装置的同一掩饰结构7和同一照射机构6,同时对粘合剂5进行预固化时,则相应地需要两个这种掩饰结构7,以及,需要两个照射机构6或一个足够大的照射机构6,以便能够同时对两个经掩饰的框架元件进行照射。
在附图示出的实施例中,第一掩饰区域7.1对照射机构6所发射的辐射的反射/吸收程度比第二掩饰区域7.2更高,亦即,与第一掩饰区域7.1相比,第二掩饰区域7.2对照射机构6所发射的辐射来说具有更高的透过度。因此,照射机构6所发射的辐射透过第二掩饰区域7.2的程度比透过第一掩饰区域7.1的程度更高。如图3所示,掩饰结构7如此定位于照射机构6与第一部件1或第三部件3的覆有粘合剂5的一侧之间,使得第一掩饰区域7.1相对于照射机构6所发射的辐射覆盖第一部件区域B1,以及,第二掩饰区域7.2相对于照射机构6所发射的辐射覆盖第二部件区域B2。
随后借助照射机构6,用紫外线辐射和/或红外线辐射对第一部件1及第三部件3进行照射。在用紫外线辐射和红外线辐射进行照射的情况下,例如可以从紫外线辐射或红外线辐射开始先后或多次交替地实施上述操作。相应的照射持续时间例如需要根据相应采用的粘合剂5和/或照射机构6中所采用的辐射源的功率来设定。
这些辐射源例如实施为发射紫外线辐射和/或红外线辐射的发光二极管或管状辐射源,亦即,必须根据所需用于对粘合剂5进行光化学固化的辐射选择辐射源。发光二极管(LED)例如构建为发射UV光或红外光的二极管。特别是用于UV辐射的管状辐射源例如实施为所谓汞蒸气低压管、汞蒸气中压管、汞蒸气高压管或汞蒸气最高压管。所述辐射源优选布置在平面式的照射机构6中,以便实现大面积的均匀照射。这样便对掩饰结构7进行整面且均匀的照射。在此情形下,借助掩饰结构7为第一部件1或第三部件3的不同部件区域B1、B2内的粘合剂5实现不同的照射强度。
将第一部件区域B1覆盖的第一掩饰区域7.1被照射机构6所发射的辐射较低程度地透过,以及,将第二部件区域B2覆盖的第二掩饰区域7.2被照射机构6所发射的辐射较高程度地透过,因此,作用于第二部件区域B2及该第二部件区域上所施加的粘合剂5的照射强度,比作用于第一部件区域B1及该第一部件区域上所施加的粘合剂5的照射强度更高。这样一来,在仅使用一个照射机构6对第一部件1或第三部件3的所有覆有粘合剂5的部件区域B1、B2进行照射的情况下,便为不同部件区域B1、B2内的粘合剂5实现不同程度的预固化。在该实施例中,较低的照射强度造成第一部件区域B1内的粘合剂5的预固化程度较低,以及,较高的照射强度造成第二部件区域B2内的粘合剂5的预固化程度较高。这导致预固化后第一部件区域B1内的粘合剂5的粘度比第二部件区域B2内的要低,亦即,第一部件区域B1内的粘合剂5的流动性,即液态程度比第二部件区域B2内的更高。通过此方式根据特定的需求及材料属性对粘合剂5的流变能力进行调整。
在第三方法步骤S3中,将第二部件2,即所述覆有催化剂的膜片布置到以上文所述方式覆有粘合剂5的第一部件1与以上文所述方式覆有粘合剂5的第三部件3之间,即所述框架元件之间,以便如图4所示地,在第四方法步骤S4中通过对粘合剂5的固化将部件1、2、3相互粘合。与图3类似,为清楚起见,图4同样仅局部示出部件1、2、3的横截面。
在以上文描述的方式对部件1、2、3进行布置后,所述两个框架元件,即第一部件1与第三部件3在第二部件区域B2内紧密贴靠在彼此上,并借助粘合剂5相互粘合。该第二部件区域B2内的粘合剂5具有较高的粘度,因而此时能防止粘合剂5因熔化而流失或流散。这样便提高了第一部件1和第三部件3上的粘合剂布置的几何精度和轮廓精度,这正是第二部件区域B2内所需要的,因为本实施例中构建的流入区域和/或流出区域是膜片-电机机构4的接合复合体中的无支撑式结构。
为对第二部件2进行紧固,在第一部件区域B1内布置有该第二部件2的,即所述覆有催化剂的膜片的边沿区域,以便可以借助粘合剂5将该边沿区域与第一部件1及第三部件3粘合。在该需要与所述覆有催化剂的膜片的边沿区域粘合的第一部件区域B1内,将膜电极单元4粘合后,除了对部件1、2、3的连接功能外,粘合剂5还具有密封功能,亦即,在此情形下粘合剂5构建一密封件,该密封件将所述覆有催化剂的膜片相对于由所述两个框架元件构成的框架密封,从而防止反应气体在所述两个框架元件间,即在第一部件1与第三部件3间穿过而侧漏。
为实现这一点,粘合剂5必须进入第二部件2的,即所述多孔的覆有催化剂的膜片的边沿区域,并从侧面将所述边沿区域完全包围,以及在该边沿区域内将所述覆有催化剂的膜片的顶面和底面足够地润湿,从而能够确保第二部件2与第一部件1及第三部件3的密封粘合。此外,为实现所需的密封效果,粘合剂5必须对所述覆有催化剂的膜片的边沿区域的不平整、粗糙且多孔的表面进行弥补,从而确保在该区域内在部件1、2、3间未留下开口。借助第一部件1和第三部件3的第一部件区域B1内的粘合剂5的较小粘度来实现并确保这一点。
上文已提及,尽管图2和3均仅示出第一部件1,但在上文描述的所述方法的实施方式中,以相同的方式为第一部件1和第三部件3,即为所述两个框架元件涂布粘合剂5,并以相同的方式对其进行预固化。而在所述方法的此处未绘示的其他实施方式中,也可以以不同的方式将粘合剂5施加到所述两个框架元件,即第一部件1和第三部件3上,和/或对粘合剂进行预固化。例如,在所述方法的另一此类实施方式中,在第三部件3上可以仅在第一部件区域B1内涂覆所述粘合剂,从而确保第三部件3与第二部件2的正常粘合。在此情形下,例如不在第三部件3的第二部件区域B2内涂覆所述粘合剂,因为在第一部件1的该第二部件区域B2内施加的粘合剂5已经足够用于将第一部件1和第三部件3,即所述两个框架元件可靠地相互粘合。
为使部件1、2、3相互完全粘合,从而构建膜电极单元4,重新借助用于实施所述方法的装置的照射机构6,对以上文所述及图4所示方式相互交叠布置的部件1、2、3进行照射,从而将粘合剂5完全固化。作为替代方案,也可以借助所述装置的另一此处未绘示的照射机构来实施上述操作,例如在用于对粘合剂5进行固化的辐射源需要与用于预固化的辐射源不同的情况下。在此情形下,例如可以用紫外线辐射实施所述预固化以及用红外线辐射实施所述固化,或者以相反的方式实施。在使用紫外线辐射和红外线辐射进行照射来实施固化的情况下,与所述预固化操作相似,也可以从紫外线辐射或红外线辐射开始先后或多次交替实施固化。此时,同样需要例如根据相应采用的粘合剂5和/或照射机构6中所采用的辐射源的功率来设定相应的照射持续时间。
为对粘合剂5进行光化学固化,至少第一部件1和/或第三部件3必须针对照射机构6所发射的辐射具有足够的透过度,亦即,在采用紫外线辐射和/或红外线辐射的情况下,这些部件针对相应辐射透明或至少足够半透明,以便这些辐射能到达粘合剂5,从而对该粘合剂进行固化。特别优选地,第一部件1和第三部件3均针对照射机构6所发射的辐射具有足够的透过度。
在图4所示的,将已用于对粘合剂5进行预固化的同一照射机构6用于对粘合剂5进行固化的实施例中,仅对示出的所述部件机构的一侧进行照射,以便借助粘合剂5的固化将部件1、2、3相互连接,从而完成对膜电极单元4的制造。但为对所述部件机构的所有区域内的粘合剂5进行最佳固化,也可以从两侧均执行照射,此时要么借助对所述部件机构和/或照射机构6进行重新定位来先后实施照射,要么同时实施。
但为实施同时照射,需要照射机构6在所述部件机构的两侧上,即布置有第一部件1的一侧上和布置有第二部件2的一侧上均具有相应的辐射源,或者,所述用于实施所述方法的装置具有两个照射机构6,以上文所述方式相互交叠布置的,构成图4所示部件机构的部件1、2、3需要布置在这两个照射机构间,以便对粘合剂5进行固化。
在图4所示实施例中,在第三部件3上,即在第三部件3与照射机构6之间重新布置有掩饰结构7。其中,在所示实施例中,该掩饰结构是已用于对第一部件1和第三部件3上的粘合剂5进行预固化的同一掩饰结构7。该掩饰结构7因而具有相同的作用,亦即,被照射机构6所发射的辐射较低程度地透过的第一掩饰区域7.1相对于照射机构6所发射的辐射同时覆盖了第一部件1和第三部件3的第一部件区域B1,以及,被照射机构6所发射的辐射较高程度地透过的第二掩饰区域7.2相对于照射机构6所发射的辐射同时覆盖了第一部件1和第三部件3的第二部件区域B2。
因此,作用于第二部件区域B2及该第二部件区域上所施加的粘合剂5的照射强度,比作用于第一部件区域B1及该第一部件区域上所施加的粘合剂5的照射强度更高。这样一来,在仅使用一个照射机构6对所有覆有粘合剂5的部件区域B1、B2进行照射的情况下,也能为不同部件区域B1、B2内的粘合剂5实现不同程度的固化。在该实施例中,较低的照射强度造成第一部件区域B1内的粘合剂5的固化程度较低,以及,较高的照射强度造成第二部件区域B2内的粘合剂5的固化程度较高。这样例如能在第一部件区域B1内,即在第二部件2与第一部件1及第三部件3的连接区域内防止过度固化以及例如避免粘合剂5的脆化,从而使粘合剂5保持预设的弹性,以便在该区域内确保所述粘合剂的密封功能。
作为替代方案,在所述方法的另一实施方式中,例如也可以采用以不同方式构建的另一掩饰结构,该掩饰结构具有针对照射机构6所发射的辐射的透过度各不相同的其他掩饰区域,从而以比第二部件区域B2内更高的照射强度对第一部件B1内的粘合剂5进行照射,以便将此前实施的对粘合剂5的不同预固化重新补偿来确保对粘合剂5的均匀固化,亦即,此时在第四方法步骤S4中对第一部件区域B1内的预固化程度较低的粘合剂5进行程度较高的固化,以及,在第四方法步骤S4中对第二部件区域B2内的预固化程度较高的粘合剂5进行程度较低的固化,从而使得固化完毕后所有部件区域B1、B2内的粘合剂5的最后稠度相同。
在图4所示实施例中,如上文所述,仅从一侧出发利用照射机构6对所述部件机构进行照射,因而仅该侧上布置有掩饰结构7。同样如上文所述的,如果需要采用替代方案从两侧对所述部件机构进行照射,且如果在两个照射操作中均需要使用这一掩饰结构7,则在所述部件机构的两侧各需要一个该掩饰结构7,或者可以先后对所述部件机构的两侧进行照射,这样一个掩饰结构7便已足够。在此情形下,仅需要将所述掩饰结构布置于所述部件机构的相应待照射侧与照射机构6之间。
附图标记表
1 第一部件
2 第二部件
3 第三部件
4 膜电极单元
5 粘合剂
6 照射机构
7 掩饰结构
7.1 第一掩饰区域
7.2 第二掩饰区域
A1 第一凹口
A2 第二凹口
B1 第一部件区域
B2 第二部件区域
S1 第一方法步骤
S2 第二方法步骤
S3 第三方法步骤
S4 第四方法步骤

Claims (11)

1.一种用于连接燃料电池的部件(1,2,3)的方法,其中,将液态的可光化学固化的粘合剂(5)至少局部施加到所述燃料电池的至少一个部件(1,2,3)上、进行光化学预固化、与所述燃料电池的至少另一部件(1,2,3)进行接触,以及进行固化,
其特征在于,对所述部件(1,2,3)的至少两个部件区域(B1,B2)内的所述可光化学固化的粘合剂(5)进行不同程度的光化学预固化。
2.根据权利要求1所述的方法,
其特征在于,将所述可光化学固化的粘合剂(5)至少局部施加到所述燃料电池的构建为膜电极单元(4)的第一框架元件的第一部件(1)上以及所述燃料电池的构建为所述膜电极单元(4)的第二框架元件的第三部件(3)上,其中,在对所述可光化学固化的粘合剂(5)进行过光化学预固化后,将所述燃料电池的构建为所述膜电极单元(4)的覆有催化剂的膜片的第二部件(2)定位在所述第一部件(1)与所述第三部件(3)之间,将所述三个部件(1,2,3)接合在一起,对可光化学固化的粘合剂(5)进行固化。
3.根据权利要求1或2所述的方法,其特征在于,用紫外线辐射和/或红外线辐射对可光化学固化的粘合剂(5)进行光化学预固化。
4.根据权利要求1或2所述的方法,其特征在于,对可光化学固化的粘合剂(5)进行光化学固化。
5.根据权利要求1或2所述的方法,其特征在于,在对可光化学固化的粘合剂(5)进行光化学预固化前,对覆有所述可光化学固化的粘合剂(5)的部件(1,2,3)进行掩饰:使得以不同的照射强度对至少两个部件区域(B1,B2)进行照射来实施对可光化学固化的粘合剂(5)的光化学预固化。
6.根据权利要求1或2的方法,其特征在于,利用丝网印刷将可光化学固化的粘合剂(5)施加到所述至少一个部件(1,2,3)上。
7.根据权利要求4所述的方法,其特征在于,用紫外线辐射和/或红外线辐射对可光化学固化的粘合剂(5)进行光化学固化。
8.一种用于连接燃料电池的部件(1,2,3)的装置,所述装置用于实施如权利要求1至7中任一项所述的方法,所述装置包括施加单元、照射机构(6)和掩饰结构(7),所述施加单元用于将液态的可光化学固化的粘合剂(5)至少局部施加到燃料电池的至少一个部件(1,2,3)上,所述照射机构用于对可光化学固化的粘合剂(5)进行光化学预固化,所述掩饰结构用于对燃料电池的覆有可光化学固化的粘合剂(5)的部件(1,2,3)进行至少局部的掩饰,使得以不同的照射强度对至少两个部件区域(B1,B2)进行照射来实施对可光化学固化的粘合剂(5)的光化学预固化。
9.根据权利要求8所述的装置,其特征在于,所述照射机构(6)具有至少一个构建为发光二极管的辐射源和/或至少一个管状辐射源。
10.根据权利要求9所述的装置,其特征在于,至少一个所述辐射源构建为发射紫外线辐射的辐射源和/或发射红外线辐射的辐射源。
11.根据权利要求8至10中任一项所述的装置,其特征在于,所述施加单元构建为丝网印刷单元。
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