1338405 099年09月09日後正替换頁 六、發明說明： 【發明所屬之技術領域】 _本發明係關於-種燃料電池，尤指一種用於質子交換膜 燃料電池之密封結構。 【先前技術】 _2]燃'料電池係一種電化學發電裝置，其將燃料及氧化劑轉 化為電能並產生反應產物。相對於純電池、經電池等 其他電池系統，燃料電池具有能量轉換效率高、對環境 Φ 污染小 '適用廣 '無嗓音及連續工作等優點，廣泛應用 於軍事、國防及民用之電力、汽車、通信等多種領域。 _3]燃料電池通常可分為崎㈣料電池、㈣氧化物燃料電 池、以及質子交換_料電池等。其巾，f手交換膜燃 料電池近年來發展迅迷，世人矚目。通常，一個單獨的 質子父換膜燃料電池單元主要包括膜電極（Membrane Electrode Assembly，簡稱MEA)，導流板（F1〇w Field Plate’ 簡稱 Mp)以及集流板（Current Cc^_ • lector Plate)等組成邹分。 國膜電極（MEA)亦稱膜電植組，係電池單元之核心部件，燃 料氣體（氮氣）及氧化劑（純氧或含氧氣之空氣）在此發生 電化學反應，釋放電子並產生水。膜電極一般係由一張 質子交換膜（Proton Exchange Membrane)、分別夾在 質子交換膜之兩表面的兩片多孔性導電層（分別為陽極與 陰極）組成。質子交換膜係由質子傳導材料製成，先前技 術中有採用例如全氟績酸型膜、聚笨乙歸續酸型膜、聚 三氟笨乙稀項酸型膜、盼搭樹脂績酸型膜、破氫化合物 094120206 表單編號A0101 第3頁/共22頁 0993323504-0 B38405 099年09月09日按正替换頁 膜、高爾膜等作為質子交換膜。多孔性導電層一般係由 導電材料製成，例如破紙（Carbon Paper)，其至少一表 面具有多孔結構的襯底，並在該多孔結構的襯底上形成 有電催化層（Electrocatalyst Layer)。先前技術中， 電催化層包含有電催化顆粒及質子傳導顆粒之混合物， 其中該電催化顆粒一般包含導電顆粒（典型為碳顆粒）及 催化劑顆粒（貴金屬，包括始、金、4了或其合金等）。 [0005] 導流板（FFP)亦稱為流床板、隔板，一般係由導電材料製 成’例如石墨、導電塑料、金屬專打料。在每個電池早 元中’膜電極（Μ E A)係炎在兩塊導流板中間’在每個導流 板與膜電極相接觸之表面藉由壓鑄、沖塵或機械銑刻等 方法形成有一條或複數條導流推，該專流槽;分別用於導 引燃料氣體、氧化劑或反應產物水。這些導流槽既可用 作燃料與氧化劑進入陽極、陰極表面之通道，同時用作 帶走燃料電池運行時產生的水的通道。實際應用時，為 提高燃料電池總功率，複數燃料電池單元可通過疊加方 •式串聯構成電池組，此時一塊導流板之兩表面均可形成 春 有導流槽，分別用作一個膜電極之陽極導流面，以及另 一個膜電極之陰極導流面，這種雙面均有導流槽之導流 板又可稱為雙極板。 [0006] 集流板一般係導電材料製成，在一個電池單元中通常採 用兩塊集流板分別夾在兩塊流道板未形成導流槽之另一 表面。由於導流板本身亦具有導電性，故，先前技術中 亦有省略集流板之設計，直接以導流板兼作集流板之用 094120206 表單編號A0101 第4頁/共22頁 0993323504-0 099年09月09日按正替换頁 [0007] 以下對質子交換膜燃料電池之反應機理作簡單描述。 [0008] 質子交換膜燃料電池採用氫氣為燃料，氧氣或空氣為氧 化劑。在陽極區，氫氣在催化劑作用下發生催化化學反 應產生氫正離子（質子），並釋放出電子；質子通過質子 交換膜遷移至陰極區。在陰極區，氧氣在與遷移過來的 質子發生反應生成產物水。反應表達式如下： [0009] 陽極反應：H2(2H + + 2e [0010] 陰極反應：l/202 + 2H + + 2e(H20 [0011] 在燃料電池運行過程中，陽極及陰極對應之導流板起到 均勻分散氫氣及氧氣之作用，使得氫氣及氧氣可均勻分 散於膜電極兩表面，並分別在催化劑作用下發生催化反 應。如上所述，為能使氣體分散均勻，一般導流板與膜 電極接觸之表面形成有至少一條彎曲延伸的導流槽，以 利燃料沿此導流槽流經整個或大部分表面。 [0012] 為了確保燃料與氧化劑氣體可以分佈至整個膜電極兩邊 表面上並且不會產生混和，膜電極兩邊的密封結構非常 關鍵。如果密封不好，將會產生非常危險的後果：燃料 氣體與氧化劑氣體在燃料電池内部發生混和，一旦發生 爆炸，破壞力非常大；或者燃料氣體與氧化劑氣體泄露 至燃料電池外部，這樣會造成電池性能下降，隨著泄露 的氣體越來越多，濃度累積到一定程度時亦會發生爆炸 〇 [0013] 目前已有的密封技術有膠密封：將導流板或雙極板與膜 電極藉由密封膠粘接密封為一體。此密封技術組裝方便 表單編號A010】 第5頁/共22頁 0993323504-0 13384051338405 Replacement page after September 09, 099. VI. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a fuel cell, and more particularly to a sealing structure for a proton exchange membrane fuel cell. [Prior Art] _2] A fuel cell is an electrochemical power generation device that converts fuel and oxidant into electrical energy and produces a reaction product. Compared with other battery systems such as pure batteries and batteries, fuel cells have the advantages of high energy conversion efficiency, low pollution to the environment Φ, wide application, no noise and continuous operation, and are widely used in military, national defense and civil power, automobiles, Communication and other fields. _3] Fuel cells can be generally classified into Saki (four) battery, (4) Oxide fuel battery, and Proton exchange battery. Its towel, f-hand exchange membrane fuel cell has developed rapidly in recent years, and the world has attracted attention. Usually, a single proton parent exchange membrane fuel cell unit mainly includes Membrane Electrode Assembly (MEA), deflector (F1〇w Field Plate) and current collector plate (Current Cc^_ • lector Plate) ) and so on. The Membrane Electrode (MEA), also known as the membrane electrophoresis group, is the core component of the battery unit. The fuel gas (nitrogen) and the oxidant (pure oxygen or oxygen-containing air) react electrochemically here to release electrons and produce water. The membrane electrode is generally composed of a proton exchange membrane (Proton Exchange Membrane), two porous conductive layers (anode and cathode, respectively) sandwiched between the two surfaces of the proton exchange membrane. The proton exchange membrane is made of a proton conductive material, and in the prior art, for example, a perfluorinated acid type membrane, a polystyrene-retained acid membrane, a polytrifluoroethylene acid type membrane, and a resin type Membrane, hydrogen-depleting compound 094120206 Form No. A0101 Page 3 of 22 0993323504-0 B38405 On September 09, 099, the membrane, Gol film, etc. were replaced as proton exchange membranes. The porous conductive layer is generally made of a conductive material, such as a carbon paper, having at least one substrate having a porous structure, and an electrocatalyst layer formed on the substrate of the porous structure. In the prior art, the electrocatalytic layer comprises a mixture of electrocatalytic particles and proton conducting particles, wherein the electrocatalytic particles generally comprise conductive particles (typically carbon particles) and catalyst particles (precious metals, including primary, gold, 4 or alloys thereof). Wait). [0005] The deflector (FFP), also known as a flow bed plate, a separator, is generally made of a conductive material such as graphite, conductive plastic, or metal. In each battery cell, the membrane electrode (ΜEA) is in the middle of the two baffles, and the surface of each baffle that is in contact with the membrane electrode is formed by die casting, dusting or mechanical milling. There is one or a plurality of diversions, which are used to guide the fuel gas, the oxidant or the reaction product water, respectively. These channels can be used both as a conduit for fuel and oxidant to enter the anode and cathode surfaces, and as a conduit for carrying water from the fuel cell during operation. In practical application, in order to increase the total power of the fuel cell, the plurality of fuel cell units can be connected in series by a stacked type, and at this time, both surfaces of one baffle can form a spring diversion groove, which is used as a membrane electrode respectively. The anode flow guiding surface and the cathode current guiding surface of the other membrane electrode, and the baffle having the guiding groove on both sides can also be called a bipolar plate. [0006] The current collecting plate is generally made of a conductive material, and two current collecting plates are usually sandwiched between one of the two flow path plates and the other surface of the flow path plate. Since the baffle itself is also electrically conductive, the design of the current collecting plate is omitted in the prior art, and the baffle is used as the current collecting plate directly. 094120206 Form No. A0101 Page 4 / Total 22 Page 0993323504-0 099 September 09, according to the replacement page [0007] The following is a brief description of the reaction mechanism of the proton exchange membrane fuel cell. [0008] A proton exchange membrane fuel cell uses hydrogen as a fuel, and oxygen or air as an oxidant. In the anode region, hydrogen undergoes a catalytic chemical reaction under the action of a catalyst to generate hydrogen cations (protons) and emits electrons; protons migrate through the proton exchange membrane to the cathode region. In the cathode region, oxygen reacts with the migrated protons to form product water. The reaction expression is as follows: [0009] Anode reaction: H2 (2H + + 2e [0010] Cathodic reaction: l/202 + 2H + + 2e (H20 [0011] The anode and cathode corresponding flow during the operation of the fuel cell The plate acts to uniformly disperse hydrogen and oxygen, so that hydrogen and oxygen can be uniformly dispersed on both surfaces of the membrane electrode, and respectively undergo catalytic reaction under the action of the catalyst. As described above, in order to make the gas dispersion uniform, the general baffle plate and The surface of the membrane electrode contact is formed with at least one curvedly extending flow guiding groove for the fuel to flow through the entire or most of the surface along the flow guiding groove. [0012] To ensure that the fuel and oxidant gas can be distributed to both surfaces of the entire membrane electrode And there is no mixing, and the sealing structure on both sides of the membrane electrode is very critical. If the sealing is not good, there will be very dangerous consequences: the fuel gas and the oxidant gas are mixed inside the fuel cell, and once the explosion occurs, the destructive force is very large; or Fuel gas and oxidant gas leak to the outside of the fuel cell, which will cause the battery performance to decrease, with more and more leaked gas When the concentration is accumulated to a certain extent, an explosion will occur. [0013] The existing sealing technology has a rubber seal: the baffle or the bipolar plate is bonded to the membrane electrode by a sealant. The sealing technology is assembled. Convenient Form No. A010] Page 5 of 22 Page 0993323504-0 1338405
099年09月09¾^正替換頁I ，簡單易行；惟，由於燃料電池運行時溫度較高（一般 為200至400度），密封膠容易於高溫環境中產生氣泡或 高溫老化，從而使得密封失效。 [0014] 另一種密封結構係平板墊圈密封：如第一圖所示，先前 技術燃料電池10的主要結構包括膜電極u ;二塊導流板 13 ’分別將膜電極11失於其中；二塊墊片12，分別夹於 一導流板13與膜電極11之間；以及二塊集電板1 4。各導 流板13面對膜電極11之表面設有流道丨3〇以提供燃料氣體 或氧化劑氣體流動、分散之通道，各流流板13與臈電極 · 11之間的密封係藉由墊片12來實現，各墊片12中央部分 挖空形成開口 1 21，其位置與流道1 3 〇所在區;域相應，其 面積較流道13 0分佈區域稍大:而較.整.個導濟:权1 3面積稍小 或相同。如前所述，膜電極11 一般包括質子交換膜及二 片多孔性導電層（如碳紙），在此密封結構中，為防止 二片多孔性導電層之間發生短路，質子交換膜之面積應 大於多孔性導電層（圖未示）。封裝時，二塊導流板以及 墊片12將膜電極11緊夾於令間，二墊片12邊框將露出外 馨 面的質子交換膜及多孔性導電層壓緊，而流動於流道13〇 之燃料氣體及氧化劑氣體仍可由塾片12之開口 121擴散至 膜電極，如此，藉由二塊墊片12之密封作用防止燃料氣 體或氧化劑氣體泄漏。 [0015] 惟’上述密封結構密封效果較差，例如當塾片12與導流 板13之表面未能完全配合時，氣體仍有可能由二者之間 的間隙泄漏。另外，上述密封結構需二塊备片，使得其 元件數量較多，結構亦複雜。 094120206 表單編號A0101 笫6頁/共22頁 0993323504-0 099年09月09日按正替换頁September 09, 093⁄4^ is replacing page I, which is simple and easy; however, because the fuel cell operates at a relatively high temperature (typically 200 to 400 degrees), the sealant is prone to bubble or high temperature aging in high temperature environments, thus making the seal Invalid. [0014] Another sealing structure is a flat gasket seal: as shown in the first figure, the main structure of the prior art fuel cell 10 includes a membrane electrode u; the two baffles 13' respectively lose the membrane electrode 11 therein; The spacers 12 are respectively sandwiched between a deflector 13 and the membrane electrode 11; and two collector plates 14 are disposed. Each of the baffles 13 is provided with a flow channel 面对3〇 facing the surface of the membrane electrode 11 to provide a passage for the flow or dispersion of the fuel gas or the oxidant gas, and the seal between each flow plate 13 and the ruthenium electrode 11 is by a pad. The sheet 12 is realized, and the central portion of each spacer 12 is hollowed out to form an opening 1 21, the position of which is corresponding to the area where the flow channel 13 3 is located; the area is slightly larger than the distribution area of the flow channel 13 0: Guide: Right 1 3 area is slightly smaller or the same. As described above, the membrane electrode 11 generally includes a proton exchange membrane and two porous conductive layers (e.g., carbon paper). In this sealing structure, in order to prevent short circuit between the two porous conductive layers, the area of the proton exchange membrane It should be larger than the porous conductive layer (not shown). When encapsulating, the two baffles and the spacers 12 clamp the membrane electrode 11 between the remnants, and the two spacers 12 will expose the outer surface of the proton exchange membrane and the porous conductive laminate, and flow to the flow channel 13 The fuel gas and the oxidant gas of the crucible can still be diffused from the opening 121 of the crucible 12 to the membrane electrode, so that the leakage of the fuel gas or the oxidant gas is prevented by the sealing action of the two gaskets 12. [0015] However, the sealing structure described above is inferior in sealing effect. For example, when the surface of the dam piece 12 and the deflector 13 are not completely fitted, the gas may still leak from the gap therebetween. In addition, the above sealing structure requires two spare pieces, so that the number of components is large and the structure is complicated. 094120206 Form No. A0101 笫6 pages/Total 22 pages 0993323504-0 September 9, 2009 Press the replacement page
[0016] 因此，提供一種可提高氣密性、防止燃料氣體泄漏，且 結構簡單之燃料電池密封結構實為必要。 【發明内容】 [0017] 以下將通過若干實施例說明一種具有優良氣密性、可防 止燃料氣體泄漏，且結構簡單容易實現之燃料電池密封 結構。 [0018] 為實現上述内容，提供一種燃料電池密封結構，其包括 :第一導流板及第二導流板；一膜電極組，設置於該第 一及第二導流板之間；及一密封墊圈；其中，該第一導 流板具有一面對該膜電極組之表面，該表面開設有與該 密封墊圈相配之凹槽；該膜電極組之邊緣部分彎折伸入 該凹槽内，該密封墊圈設於該膜電桉組之邊緣部分外側 ，當第一導流板及第二導流板壓緊夾持該膜電極組時， 該密封墊圈置於該凹槽内，與第二導流板形成抵靠並將 該膜電極組之邊緣部分抵靠於該凹槽側壁形成密封。 [0019] 其中，該密封墊圈之厚度校該凹槽深度稍大；該密封墊 圈係由絕緣彈性材料製成；該密封墊圈之形狀與該凹槽 相配。 [0020] 另一實施例中，該膜電極組之邊緣部分置於該凹槽内； 該密封墊圈設於該膜電極組之邊緣部分外側，從而將該 邊緣部分抵靠於凹槽侧壁形成夾持。 » [0021] 再一實施例t，該第二導流板具有一面對膜電極組之表 面，該表面進一步具有對應該凹槽之凸起；該凸起於封 裝時透過膜電極組將墊圈抵靠於該凹槽形成密封。 表單編號A0101 第7頁/共22頁 0993323504-0 1338405 099年09月09日梭正替換頁 [0022] 又一實施例中，該第二導流板面對該膜電極組之表面進 一步開設有另一凹槽，以及進一步包括與該另一凹槽相 配之另一密封墊圈。當第一導流板及第二導流板壓緊夾 持該膜電極組時，該密封墊圈及另一密封墊圈互相抵靠 並夾持該膜電極組從而形成密封。 [0023] 相較於先前技術，本技術方案之優點在於：由於至少一 導流板表面開設有密封凹槽，並提供與之相配合之墊圈 ，當二導流板將膜電極組夾持於其中，則墊圈抵靠膜電 極組提供彈性密封，從而提高密封效果；另一導流板亦 4 可形成相應之凸起或另一凹槽並配以另一墊圈，可進一 步提高密封效果；另外，本技方案結;構簡單，容易實 .... ..:-17 現。 【實施方式】 [0024] 以下結合圖式以及具體實施方式詳細說明本發明技術方 案之内容。 [0025] 請參閱第二圖及第三圖，本發明第一實施例之燃料電池 密封結構20包括：膜電極組22，上導流板26及下導流板 24將該膜電極組22夾於中間。其中，膜電極組22係燃料 電池重要核心元件之一，發生電化學反應產生電能之場 所。根據不同功能需要，膜電極組可有不同結構。一般 而言，膜電極組22包括有質子交換膜及位於兩側之陰極 電極與陽極電極。 [0026] 上導流板26與下導流板24面對膜電極組22之内側表面分 別具有一條或複數條導流槽243，以利於燃料氣體或氧化 劑氣體均勻分佈，另外亦可用於將反應產生的水導出。 094120206 表單編號A0101 第8頁/共22頁 0993323504-0 1338405 099年09月09日後正替換頁 導流槽243分佈之區域可稱為導流床。一凹槽241圍繞該 導流床形成在下導流板24表面，如第三圖所示，凹槽241 之截面為方形，當然，亦可為圓形、梯形等其他形狀。 上導流板26則並示形成有凹槽。該上導流板26及下導流 板24可由石墨、金屬或導電性複合材料製成。 [0027] 密封結構20還包括一墊圈28，其具有與該凹槽241相配合 之形狀及尺寸。本實施例中，墊圈28具有方形截面，其 高度較凹槽241之深度稍大。當然亦可採用其他截面形狀 之墊圈，如圓形、梯形等。該墊圈28採用絕緣材料，最 好由耐熱、彈性材料製成，以適應燃料電池之工作溫度 並能提供彈性，例如可採用聚胺脂、橡膠任何具有彈性 且能適應燃料電池工作溫度之絕緣材料等。 [0028] 封裝時，該墊圈28可置於該凹槽241内，並因其高度較凹 槽241深度大，頂部稍有突出下導流板24之表面。膜電極 組22則放置於下導流板24與上導流板26之間，當上導流 板26與下導流板24夾緊時，墊圈28被擠壓並發生彈性變 形，墊圈28兩側分別抵靠於凹槽241與膜電極組22，並進 而將膜電極組22抵靠於上導流板26形成夾持，從而可防 止燃料氣體或氡化劑氣體由上導流板26或下導流板24内 側之導流槽243泄漏出來。相較於先前技術之密封方式， 本實施例密封結構可節省元件，僅需一塊密封墊圈即可 ，結構簡單；墊圈與凹槽相互配合，容易對準、安裝， 而且密封效果好。 [0029] 應當注意，上述僅描述燃料電池之膜電極組與導流板之 間構成之密封結構，實際上應用時燃料電池還可包括其 094120206 表單編號A0101 第9頁/共22頁 0993323504-0 1338405 099年09月09日按正替换頁 他元件，包括先前技術所描述之集電板，以及燃料/氧化 劑輸送系統等，在此不再贅述。 [0030] 請參閱第四圖，本發明第二實施例之密封結構與第一實 施例結構基本相同，主要包括：膜電極組22，上導流板 26及下導流板24將該膜電極組22夾於中間。上導流板26 與下導流板24面對膜電極組22之内側表面分別具有一條 或複數條導流槽263及243，以利於燃料氣體或氧化劑氣 體均勻分佈，另外亦可用於將反應產生的水導出。導流 槽243，263分佈之區域可稱為導流床。一凹槽241圍繞 · 該導流床形成在下導流板24表面，如圖所示，凹槽241之 戴面為方形，當然，亦可為圓形、梯形等其他形狀。該 上導流板26及下導流板24可由石墨、金屈或導電性複合 材料製成。 [0031] 密封結構還包括一墊圈28，其具有與該凹槽241相配合之 形狀，且其截面寬度較凹槽241寬度稍小或相同。本實施 例中，墊圈28具有方形載面，其高度較凹槽241之深度稍 大。當然亦可採用其他截面形狀之墊圈，如圓形、梯形 < 等。該墊圈28採用絕緣材料，最好由耐熱、彈性材料製 成，以適應燃料電池之工作溫度並能提供彈性，例如可 採用聚胺脂、橡膠任何具有彈性且能適應燃料電池工作 溫度之絕緣材料等。 [0032] 封裝時，膜電極組22之邊緣部分221彎折伸入該凹槽241 内，但其末端並未與下導流板24接觸，以防止短路；墊 圈28亦置於該凹槽241内並位於膜電極組22邊緣部分221 之外側，其頂部較下導流板24表面稍有突出。膜電極組 094120206 表單編號A0101 第10頁/共22頁 0993323504-0 1338405 099年09月09日後正替换頁 22中間主體部分則放置於下導流板24與上導流板26之間 ’當上導流板26與下導流板24夾緊時，上導流板26向凹 槽241内擠壓墊圈28，使墊圈28發生彈性變形從而將伸入 凹槽241内之膜電極組22邊緣部分221抵靠於凹槽241側 壁形成夾持，另外，墊圈28頂部與上導流板26形成抵靠 ’藉此構成密封，從而可防止燃料氣體或氧化劑氣體由 上導流板26或下導流板24内側之導流槽243泄漏出來。[0016] Therefore, it is necessary to provide a fuel cell sealing structure which can improve airtightness, prevent fuel gas leakage, and has a simple structure. SUMMARY OF THE INVENTION [0017] Hereinafter, a fuel cell sealing structure having excellent airtightness, preventing fuel gas leakage, and having a simple and easy structure can be described by way of several embodiments. [0018] In order to achieve the above, a fuel cell sealing structure is provided, comprising: a first baffle and a second baffle; a membrane electrode set disposed between the first and second baffles; a sealing gasket; wherein the first baffle has a surface facing the membrane electrode assembly, the surface is provided with a groove matching the sealing gasket; an edge portion of the membrane electrode group is bent and extends into the groove The sealing gasket is disposed outside the edge portion of the membrane electrode set. When the first deflector and the second deflector are pressed to clamp the membrane electrode assembly, the sealing gasket is placed in the groove, and The second baffle is formed against and the edge portion of the membrane electrode set abuts against the groove sidewall to form a seal. [0019] wherein the thickness of the sealing gasket is slightly larger than the depth of the groove; the gasket is made of an insulating elastic material; the shape of the sealing gasket matches the groove. [0020] In another embodiment, an edge portion of the membrane electrode assembly is disposed in the recess; the sealing gasket is disposed outside the edge portion of the membrane electrode assembly, thereby forming the edge portion against the sidewall of the recess. Clamping. [0021] In still another embodiment t, the second baffle has a surface facing the membrane electrode set, the surface further having a protrusion corresponding to the groove; the protrusion is a gasket passing through the membrane electrode group during packaging A seal is formed against the groove. Form No. A0101 Page 7 / Total 22 Page 0993323504-0 1338405 September 09, 0999 Shuttle Replacement Page [0022] In still another embodiment, the second baffle is further disposed facing the surface of the membrane electrode assembly Another groove, and further comprising another sealing gasket that mates with the other groove. When the first baffle and the second baffle are pressed against the membrane electrode assembly, the sealing gasket and the other sealing gasket abut against each other and sandwich the membrane electrode assembly to form a seal. [0023] Compared with the prior art, the technical solution has the advantages that: at least one of the baffle surfaces is provided with a sealing groove, and a matching gasket is provided, when the two baffles sandwich the membrane electrode assembly Wherein, the gasket provides an elastic seal against the membrane electrode assembly to improve the sealing effect; the other baffle 4 can form a corresponding protrusion or another groove and is equipped with another gasket to further improve the sealing effect; , the technical solution knot; simple construction, easy to live .....: -17 now. [Embodiment] The contents of the technical scheme of the present invention will be described in detail below with reference to the drawings and specific embodiments. Referring to the second and third figures, the fuel cell sealing structure 20 of the first embodiment of the present invention includes: a membrane electrode assembly 22, an upper baffle 26 and a lower baffle 24 sandwiching the membrane electrode assembly 22 In the middle. Among them, the membrane electrode group 22 is one of the important core components of the fuel cell, and an electrochemical reaction occurs to generate electric energy. The membrane electrode assembly can have different structures depending on the needs of the different functions. In general, membrane electrode assembly 22 includes a proton exchange membrane and cathode and anode electrodes on either side. [0026] The inner surface of the upper baffle 26 and the lower baffle 24 facing the membrane electrode assembly 22 respectively have one or a plurality of flow guiding grooves 243 to facilitate uniform distribution of fuel gas or oxidant gas, and may also be used for reacting The resulting water is exported. 094120206 Form No. A0101 Page 8 of 22 0993323504-0 1338405 Replacement page after September 09, 099 The area in which the guide groove 243 is distributed may be referred to as a guide bed. A groove 241 is formed around the guide bed on the surface of the lower baffle 24. As shown in the third figure, the groove 241 has a square cross section, and may of course be circular, trapezoidal or the like. The upper baffle 26 is also shown with a groove. The upper baffle 26 and the lower baffle 24 may be made of graphite, metal or a conductive composite material. [0027] The sealing structure 20 also includes a washer 28 having a shape and size that cooperates with the recess 241. In the present embodiment, the washer 28 has a square cross section whose height is slightly larger than the depth of the recess 241. It is of course also possible to use gaskets of other cross-sectional shapes, such as circular, trapezoidal and the like. The gasket 28 is made of an insulating material, preferably made of a heat-resistant and elastic material, to adapt to the operating temperature of the fuel cell and to provide elasticity. For example, polyurethane, rubber, any insulating material capable of adapting to the operating temperature of the fuel cell can be used. Wait. [0028] When encapsulating, the gasket 28 can be placed in the recess 241, and because the height is greater than the depth of the recess 241, the top slightly protrudes from the surface of the lower baffle 24. The membrane electrode assembly 22 is placed between the lower baffle 24 and the upper baffle 26. When the upper baffle 26 is clamped with the lower baffle 24, the gasket 28 is squeezed and elastically deformed, and the washer 28 is The sides abut against the groove 241 and the membrane electrode group 22, respectively, and further the membrane electrode group 22 is clamped against the upper deflector 26, thereby preventing the fuel gas or the oxime gas from being blocked by the upper baffle 26 or The flow guiding groove 243 on the inner side of the lower deflector 24 leaks out. Compared with the sealing method of the prior art, the sealing structure of the embodiment can save components, only one sealing gasket is needed, and the structure is simple; the gasket and the groove cooperate with each other, easy to align and install, and the sealing effect is good. [0029] It should be noted that the above description only describes the sealing structure formed between the membrane electrode assembly of the fuel cell and the baffle plate. In practice, the fuel cell may further include its 094120206 Form No. A0101 Page 9 / Total 22 Page 0993323504-0 1338405 On September 09, 099, the replacement of the page components, including the current collector plates described in the prior art, and the fuel/oxidant delivery system, etc., are not described herein. Referring to the fourth figure, the sealing structure of the second embodiment of the present invention is basically the same as that of the first embodiment, and mainly includes: a membrane electrode assembly 22, an upper baffle 26 and a lower baffle 24. Group 22 is sandwiched in the middle. The inner surface of the upper baffle 26 and the lower baffle 24 facing the membrane electrode assembly 22 respectively have one or a plurality of flow guiding grooves 263 and 243 for uniform distribution of the fuel gas or the oxidant gas, and may also be used for generating the reaction. The water is exported. The area in which the flow channels 243, 263 are distributed may be referred to as a flow guiding bed. A groove 241 surrounds the guide bed formed on the surface of the lower baffle 24. As shown, the groove 241 is square in shape, and may of course be circular, trapezoidal or the like. The upper baffle 26 and the lower baffle 24 may be made of graphite, gold or conductive composite material. [0031] The sealing structure further includes a washer 28 having a shape that cooperates with the recess 241 and has a cross-sectional width that is slightly smaller or the same as the width of the recess 241. In this embodiment, the washer 28 has a square carrier surface having a height slightly greater than the depth of the recess 241. It is of course also possible to use gaskets of other cross-sectional shapes, such as circular, trapezoidal, etc. The gasket 28 is made of an insulating material, preferably made of a heat-resistant and elastic material, to adapt to the operating temperature of the fuel cell and to provide elasticity. For example, polyurethane, rubber, any insulating material capable of adapting to the operating temperature of the fuel cell can be used. Wait. [0032] When encapsulating, the edge portion 221 of the membrane electrode assembly 22 is bent into the recess 241, but the end thereof is not in contact with the lower baffle 24 to prevent short circuit; the gasket 28 is also placed in the recess 241. The inside is located outside the edge portion 221 of the membrane electrode group 22, and the top portion thereof is slightly protruded from the surface of the lower deflector 24. Membrane electrode group 094120206 Form No. A0101 Page 10/Total 22 page 0993323504-0 1338405 After September 09, 2009, the intermediate body portion of the replacement page 22 is placed between the lower baffle 24 and the upper baffle 26 When the deflector 26 is clamped to the lower deflector 24, the upper deflector 26 presses the washer 28 into the recess 241 to elastically deform the washer 28 so as to extend into the edge portion of the membrane electrode assembly 22 in the recess 241. The 221 abuts against the side wall of the recess 241 to form a clamping. In addition, the top of the washer 28 forms abutment with the upper baffle 26 to thereby form a seal, thereby preventing fuel gas or oxidant gas from being guided by the upper baffle 26 or the lower deflector. The flow guiding groove 243 on the inner side of the plate 24 leaks out.
[0033]請參閱第五圖’本發明第三實施例之燃料電池密封結構 主妻包括：膜電極組32，上導流板36及下導流板34將該 膜電極組32夾於中間。上導流板36與下導流板34面對膜 電極組3 2之内側表面分別具有二條或複數條導流槽3 4 3，Referring to Fig. 5, a fuel cell sealing structure according to a third embodiment of the present invention includes a membrane electrode assembly 32, and an upper deflector 36 and a lower deflector 34 sandwich the membrane electrode assembly 32 therebetween. The inner surface of the upper baffle 36 and the lower baffle 34 facing the membrane electrode group 32 have two or a plurality of diversion grooves 3 4 3, respectively.
以利於燃料氣體或氧化劑氣體均勻分佈，另外亦可用於 將反應產生的水導出。導流槽343分佈之區域可稱為導流 床。一凹槽341圍繞該導流床形成在下導流板34表面，如 第五圖所示，凹槽341之截面為方形，當然，亦可為圓形 、梯形等其他形狀。上導流板36對應該凹槽341位置形成 有環繞導流床之凸起362，其對應該下導流板之凹槽341 ，並可具有相配合之形狀及尺寸。該上導流板36及下導 流板34可由石墨、金屬或導電性複合材料製成。 圆㈣結構還包括-_38，其具有與該凹槽341相配合之 形狀及尺寸。本實施例中，塾圈38具有方形裁面，其高 度較凹槽341之深度大或相同。當然亦可採用其他截面形 狀之塾圈 > 圓形、梯形等。該㈣38採用絕緣材料， 最好㈣熱、彈性材料製成，以適應燃料電池之工作溫 度並π提供彈性’例如可採用聚胺脂、_任何具有彈 094120206 表箪編號Α0101 第丨丨頁/共22頁 0993323504-0 IB8405 099年09月09日 性且能適應燃料 電池工作溫度之絕緣材料等。 [0035] 封裝時，該墊圈38可置於該凹槽341内，其頂部與下導流 板34表面平齊或稍有突出。膜電極組32則放置於下導流 板34與上導流板36之間，當上導流板36與下導流板34夹 緊時，上導流板36之凸起362擠壓膜電極組32，並將墊圈 38抵靠至四槽341内使墊圈38發生彈性變形，藉此凹槽 341與墊圈38構成密封，從而可防止燃料氣體或氧化劑氣 體由上導流板36或下導流板34内側之導流槽343泄漏出來 〇 [0036] 本實施例除具有可節省元件，結構簡單，墊圈與凹槽容 易配合，容易對準、安裝等特點之外，其進一步採用凸 起362可與墊圈38配合形成Jl導故板之奢封，有利於進一 步提高本實施例之密射性能。 [0037] 請參閱第六圖，本發明第三實施例之密封結構主要包括 :膜電極組22，上導流板26及下導流板24，二者可將該 膜電極組22夾於中間。上導流板26與下導流板24面對膜 電極組2 2之内侧表面分別具有一條或複數條導流槽2 4 3。 導流槽243分佈之區域可稱為導流床。一凹槽241圍繞該 導流床形成在下導流板24表面’如圓所示，凹槽241之戴 面為方形，當然，亦可為圓形、梯形等其他形狀。另外 ，相應的，上導流板26對應於凹槽241之位置亦具有凹槽 261。該上導流板26及下導流板24可由石墨、金屬或導電 性複合材料製成。 [0038] 密封結構還包括二環形之墊圈28及25，其分別具有與該 094120206 表單編號A0101 第12頁/共22頁 0993323504-0 1338405 099年09月09日修正替换頁 凹槽241，261相配合之形狀，且其截面寬度較凹槽241 ，261寬度稍小或相同。本實施例中，垫圈28，25具有方 形截面，其高度較凹槽241，261之深度稍大。當然亦可 採用其他截面形狀之墊圈，如圓形、梯形等。該墊圈28 ，2 5採用絕緣材料，最好由财熱、彈性材料製成，以適 應燃料電池之工作溫度並能提供彈性，例如可採用聚胺 脂、橡膠任何具有彈性且能適應燃料電池工作溫度之絕 緣材料等。 [0039] 封裝時，墊圈25，28分別置於凹槽261，241内，並稍微 突出。膜電極組22放置於下導流板24與上導流板26之間 ，當上導流板26與下導流板24夹緊時，墊圈25與28互相 抵靠、擠壓發生彈性變形並夾持住膜電極組22，藉此構 成密封，從而可防止燃料氣體或氧化劑氣體由上導流板 26或下導流板24内側之導流槽243泄漏出來。 [0040] 以上僅描述燃料電池組之主要部件，其他外圍輔助組件（ 例如緊固裝置、燃料傳輸設計等）可參考先前技術，在此 不作詳細描述。 [0041] 綜上所述，本發明符合發明專利要件，爰依法提出專利 申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟悉本發明 技藝之人士，在援依本發明精神所作之等效修飾或變化 ，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 [0042] 第一圖係先前技術之燃料電池密封結構之分解示意圖。 094120206 表單編號A0101 第13頁/共22頁 0993323504-0 1338405 099年09月09日接正替换頁 [0043] [0044] [0045] [0046] [0047] [0048] [0049] [0050] [0051] [0052] [0053] [0054] [0055] [0056] 第二圖係本發明第一實施例提供之密封結構分解示意圖 〇 第三圖係本發明第一實施例密封結構之剖示圖。 第四圖係本發明第二實施例密封結構之剖示圖。 第五圖係本發明第三實施例密封結構之剖示圖。 第六圖係本發明第四實施例密封結構之剖示圖。 【主要元件符號說明】 密封結構：20 · 膜電極組：22，32 下導流板：24，34 . 'V：v. ；* 墊圈·· 25，28，38 上導流板：26，36 邊緣部分：221 凹槽：241，261，341 · 導流槽：243，263，343 凸起：362 094120206 表單編號A0101 第丨4頁/共22頁 0993323504-0In order to facilitate the uniform distribution of the fuel gas or the oxidant gas, it is also used to derive the water produced by the reaction. The area in which the guide grooves 343 are distributed may be referred to as a flow guide bed. A groove 341 is formed around the guide bed on the surface of the lower baffle 34. As shown in the fifth figure, the groove 341 has a square cross section, and may of course be circular, trapezoidal or the like. The upper baffle 36 is formed with a projection 362 surrounding the guide bed corresponding to the groove 341, which corresponds to the groove 341 of the lower baffle and can have a matching shape and size. The upper baffle 36 and the lower baffle 34 may be made of graphite, metal or a conductive composite material. The circular (four) structure also includes -_38 having a shape and size that cooperates with the recess 341. In the present embodiment, the loop 38 has a square cut surface whose height is larger or the same as the depth of the groove 341. Of course, other cross-sections of the shape > circle, trapezoid, etc. can also be used. The (4) 38 is made of an insulating material, preferably (4) heat and elastic material to adapt to the operating temperature of the fuel cell and π provides elasticity 'for example, polyurethane can be used, _ any with a spring 094120206 No. Α 0101 page / total 22 pages 0993323504-0 IB8405 Insulating materials that can be adapted to the operating temperature of fuel cells, etc., September 09, 099. [0035] When packaged, the gasket 38 can be placed in the recess 341 with the top portion flush with or slightly protruding from the surface of the lower deflector 34. The membrane electrode assembly 32 is placed between the lower baffle 34 and the upper baffle 36. When the upper baffle 36 and the lower baffle 34 are clamped, the protrusion 362 of the upper baffle 36 presses the membrane electrode. The set 32 and the washer 38 abutting into the four slots 341 elastically deform the washer 38, whereby the recess 341 forms a seal with the washer 38, thereby preventing the fuel gas or oxidant gas from being deflected by the upper baffle 36 or the lower deflector 36. The guide groove 343 on the inner side of the plate 34 leaks out. [0036] In addition to the features of saving components, simple structure, easy fitting of the gasket and the groove, easy alignment and installation, the protrusion 362 can be further adopted. The combination with the gasket 38 forms a luxury seal of the J1 guide plate, which is advantageous for further improving the heat transfer performance of the embodiment. Referring to FIG. 6 , the sealing structure of the third embodiment of the present invention mainly includes: a membrane electrode assembly 22 , an upper baffle 26 and a lower baffle 24 , which can sandwich the membrane electrode assembly 22 . The inner surface of the upper deflector 26 and the lower baffle 24 facing the membrane electrode group 2 2 respectively have one or a plurality of flow guiding grooves 243. The area in which the guide grooves 243 are distributed may be referred to as a flow guiding bed. A groove 241 is formed around the surface of the lower baffle 24 around the guide bed. As shown by the circle, the surface of the groove 241 is square. Of course, it may have other shapes such as a circle or a trapezoid. In addition, correspondingly, the upper baffle 26 also has a recess 261 corresponding to the position of the recess 241. The upper baffle 26 and the lower baffle 24 may be made of graphite, metal or a conductive composite material. [0038] The sealing structure further includes two annular washers 28 and 25, respectively having the same as the 094120206 Form No. A0101, Page 12/22, 0993323504-0 1338405, September 09, 999, and the replacement page groove 241, 261 The shape of the fit is such that the width of the section is slightly smaller or the same as the width of the grooves 241, 261. In this embodiment, the washers 28, 25 have a square cross-section having a height slightly greater than the depth of the recesses 241, 261. It is of course also possible to use gaskets of other cross-sectional shapes, such as circular, trapezoidal and the like. The gaskets 28, 25 are made of an insulating material, preferably made of a heat and elastic material, to adapt to the operating temperature of the fuel cell and provide elasticity. For example, polyurethane or rubber can be used to flexibly adapt to fuel cell operation. Temperature insulation materials, etc. [0039] When encapsulating, the washers 25, 28 are placed in the grooves 261, 241, respectively, and protrude slightly. The membrane electrode assembly 22 is placed between the lower baffle 24 and the upper baffle 26. When the upper baffle 26 and the lower baffle 24 are clamped, the washers 25 and 28 abut each other and are elastically deformed and pressed. The membrane electrode assembly 22 is held, thereby forming a seal, thereby preventing the fuel gas or the oxidant gas from leaking out from the upper deflector 26 or the guide groove 243 on the inner side of the lower deflector 24. [0040] Only the main components of the fuel cell stack are described above. Other peripheral auxiliary components (such as fastening devices, fuel transmission designs, etc.) may refer to the prior art and will not be described in detail herein. [0041] In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or changes in the spirit of the present invention will be apparent to those skilled in the art. , should be included in the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0042] The first figure is an exploded schematic view of a prior art fuel cell sealing structure. 094120206 Form No. A0101 Page 13 / Total 22 Page 0993323504-0 1338405 September 09, 2009, the replacement page [0043] [0045] [0046] [0049] [0049] [0050] 2 is a schematic exploded view of a sealing structure provided by a first embodiment of the present invention. FIG. 3 is a cross-sectional view showing a sealing structure of a first embodiment of the present invention. [0055] FIG. . Figure 4 is a cross-sectional view showing a sealing structure of a second embodiment of the present invention. Figure 5 is a cross-sectional view showing a sealing structure of a third embodiment of the present invention. Figure 6 is a cross-sectional view showing a sealing structure of a fourth embodiment of the present invention. [Main component symbol description] Sealing structure: 20 · Membrane electrode group: 22, 32 Lower deflector: 24, 34 . 'V:v. ;* Washer · · 25,28,38 Upper deflector: 26,36 Edge portion: 221 Groove: 241, 261, 341 · Guide groove: 243, 263, 343 Raised: 362 094120206 Form No. A0101 Page 4 of 22 0993323504-0