WO2011120426A1 - 燃料电池用双极板 - Google Patents

燃料电池用双极板 Download PDF

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Publication number
WO2011120426A1
WO2011120426A1 PCT/CN2011/072272 CN2011072272W WO2011120426A1 WO 2011120426 A1 WO2011120426 A1 WO 2011120426A1 CN 2011072272 W CN2011072272 W CN 2011072272W WO 2011120426 A1 WO2011120426 A1 WO 2011120426A1
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WO
WIPO (PCT)
Prior art keywords
electrochemical reaction
reaction region
bipolar plate
fuel cell
spliced
Prior art date
Application number
PCT/CN2011/072272
Other languages
English (en)
French (fr)
Inventor
高勇
Original Assignee
上海恒劲动力科技有限公司
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Filing date
Publication date
Application filed by 上海恒劲动力科技有限公司 filed Critical 上海恒劲动力科技有限公司
Priority to EP11762000.5A priority Critical patent/EP2492997B1/en
Priority to US13/638,616 priority patent/US9231257B2/en
Publication of WO2011120426A1 publication Critical patent/WO2011120426A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0221—Organic resins; Organic polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0286—Processes for forming seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M2008/1095—Fuel cells with polymeric electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H01M8/242—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes comprising framed electrodes or intermediary frame-like gaskets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention belongs to the technical field of fuel cells, and particularly relates to a bipolar plate of a fuel cell.
  • a fuel cell is generally composed of a plurality of battery cells, each of which includes two electrodes (anode and cathode) which are separated by an electrolyte element and assembled in series with each other to form a fuel cell stack.
  • an appropriate reactant i.e., supplying one electrode with fuel and the other supplying an oxidant
  • an electrochemical reaction is achieved, thereby forming a potential difference between the electrodes, and thus generating electrical energy.
  • bipolar plates In order to supply reactants to each electrode, specific interface elements, commonly referred to as "bipolar plates" and disposed on either side of each individual cell, are used. These bipolar plates are typically in the form of a single component placed adjacent to the anode or cathode support. Bipolar plates are an important component of fuel cell stacks. During the operation of the fuel cell stack, the bipolar plate performs the following functions to maintain the optimal working state and service life of the fuel cell stack: (1) The battery conductor, the cathode anode is formed on both sides of the plate, and the battery cells are connected in series To form a fuel cell stack;
  • reaction gas mass transfer
  • the bipolar plate material needs to have high electrical conductivity, sufficient mechanical strength, good thermal conductivity, low gas permeability, corrosion resistance, and chemical stability for a considerable period of time in the battery operating environment.
  • the materials of the bipolar plates should also be lightweight, small in size, low in cost, and even require recyclability.
  • the materials used Due to the working environment of the electrochemical reaction of the fuel cell, the materials used must also be resistant to electrochemical corrosion and have good structural strength and stability. Therefore, in order to design a high-performance battery bipolar plate, various factors must be considered.
  • Materials commonly used in battery bipolar plates include: carbon plates, metal plates, and the like. Traditionally, the battery plates use carbon plates because of their good electrical conductivity, heat transfer and corrosion resistance. The reason for using the metal plate is that it has good electrical conductivity, structural strength and formability, and is also a good material for the electrode plate by surface anti-corrosion treatment.
  • a bipolar plate for a fuel cell comprising an electrochemical reaction zone and a non-electrochemical reaction zone, the electrochemical reaction zone and the non-electrochemical reaction zone being spliced and joined.
  • the electrochemical reaction zone is located in the middle, and the non-electrochemical reaction zone is located around the electrochemical reaction zone.
  • the material of the non-electrochemical reaction region is a non-conductive material.
  • the non-electrochemical reaction zone has a material density of 0.1 to 1.5 g per cubic centimeter. Further, the non-electrochemical reaction zone is provided with a reactant transport channel.
  • the non-electrochemical reaction region is provided with a mounting hole.
  • a portion of the electrochemical reaction region spliced with the non-electrochemical reaction region and a corresponding spliced portion of the non-electrochemical reaction region are thermocompression bonded.
  • a portion of the electrochemical reaction region spliced with the non-electrochemical reaction region is a stepped shape, and a spliced portion of the non-electrochemical reaction region is a corresponding inverted step shape.
  • a portion of the electrochemical reaction region spliced with the non-electrochemical reaction region is sawtooth, and a spliced portion of the non-electrochemical reaction region is a corresponding inverted zigzag shape.
  • a portion of the electrochemical reaction region spliced with the non-electrochemical reaction region is one or more protrusions, and a spliced portion of the non-electrochemical reaction region is a corresponding one or more grooves. Further, the portion of the electrochemical reaction region spliced with the non-electrochemical reaction region is one or more grooves, and the spliced portion of the non-electrochemical reaction region is a corresponding one or more protrusions.
  • annular groove is respectively disposed on the splicing side wall of the electrochemical reaction region and the non-electrochemical reaction region, and an annular sealing strip is disposed in the annular groove.
  • electrochemical reaction region and the non-electrochemical reaction region have the same thickness.
  • the invention divides the bipolar plate of the fuel cell into an electrochemical reaction region and a non-electrochemical reaction region, and each region is compositely spliced to form a complete bipolar plate, and a new type of fuel electricity is constructed by superposing such bipolar plates. Pool.
  • the design of the battery bipolar plate optimizes the conductivity of the plate, reducing losses, lifting/efficiency, while reducing material costs and simplifying the complexity of the production.
  • FIG. 1 is a schematic structural view of a first embodiment of a spliced bipolar plate of a fuel cell of the present invention
  • Figure 2 is a cross-sectional view along line A-A of the second embodiment of the spliced bipolar plate of the fuel cell of the present invention
  • Figure 3 is a cross-sectional view along line A-A of the third embodiment of the spliced bipolar plate of the fuel cell of the present invention.
  • Figure 4 is a cross-sectional view along line A-A of the fourth embodiment of the spliced bipolar plate of the fuel cell of the present invention.
  • Figure 5 is a cross-sectional view along line A-A of the fifth embodiment of the spliced bipolar plate of the fuel cell of the present invention. detailed description
  • a bipolar plate for a fuel cell the bipolar plate includes an electrochemical reaction region 1 and a non-electrochemical reaction region 2, and the electrochemical reaction region 1 and the non-electrochemical reaction region 2 are spliced and connected. .
  • the electrochemical reaction zone 1 described in the present invention refers to a region where a reaction between a fuel and an oxidant is generated, and the partial region corresponds to a proton exchange mode, a flow path directly contacting the proton exchange mode on the bipolar plate, a gas permeable layer, and the like. Usually there is a catalyst coating on the proton exchange module.
  • the non-electrochemical reaction zone 2 refers to a region where no electrochemical reaction occurs. The non-electrochemical reaction region 2 serves to support the electrochemical reaction region 1, and is subjected to external forces.
  • the invention can effectively reduce the design difficulty by separately designing the electrochemical reaction region 1 and the non-electrochemical reaction region 2 of the bipolar plate.
  • the bipolar plate material of the electrochemical reaction zone 1 can be made of a material that satisfies the bipolar plate of the fuel cell, such as a carbon plate, a metal plate, or the like.
  • the bipolar plate material of the non-electrochemical reaction region 2 can be made of an inexpensive and easy-to-machine material having a certain strength and heat resistance.
  • the electrochemical reaction region 1 is spliced and connected to the non-electrochemical reaction region 2 It can be used in the processing and production of this part, which effectively reduces the manufacturing cost. Even when the electrochemical reaction zone 1 is deactivated, the two partial regions can be separately recovered and reused. Make fuel cell stacks more environmentally friendly.
  • the material of the non-electrochemical reaction region 2 is a non-conductive material.
  • an insulating material such as ABS (a styrene-butadiene-acrylonitrile-based ternary copolymer) or PVC (polyvinyl chloride material)
  • a part of a material having a small density can be selected to produce the partial region, for example,
  • the material density of the non-electrochemical reaction zone 2 is from 0.1 to 1.5 g per cubic centimeter, and the person skilled in the art can flexibly select according to the needs.
  • the material of the partial region region can support the electrochemical reaction region 1, and withstand external forces, as well as insulation and the like. This can greatly reduce the weight of the fabricated fuel cell and further reduce energy consumption.
  • the reaction region and the non-reaction region around it are all of the same conductive material, which causes a part of the current generated by the reaction to pass through the non-reaction region of the periphery, forming an eddy current, causing a gradient of current gradient. This leads to the occurrence of current loss, which is likely to cause a reduction in the life of the fuel cell stack and even a current short circuit.
  • the present invention separates the electrochemical reaction region 1 and the non-electrochemical reaction region 2 of the bipolar plate, and fabricates the non-electrochemical reaction region 2 with an insulating material, so that the current can be uniformly from the electrochemical reaction region 2.
  • the generation of eddy current is avoided, the service life of the fuel cell stack is improved, the current short circuit is prevented from occurring, and the safety of the fuel cell is improved.
  • electrochemical reaction zone 1 is located in the middle, and the non-electrochemical reaction zone 2 is located in the periphery of the electrochemical reaction zone 1.
  • the non-electrochemical reaction zone 2 is provided with a reactant transport channel 4 communicating with the flow path of the electrochemical reaction zone 2.
  • This delivery channel 4 is used for reactant delivery in the electrochemical reaction zone 1.
  • the manner and structure of the communication between the specific transport path 4 and the flow path of the electrochemical reaction zone 2 can be achieved by various related techniques of the existing bipolar plates, and a detailed description of the same is omitted herein.
  • the non-electrochemical reaction region 2 is provided with a mounting hole 3 for fuel cell stack assembly.
  • the fuel cell bipolar plate provided by the present invention does not participate in the reaction due to the non-electrochemical reaction region 2, and the convenience material molding process, the cost is reduced, and the entire fuel cell material The weight is also greatly reduced, and there is no need to worry about damage to the bipolar plates during assembly, which reduces the assembly requirements of the fuel cell stack.
  • the portion of the electrochemical reaction region 1 spliced with the non-electrochemical reaction region 2 and the corresponding spliced portion of the non-electrochemical reaction region 2 may be designed to be bonded and extruded according to the manufacturing conditions. , hot pressing and other connection methods.
  • this embodiment is the same as the first embodiment except that the shape of the splicing portion is different.
  • 2 is a cross-sectional view taken along line AA of FIG. 1.
  • a portion where the electrochemical reaction region 1 and the non-electrochemical reaction region 2 are spliced is stepped, and a spliced portion of the non-electrochemical reaction region 2 corresponds to The inverted step shape.
  • this embodiment is the same as the first embodiment except that the shape of the splicing portion is different.
  • 3 is a cross-sectional view taken along line AA of FIG. 1.
  • a portion where the electrochemical reaction region 1 and the non-electrochemical reaction region 2 are spliced is zigzagged, and a spliced portion of the non-electrochemical reaction region 2 corresponds to The inverted zigzag shape.
  • this embodiment is the same as the first embodiment except that the shape of the splicing portion is different.
  • 4 is a cross-sectional view taken along line AA of FIG. 1, in which the portion where the electrochemical reaction region 1 and the non-electrochemical reaction region 2 are spliced is one or more protrusions, and the non-electrochemical reaction region 2
  • the splicing portion is a corresponding one or more grooves.
  • the portion of the electrochemical reaction region 1 spliced with the non-electrochemical reaction region 2 may be one or more grooves, and the spliced portion of the non-electrochemical reaction region 2 is one or more corresponding portions. Raised.
  • this embodiment is the same as the first embodiment except that the shape of the splicing portion is different.
  • 5 is a cross-sectional view taken along line AA of FIG. 1, in which the electrochemical reaction region 1 and the non-electrochemical reaction region 2 are respectively provided with an annular groove on the splicing side wall, and the annular groove is respectively disposed.
  • An annular sealing strip 5 is provided. The sealing of the spliced portion at the sealing strip 5 is achieved by the annular sealing strip.
  • the annular sealing strip 5 When installed, the annular sealing strip 5 may be first nested in the annular groove of the electrochemical reaction zone 1, and then the electrochemical reaction zone 1 is pressed into the non-electrochemical reaction zone 2.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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Description

燃料电池用双极板
技术领域
本发明属于燃料电池技术领域， 特别涉及燃料电池的双极板。
背景技术
燃料电池通常由多个电池单元构成，每个电池单元包括两个电极（阳极和阴 极）， 该两个电极被电解质元件隔开， 并且彼此串联地组装， 形成燃料电池堆。 通过给每个电极供给适当的反应物， 即给一个电极供给燃料而另一个供给氧化 剂， 实现电化学反应， 从而在电极之间形成电位差， 并且因此产生电能。
为了给每个电极供给反应物， 使用通常称为 "双极板"并且设置在每个单个 电池的两侧的特定界面元件。这些双极板通常是邻近阳极或阴极支撑体放置的单 个元件的形式。双极板是燃料电池组的重要元件。燃料电池堆在运行过程中， 双 极板执行如下功能以维持燃料电池堆的最佳工作状态以及使用寿命： （1 )电池导 电体， 极板两侧分别形成阴极阳极， 将一个个电池单元串联以组成燃料电池堆；
( 2)通过流道向电极提供反应气 （传质）； ( 3)协调水与热的管理， 防止冷却介 质及反应气体外漏； （4) 向膜电极组件 （MEA) 提供结构强度支持。
为完成上述功能， 双极板的材料需要具有高电导率、足够的机械强度、 良好 的热导、 气体透过率低、 抗腐蚀且能在电池工作环境中化学稳定相当长的时间。 此外， 考虑到设计与易于加工制造的需要， 双极板的材料还应该具备重量轻， 体 积小， 成本低廉， 甚至要求可回收利用等特征。
由于燃料电池的电化学反应的工作环境，采用的材料还必须耐电化学腐蚀并 具有良好的结构强度和稳定性。因此要设计一个高性能的电池的双极板， 必须充 分考虑各个方面的因素。 通常用于电池双极板的材料包括： 碳板、 金属板等。 传 统上电池极板使用碳板是因为其具有较好的导电、传热和防腐蚀性。而使用金属 板的原因在于， 其具有良好的导电性、 结构强度和成型性， 经表面抗腐蚀处理也 是作为电极板的好材料。
另外由于电池极板的制作费用高昂， 为降低燃料电池的成本， 燃料电池的设 计的努力方向之一就是寻求优化电池双极板的设计和制作方法。 发明内容
本发明的目的在于提供一种燃料电池用双极板，以优化现有燃料电池双极板 的设计。
本发明的目的可以通过以下技术方案来实现：
一种燃料电池用双极板，所述双极板包括电化学反应区域和非电化学反应区 域， 所述电化学反应区域和非电化学反应区域拼接连接。
进一步地，所述电化学反应区域位于中部， 所述非电化学反应区域位于所述 电化学反应区域周边。
进一步地， 所述非电化学反应区域的材料为非导电材料。
进一步地， 所述非电化学反应区域的材料密度为 0. 1至 1. 5克每立方厘米。 进一步地， 所述非电化学反应区域设有反应物输送通道。
进一步地， 所述非电化学反应区域设有安装孔。
进一步地，所述电化学反应区域与所述非电化学反应区域相拼接的部分和所 述非电化学反应区域的对应的拼接部分之间粘接连接。
进一步地，所述电化学反应区域与所述非电化学反应区域相拼接的部分和所 述非电化学反应区域的对应的拼接部分之间挤压连接。
进一步地，所述电化学反应区域与所述非电化学反应区域相拼接的部分和所 述非电化学反应区域的对应的拼接部分之间热压连接。
进一步地，所述电化学反应区域与所述非电化学反应区域相拼接的部分为台 阶形， 所述非电化学反应区域的拼接部分为对应的倒台阶形。
进一步地，所述电化学反应区域与所述非电化学反应区域相拼接的部分为锯 齿形， 所述非电化学反应区域的拼接部分为对应的倒锯齿形。
进一步地，所述电化学反应区域与所述非电化学反应区域相拼接的部分为一 个或多个凸起， 所述非电化学反应区域的拼接部分为对应的一个或多个凹槽。 进一步地，所述电化学反应区域与所述非电化学反应区域相拼接的部分为一 个或多个凹槽， 所述非电化学反应区域的拼接部分为对应的一个或多个凸起。
进一步地，所述电化学反应区域和所述非电化学反应区域相拼接侧壁上分别 对应设有一环状凹槽， 所述环状凹槽内设有一环状密封条。
进一步地， 所述电化学反应区域和非电化学反应区域的厚度相同。
本发明将燃料电池的双极板分成电化学反应区域和非电化学反应区域，各个 区域被复合拼接构成完整的双极板，用这样的双极板叠合而建造了新型的燃料电 池。 这柙电池双极板的设计， 优化 极板导电性能， 減少 损耗、 提鬲/效率， 同时有效降低材料成本和简化了制作的复杂性。
以下结合附图及实施例进一步说明本发明。 附图说明
图 1是本发明燃料电池的拼接双极板实施例一的结构示意图；
图 2是本发明燃料电池的拼接双极板实施例二的 A-A剖视图；
图 3是本发明燃料电池的拼接双极板实施例三的 A-A剖视图；
图 4是本发明燃料电池的拼接双极板实施例四的 A-A剖视图；
图 5是本发明燃料电池的拼接双极板实施例五的 A-A剖视图。 具体实施方式
实施例一
如图 1 所示， 一种燃料电池用双极板， 所述双极板包括电化学反应区域 1 和非电化学反应区域 2，所述电化学反应区域 1和非电化学反应区域 2拼接连接。
本发明中所述的电化学反应区域 1是指供给燃料和氧化剂发生反应的区域， 该部分区域对应于质子交换模、双极板上与质子交换模直接接触的流道、透气层 等部分，通常质子交换模上还具有催化剂涂层。而非电化学反应区域 2是指不发 生电化学反应的区域。 该非电化学反应区域 2用于支撑所述电化学反应区域 1， 承受外界的作用力。
本发明通过将双极板的电化学反应区域 1和非电化学反应区域 2分开设计， 可有效降低设计难度。例如， 所述电化学反应区域 1的双极板材料可采用满足燃 料电池双极板的材料制成， 如采用碳板、 金属板等。 而所述非电化学反应区域 2 的双极板材料可采用具有一定强度和耐热性能的廉价易于加工成型的材料制成， 组装时电化学反应区域 1拼接连接在该非电化学反应区域 2中即可，方便了该部 分的加工和制作， 有效降低制造成本。甚至在电化学反应区域 1失去效用时， 均 可分别回收该两部分区域， 并重新利用。 使燃料电池堆更加环保。
进一步地， 所述非电化学反应区域 2的材料为非导电材料。 例如 ABS (由苯 乙烯 -丁二烯-丙烯腈为基的三元共聚体）、 PVC (聚氯乙烯材料）等绝缘材料， 特 别是可以选择一些密度小的材料制作该部分区域， 例如所述非电化学反应区域 2 的材料密度为 0. 1至 1. 5克每立方厘米，本领域技术人员可以根据需要灵活选择 该部分区区域的材料， 只要该材料满足本发明中对该部分材料性能的要求即 RJ， 即可以支撑所述电化学反应区域 1， 并承受外界的作用力， 以及绝缘等特性。 这 样可以大幅减轻制成的燃料电池的重量，近一步降低能耗。现有燃料电池的双极 板中反应区域和其周边的非反应区域均为同一种导电材料，这使得反应产生的部 分电流从其周边的非反应区域通过， 形成涡流， 造成电流的梯度偏差， 导致电流 损耗现象的发生， 这种有害的电流现象容易造成燃料电池堆使用寿命的縮减， 甚 至发生电流短路。本发明通过将双极板的电化学反应区域 1和非电化学反应区域 2分开设计， 并采用绝缘材料制作所述非电化学反应区域 2， 这样可使电流均匀 地从电化学反应区域 2中通过，避免了涡流的产生， 提高了燃料电池堆的使用寿 命， 防止电流短路的发生， 提高了燃料电池使用的安全性。
其中，所述电化学反应区域 1位于中部， 所述非电化学反应区域 2位于所述 电化学反应区域 1周边。
其中，所述非电化学反应区域 2设有与所述电化学反应区域 2的流道相通的 反应物输送通道 4。 该输送通道 4用于电化学反应区域 1的反应物输送。 具体的 输送通道 4和所述电化学反应区域 2的流道之间的连通方式和结构可采用现有双 极板的多种相关技术实现， 在此省略对该部分的详细描述。
其中， 所述非电化学反应区域 2设有安装孔 3， 用于燃料电池堆组装。 与现 有整块设计的燃料电池双极板相比，本发明提供的燃料电池双极板， 由于非电化 学反应区域 2并不参与反应， 并且方便材成型加工， 成本下降， 整个燃料电池材 料重量也大幅下降， 不用担心组装时造成双极板的损坏， 降低了燃料电池堆的组 装要求。
其中，所述电化学反应区域 1与所述非电化学反应区域 2相拼接的部分和所 述非电化学反应区域 2的对应的拼接部分之间可以是根据制作条件设计成粘接、 挤压、 热压等连接方式。 实施例二
如图 2所示， 本实施例与实施例一除拼接部分形状不同外， 其它部分相同。 图 2是图 1的 A-A剖视图， 图 2中， 所述电化学反应区域 1与所述非电化学反应 区域 2相拼接的部分为台阶形，所述非电化学反应区域 2的拼接部分为对应的倒 台阶形。 买施例三
如图 3所示， 本实施例与实施例一除拼接部分形状不同外， 其它部分相同。 图 3是图 1的 A-A剖视图， 图 3中， 所述电化学反应区域 1与所述非电化学反应 区域 2相拼接的部分为锯齿形，所述非电化学反应区域 2的拼接部分为对应的倒 锯齿形。 实施例四
如图 4所示， 本实施例与实施例一除拼接部分形状不同外， 其它部分相同。 图 4是图 1的 A-A剖视图， 图 4中， 所述电化学反应区域 1与所述非电化学反应 区域 2相拼接的部分为一个或多个凸起，所述非电化学反应区域 2的拼接部分为 对应的一个或多个凹槽。
也可以是，所述电化学反应区域 1与所述非电化学反应区域 2相拼接的部分 为一个或多个凹槽，所述非电化学反应区域 2的拼接部分为对应的一个或多个凸 起。 实施例五
如图 5所示， 本实施例与实施例一除拼接部分形状不同外， 其它部分相同。 图 5是图 1的 A-A剖视图， 图 5中， 所述电化学反应区域 1和所述非电化学反应 区域 2相拼接侧壁上分别对应设有一环状凹槽，所述环状凹槽内设有一环状密封 条 5。 通过该环状密封条实现拼接部分在密封条 5处的密封。
安装时， 可先将环状密封条 5嵌套在所述电化学反应区域 1的环状凹槽内， 然后将所述电化学反应区域 1压入所述非电化学反应区域 2中。
以上所述的实施例仅用于说明本发明的技术思想及特点，其目的在于使本领 域内的技术人员能够了解本发明的内容并据以实施，不能仅以本实施例来限定本 发明的专利范围，例如采用其它拼接方式实现所述电化学反应区域 1和所述非电 化学反应区域 2的连接，只要双极板采用电化学反应区域和非电化学反应区域分 开设计， 任何其它等同变化或修饰， 均落在本发明的专利范围之内。

Claims

权利要求
1、 一种燃料电池用双极板， 其特征在于： 所述双极板包括电化学反应区域 和非电化学反应区域， 所述电化学反应区域和非电化学反应区域拼接连接。
2、 根据权利要求 1所述的燃料电池用双极板， 其特征在于： 所述电化学反 应区域位于中部， 所述非电化学反应区域位于所述电化学反应区域周边。
3、 根据权利要求 2所述的燃料电池用双极板， 其特征在于： 所述非电化学 反应区域的材料为非导电材料。
4、 根据权利要求 3所述的燃料电池用双极板， 其特征在于： 所述非电化学 反应区域的材料密度为 0. 1至 1. 5克每立方厘米。
5、 根据权利要求 4所述的燃料电池用双极板， 其特征在于： 所述非电化学 反应区域设有反应物输送通道。
6、 根据权利要求 1至 5中任一权利要求所述的燃料电池用双极板， 其特征 在于： 所述非电化学反应区域设有安装孔。
7、 根据权利要求 6所述的燃料电池用双极板， 其特征在于： 所述电化学反 应区域与所述非电化学反应区域相拼接的部分和所述非电化学反应区域的对应 的拼接部分之间粘接连接。
8、 根据权利要求 6所述的燃料电池用双极板， 其特征在于： 所述电化学反 应区域与所述非电化学反应区域相拼接的部分和所述非电化学反应区域的对应 的拼接部分之间挤压连接。
9、 根据权利要求 6所述的燃料电池用双极板， 其特征在于： 所述电化学反 应区域与所述非电化学反应区域相拼接的部分和所述非电化学反应区域的对应 的拼接部分之间热压连接。
10、根据权利要求 1至 5及 7至 9中任一权利要求所述的燃料电池用双极板， 其特征在于：所述电化学反应区域与所述非电化学反应区域相拼接的部分为台阶 形， 所述非电化学反应区域的拼接部分为对应的倒台阶形。
11、根据权利要求 1至 5及 7至 9中任一权利要求所述的燃料电池用双极板， 其特征在于：所述电化学反应区域与所述非电化学反应区域相拼接的部分为锯齿 形， 所述非电化学反应区域的拼接部分为对应的倒锯齿形。
12、根据权利要求 1至 5及 7至 9中任一权利要求所述的燃料电池用双极板， 其特征在于：所述电化学反应区域与所述非电化学反应区域相拼接的部分为一个 或多个凸起， 所述非电化学反应区域的拼接部分为对应的一个或多个凹槽。
13、根据权利要求 1至 5及 7至 9中任一权利要求所述的燃料电池用双极板， 其特征在于：所述电化学反应区域与所述非电化学反应区域相拼接的部分为一个 或多个凹槽， 所述非电化学反应区域的拼接部分为对应的一个或多个凸起。
14、根据权利要求 1至 5及 7至 9中任一权利要求所述的燃料电池用双极板， 其特征在于：所述电化学反应区域和所述非电化学反应区域相拼接侧壁上分别对 应设有一环状凹槽， 所述环状凹槽内设有一环状密封条。
15、根据权利要求 1至 5及 7至 9中任一权利要求所述的燃料电池用双极板， 其特征在于： 所述电化学反应区域和非电化学反应区域的厚度相同。
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