1299593 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種具有密封裝置之燃料電池雙極板，尤指一 種藉由所設密封裝置以確保燃料電池之陰極及陽極相互隔離之 雙極板。 【先前技術】 如第六圖及第七圖所示，質子交換膜燃料電池（PEMFC)5又 稱高分子薄膜燃料電池，其係由一薄膜電極組（MembraneBACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell bipolar plate having a sealing device, and more particularly to a bipolar electrode which is provided with a sealing device to ensure that the cathode and the anode of the fuel cell are isolated from each other. board. [Prior Art] As shown in Fig. 6 and Fig. 7, a proton exchange membrane fuel cell (PEMFC) 5 is also called a polymer membrane fuel cell, which is composed of a membrane electrode group (Membrane).
Electrode Assembly，MEA) 50 夾於兩塊雙極板（Bi-P〇lar Plate) 56間所組成，以薄膜電極組50分隔之兩邊分屬陰極51與陽極 52 ’如述陽極52為氧化反應，陰極51為還原反應。當陽極52 之氫氣Η接觸到與質子交換膜5〇a相鄰之觸媒（一般為白金或白 金合金)50b時，氫氣分子會解離成為氫離子及電子，其中電子會 ，由銜接陽極52與陰極51之電橋，經與電橋串接之負載53自 陽極52游往陰極5丨，氫離子則直接自陽極穿越質子交換膜 ，到達陰極51，特別強調較此質子交換膜50a為含濕性之薄 膜具有僅容許氫離子伴隨水分子穿越而其他氣體分子均無法穿 越之特，在觸媒5〇b的作用下，經由電橋到達陰極$ 1之電子 與氧〇結合成氧離子，並隨即與穿越質子交換膜50a之氫離子合 成形成水为子，此即為通稱之電化學氧化與還原反應過程。 表泰應用如此之電化學反應過程，使得質子交換膜燃料電池5之 =黾系、、’先具有效率鬲、無污染、反應快、可經由串聯提高電样泰 堡或=電極反應面積提高電流量等，特別是燃料電池在减= 斷=氫氣及氧氣（通常使用空氣）的供給下，它可以源源不斷 出電力供給負載的需求。在這樣的特點下，f子交換膜燃料 5可以是小型系統電力的來源，也可以設計成為大型電廠、' 式電力及可移動電力。 刀畋 1299593 請續參考第七圖，於質子交換膜燃料電池5結構中，薄膜電 極組50係由一層高分子薄膜（如DuPont公司所產之Nafion ) 50a 於表層塗上一層觸媒50b及黏貼一層擴散層（例如碳布或碳紙）50c 所組成；雙極板56則由導電材料（例如石墨）内嵌有燃氣流道 及散熱流道57。前述薄膜電極組50兩邊之燃氣流道分別為前述 陰極51與陽極52，流道將陰極51之氧氣與陽極52之氫氣均勻 且迅速地引至薄膜電極組50表層，與觸媒50b產生電化學反應 而形成具有電動勢之電力、熱量之熱力及生成物-水。具有電動勢 之電子由外加電橋電子迴路電橋通路形成可利用之電流，其他產 物（如水和熱）則經由相關機制（如氣冷或水冷）排出電池外。單 一電池所產生之直流電壓應用範圍一般約在0.6〜CK8 V間，電池 可經由堆疊串聯成為多電池之電池組，隨著電池堆疊數量的增 加，電池組之直流電壓串聯累積的效果，可提高電池組的電壓輸 出值，獲得提高功率的效果。除了增加電池堆疊串聯數外，亦可 由增加電池之有效電化學反應面積，提高每一單電池電流量，亦 獲得提高功率的效果。 在燃料電池的結構上，除了上述的核心元件之外，氣體的密 封也是十分重要的。燃料電池使用的燃料通常為可燃性，而薄膜 電極組50另一側為空氣，兩者混合之後在觸媒催化下很容易發 生燃燒反應，因此必須注意兩種氣體不可相互洩漏。有關燃料電 池組内部流體流動示意圖如第八圖所示，其中，設於雙極板56 上之氣體岐道64及其連通之氣體流道59位置上之兩氣體…氧化 劑62(例如空氣）及燃料63(例如氫氣）最接近的位置，很容易發生 氣體洩漏的現象。為防止前述氣體洩漏現象，必須於薄膜電極組 50外層加上密封墊片（密封裝置）60，利用該密封墊片彈性材質的 變形來阻絕氣體的洩漏。因此，密封墊片60在整個燃料電池的 設計係屬不可或缺的重要元件。 1299593 質子交換膜燃料電池串聯成為多電池之電池組，雖然電池組 内之陰極與陽極彼此交錯堆疊，同一屬性之電極之燃料供給仍透 過共同之歧道，為了石雀保燃料不得流入另一不同屬性之電極，因 此需要有一密封裝置環繞於電極週邊隔離供給氣體之歧道，避免 不同屬性之供氣歧道氣體流入，而於同屬性之供氣歧道藉由電極 與歧道間之於雙極板設置連通氣體流道，使氣體順利流入電極。 例如，陰極之氧氣供氣歧道藉由各個陰極與歧道間之雙極板設置 氣體流道，氧氣透過此氣體流道流入各個陰極，而氧氣供氣歧道 於陽極時，則設有一密封裝置，此密封裝置置於陽極及其相鄰之 雙極板，避免陰極之氧氣供氣歧道之氣體流入陽極，或陽極内之 氫氣流入陰極之氧氣供氣歧道。同理，陽極之氫氣供氣歧道藉由 ^個陽極與歧道間之雙極板設置氣體流道，氫氣透過此氣體流道 机入各個陽極，而氫氣供氣歧道於陰極時，則設有一密封裝置， 此在封襞置設置於陰極及其相鄰之雙極板，避免陽極之氳氣供氣 歧道之氣體流入陽極，或陰極内之氫氣流入陰極之氫氣供氣歧 道。 :其次，设置雄、封裝置之目的是隔絕歧道之氣體流入不同屬性 ，電極，同時密封裝置也是維繫氣體於電極内避免外洩至電極外 邛。亦即，透過挽封裝置使電池内之流體依照既有設計流路流 動，避免陰極與陽極之氣體交互跨越溢流（〇verfl〇w)。 、一般而言，密封裝置係位於一對雙極板間，因此密封裝置通 ¥需配合雙極板間之電極組及電池之擴散層（GDL)厚度，一般擴 政層於電池内組合後之厚度約為〇1~〇 3mm，因此選用之密封穿 置亦需配合約0.1〜0.3mm之間；再者，密封裝置材料要求亦需抗 腐蝕，同時具備可壓縮彈性，例如常用之矽橡膠即是一例。 參考第九圖’各密封裝置6〇之壓合係透過兩側雙極板％之 力量’使各密封裝置60緊密與該側之雙極板56接觸貼合，於連 1299593 通氣體歧道64之流道59之肋58處，壓合並無問題。然而，於 該連通氣體歧道64之氣體流道59處之部分密封裝置60則因懸 空於流道59上方，加上相當薄無法有效内部橫向傳輸承受肋58 之壓力，因此部分的密封裝置60未能緊密與連通氣體流道59對 邊之雙極板56壓合，導致密封裝置60及電極組50因未能壓合 而出現縫隙61，此缝隙61致使氣體流入連通氣體歧道64之流道 59對邊之電極或由對邊之電極流出，造成氣體交互跨越溢流 (overflow)，如第十圖所示。 亦即，位於前述氣體歧道64與連通氣體歧道64之流道59 處之密封裝置60無法有效密貼於流道59對邊電極之雙極板56， 而導致氣體交互跨越溢流，例如，陽極氫氣於氫氣供給歧道與陽 極連通流道處，其對邊之陰極需由密封裝置與雙極板緊密壓合， 此壓合之力量為電極組緊鄰之兩側雙極板，當兩側雙極板為完整 平面時，來自於兩側雙極板力量可以有效使密封裝置60緊密壓 合，當其中一側之雙極板56為氣體入口或出口之連通流道時， 於連通流道處之兩側雙極板56未能緊密壓合密封裝置60，該密 封裝置60於連通氣體歧道64之流道59處日久即產生鬆弛塌陷 現象，導致氣體交互跨越溢流而縮短電池壽命。 【發明内容】 本發明之目的在提供一種具有密封裝置之燃料電池雙極 板，可避免密封裝置及電極組因密封裝置老化未能壓合而出現縫 隙，致使氣體流入連通氣體岐道之流道對邊之電極或由對邊之電 極流出，造成氣體交互跨越溢流（overflow)所導致電池壽命縮減， 可確保燃料電池之陰極及陽極相互隔離，以延長燃料電池壽命。 達到上述目的之具有密封裝置之燃料電池雙極板，包含：至 少一對氣體岐道、連通該對氣體岐道之複數氣體流道、橫切於連 通氣體岐道之流道處之凹槽及密封裝置，該密封裝置係環設於前 1299593 述複數氣體流道之周圍且設有對應嵌入於前述凹槽中之突出體。 本發明之前述目的或特徵，將依據後附圖式加以詳細說明， 惟需明瞭的是，後附圖式及所舉之例，祇是做為說明而非在限制 或縮限本發明。 【實施方式】 如第一圖至第四圖所示，其中：第一圖係本發明之部分剖面 立體示意圖，顯示連通氣體岐道之流道處之兩側雙極板設有橫切 於流道之凹槽；第二圖係第一圖線2-2之部分剖面圖，顯示連通 氣體岐道之流道處之密封裝置及雙極板凹槽之結構；第三圖係第 二圖線3-3之部分剖面圖，顯示因密封裝置厚度增加，使來自於 肋之雙極板壓合力量可擴散至連通氣體岐道之流道上方之密封 裝置；第四圖係顯示連通氣體岐道之流道處之雙極板設有橫切於 流道之凹槽之正視圖。 本發明之具有密封裝置20之雙極板10，包含：至少一對氣 體岐道15、連通該對氣體岐道之複數氣體流道12、橫切於連通 氣體岐道之流道12處之凹槽13及密封裝置20，該密封裝置20 係環設於前述複數氣體流道12之周圍且一體成型地設有對應嵌 入於前述凹槽13中之突出體21。一電極組14係由一對前述具有 密封裝置20之雙極板10所挾持。且於本實施例中，該密封裝置 為一塾片。 由於密封裝置20之突出體21係設置於凹槽13中，藉由密 封裝置20具有厚實之突出體21之設計，使來自於由肋11處之 壓合力量F不僅壓合其上方之密封裝置20與電極組14，更可將 該壓合力量F橫向擴散傳輸至流道12上端之另一密封裝置20， 使得密封裝置20與電極組14完全與雙極板10壓合，因連通氣 體岐道15之流道12處亦能承受壓合力量，從而橫切於連通氣體 岐道15之流道12上方之密封裝置20不易彎曲變形，習知結構 1299593 之縫隙61(參第十圖）即不會出現。 前述凹槽13處之原密封裝置可因此加厚，增強密封裝置結 構，此橫切凹槽之下方， 為配合密封裝置20設有突出體21而需設有橫切於連通氣體 岐道15之流道12之凹槽13，雙極板10需增加厚度以維持其強 度，避免斷裂，並且藉以保有流道12空間而讓供給氣體A可順 利進/出。 如前述第一圖至第四圖所示之第一具體實施例之凹槽13為 複數個且分別獨立橫切於連通氣體岐道15之流道12之外，該凹 槽13亦可如第五圖所示呈串接且擴及雙極板10電極四周圍而呈 現一封閉環狀，更能增加燃料電池燃氣之長期封閉效果，有效增 加燃料電池之可靠度及使用壽命。 本發明之優點在於：可有效改善密封裝置老化未能壓合而出 現之缝隙，避免氣體流入連通氣體歧道之流道對邊之電極或由對 邊之電極流出所造成氣體交互跨越溢流（overflow)之現象，確保燃 料電池之陰極及陽極相互隔離，以延長燃料電池壽命。 1299593 【圖式簡單說明】 第一圖係顯示本發明第一具體實施例之部分剖面立體圖。 第二圖係顯示由第一圖線2-2之部分剖面圖。 第三圖係顯示第二圖線3-3之部分剖面圖。 第四圖係顯示本發明第一具體實施例之正視圖。 第五圖係顯示本發明第二具體實施例之正視圖。 第六圖係顯示質子交換膜燃料電池之陽極氧化反應與陰極 還原反應之示意圖。 第七圖係顯示質子交換膜燃料電池之基本組成結構示意圖。 第八圖係顯示質子交換膜燃料電池内部流體流動之示意圖。 第九圖係顯示質子交換膜燃料電池之以傳統览封裝置壓合 之示意圖。 第十圖係顯示第九圖傳統密封裝置壓合造成缝隙導致氣體 交互跨越溢流之示意圖。 [主要元件符號對照說明] 10…雙極板 11…肋 12…氣體流道 13…凹槽 14…電極組 20…密封裝置 21…突出體 F…壓合力量Electrode Assembly (MEA) 50 is sandwiched between two bi-polar plates (Bi-P〇lar Plate) 56, and the two sides separated by the thin film electrode group 50 are divided into a cathode 51 and an anode 52', such as the anode 52, for oxidation reaction. The cathode 51 is a reduction reaction. When the hydrogen gas of the anode 52 contacts the catalyst (generally platinum or platinum alloy) 50b adjacent to the proton exchange membrane 5〇a, the hydrogen molecules will dissociate into hydrogen ions and electrons, wherein the electrons will be connected by the anode 52 and The bridge of the cathode 51 travels from the anode 52 to the cathode 5 through a load 53 connected in series with the bridge, and the hydrogen ions pass directly from the anode through the proton exchange membrane to the cathode 51, with particular emphasis on the wetness of the proton exchange membrane 50a. The film of the nature has the characteristic that only the hydrogen ions can be traversed by the water molecules and the other gas molecules cannot pass through. Under the action of the catalyst 5〇b, the electrons reaching the cathode through the bridge and the oxygen oxime are combined into oxygen ions, and It is then synthesized with hydrogen ions passing through the proton exchange membrane 50a to form water, which is a so-called electrochemical oxidation and reduction reaction process. The application of such an electrochemical reaction process to the surface of the proton exchange membrane fuel cell 5 = lanthanide, 'first efficient 鬲, no pollution, fast response, can increase the current through the series of electric sample Taibao or = electrode reaction area The amount, etc., especially in the fuel cell supply of minus = off = hydrogen and oxygen (usually using air), it can continuously supply electricity to the load demand. Under such characteristics, the F-exchange membrane fuel 5 can be a source of power for small systems, and can also be designed as a large power plant, 'electricity and mobile power. Knife 畋1299593 Please continue to refer to the seventh figure. In the structure of proton exchange membrane fuel cell 5, the membrane electrode assembly 50 is coated with a layer of catalyst 50b and pasted on a surface layer of a polymer film (such as Nafion produced by DuPont) 50a. A diffusion layer (for example, carbon cloth or carbon paper) 50c is formed; and the bipolar plate 56 is embedded with a gas flow path and a heat dissipation passage 57 by a conductive material (for example, graphite). The gas flow passages on both sides of the membrane electrode assembly 50 are the cathode 51 and the anode 52, respectively. The flow channel uniformly and rapidly introduces the oxygen of the cathode 51 and the hydrogen of the anode 52 to the surface layer of the membrane electrode assembly 50, and electrochemically reacts with the catalyst 50b. The electric power with electric potential, the heat of heat, and the product-water are formed. Electrons with electromotive force form an available current by an external bridge electronic loop bridge path, and other products (such as water and heat) are discharged outside the battery via a related mechanism such as air or water cooling. The application range of DC voltage generated by a single battery is generally between 0.6 and CK8 V. The battery can be connected into a battery pack of multiple batteries via stacking. As the number of stacked batteries increases, the DC voltage of the battery pack can be increased in series. The voltage output value of the battery pack is used to obtain an effect of increasing power. In addition to increasing the number of battery stacks in series, it is also possible to increase the effective electrochemical reaction area of the battery, increase the amount of current per cell, and also obtain an effect of increasing power. In addition to the core components described above, the sealing of the gas is also important in the construction of the fuel cell. The fuel used in the fuel cell is usually flammable, and the other side of the membrane electrode assembly 50 is air. When the two are mixed, the combustion reaction easily occurs under catalytic catalysis, so it must be noted that the two gases cannot leak each other. A schematic diagram of the fluid flow inside the fuel cell stack is shown in the eighth diagram, wherein the gas channel 64 disposed on the bipolar plate 56 and the gas channel 59 at the position of the gas channel 59 connected thereto are oxidant 62 (for example, air) and The closest position of the fuel 63 (for example, hydrogen) is prone to gas leakage. In order to prevent the above gas leakage phenomenon, a gasket (sealing device) 60 must be applied to the outer layer of the membrane electrode assembly 50, and the deformation of the elastic material of the gasket is used to prevent gas leakage. Therefore, the gasket 60 is an indispensable and important component throughout the design of the fuel cell. 1299593 Proton exchange membrane fuel cells are connected in series to become a multi-battery battery pack. Although the cathode and anode in the battery pack are alternately stacked with each other, the fuel supply of the electrode of the same property still passes through the common manifold, so that the fuel can not flow into another different for the stone bird. The electrode of the attribute, therefore, a sealing device is required to surround the periphery of the electrode to isolate the gas supply channel, so as to avoid the inflow of the gas supply manifold gas of different properties, and the gas supply manifold of the same property is connected between the electrode and the manifold The plates are connected to the gas flow path to allow the gas to flow smoothly into the electrodes. For example, the oxygen supply manifold of the cathode is provided with a gas flow path through the bipolar plates between the cathodes and the manifolds, oxygen flows through the gas flow paths into the respective cathodes, and when the oxygen supply channels are at the anode, a seal is provided. The device is placed on the anode and its adjacent bipolar plates to prevent gas from the cathode oxygen supply manifold from flowing into the anode, or hydrogen in the anode flowing into the oxygen supply manifold of the cathode. Similarly, the hydrogen gas supply manifold of the anode is provided with a gas flow channel through a bipolar plate between the anode and the manifold, and hydrogen gas is introduced into each anode through the gas flow channel, and when the hydrogen gas supply channel is at the cathode, A sealing device is disposed, which is disposed on the cathode and its adjacent bipolar plates in the sealing device, so that the gas of the helium gas supply manifold of the anode flows into the anode, or the hydrogen gas in the cathode flows into the hydrogen gas supply manifold of the cathode. :Secondly, the purpose of setting the male and sealing devices is to isolate the gas flowing into the manifold into different properties, and the sealing device is also to maintain the gas in the electrode to avoid leakage to the outside of the electrode. That is to say, the fluid in the battery flows through the existing design flow path through the sealing device, so that the gas between the cathode and the anode crosses the overflow (〇verfl〇w). Generally speaking, the sealing device is located between a pair of bipolar plates, so the sealing device needs to cooperate with the electrode group between the bipolar plates and the diffusion layer (GDL) thickness of the battery, and the general expansion layer is combined in the battery. The thickness is about 〇1~〇3mm, so the sealing wear should be matched with about 0.1~0.3mm. In addition, the sealing device material requirements also need to resist corrosion, and at the same time have compressive elasticity, such as the commonly used rubber. This is an example. Referring to the ninth figure, the pressing force of each sealing device 6〇 transmits the sealing device 60 tightly to the bipolar plate 56 of the side through the force of the two sides of the bipolar plate, and the gas channel 64 is connected to the 1929959 gas passage 64. At the rib 58 of the flow passage 59, there is no problem in pressing. However, a portion of the sealing means 60 at the gas flow path 59 of the communication gas manifold 64 is suspended above the flow path 59, and a relatively thin internal pressure transmitting rib 58 is not effective, so that the partial sealing means 60 Failure to closely press the bipolar plates 56 on the opposite sides of the communication gas flow path 59 causes the sealing device 60 and the electrode assembly 50 to have a gap 61 due to failure to press, and the gap 61 causes the gas to flow into the flow of the communication gas channel 64. The electrodes on the opposite side of the track 59 or from the opposite side of the electrode cause the gas to interact across the overflow, as shown in the tenth figure. That is, the sealing device 60 located at the flow path 59 of the gas channel 64 and the communication gas channel 64 cannot effectively adhere to the bipolar plate 56 of the opposite electrode of the flow channel 59, thereby causing gas interaction across the overflow, for example The anode hydrogen is supplied to the flow channel between the manifold and the anode of the hydrogen gas, and the cathode of the opposite side is tightly pressed by the sealing device and the bipolar plate, and the force of the pressing is the bipolar plate adjacent to the electrode group, when two When the side bipolar plates are completely flat, the strength of the bipolar plates from both sides can effectively press the sealing device 60 tightly. When one of the bipolar plates 56 is a gas inlet or outlet connecting passage, the connecting flow is The bipolar plates 56 on both sides of the track fail to tightly press the sealing device 60. The sealing device 60 is slack and collapsed at the flow path 59 connecting the gas channels 64, causing the gas to cross over the overflow and shorten the battery. life. SUMMARY OF THE INVENTION The object of the present invention is to provide a fuel cell bipolar plate having a sealing device, which can prevent a gap between a sealing device and an electrode group from being pressed due to aging of the sealing device, and causing gas to flow into a flow path connecting the gas channel. The electrode on the opposite side or the electrode on the opposite side causes the gas to cross over the overflow, resulting in a reduction in battery life, ensuring that the cathode and anode of the fuel cell are isolated from one another to extend fuel cell life. A fuel cell bipolar plate having a sealing device for achieving the above object, comprising: at least one pair of gas channels, a plurality of gas channels connecting the pair of gas channels, and a groove transverse to the channel connecting the gas channels and a sealing device, the sealing device is disposed around the plurality of gas flow passages of the first 1929593 and is provided with a protrusion correspondingly embedded in the groove. The above-mentioned objects and features of the present invention will be described in detail with reference to the accompanying drawings. [Embodiment] As shown in the first to fourth figures, wherein: the first figure is a partial cross-sectional perspective view of the present invention, showing that the bipolar plates on both sides of the flow path connecting the gas channels are provided with a cross-cut flow. The second figure is a partial cross-sectional view of the first line 2-2, showing the structure of the sealing device and the bipolar plate groove at the flow path connecting the gas channel; the third picture is the second line A partial cross-sectional view of 3-3 shows that due to the increase in the thickness of the sealing device, the pressing force from the rib bipolar plate can be diffused to the sealing device above the flow channel connecting the gas channel; the fourth figure shows the connecting gas channel The bipolar plate at the flow path is provided with a front view of the groove transverse to the flow path. The bipolar plate 10 having the sealing device 20 of the present invention comprises: at least one pair of gas passages 15, a plurality of gas passages 12 communicating the pair of gas passages, and a concave passage at a flow passage 12 transverse to the communication gas passages The groove 13 and the sealing device 20 are disposed around the plurality of gas flow paths 12 and integrally formed with protrusions 21 correspondingly embedded in the grooves 13. An electrode group 14 is held by a pair of the above-described bipolar plates 10 having the sealing means 20. In this embodiment, the sealing device is a cymbal. Since the projection 21 of the sealing device 20 is disposed in the recess 13, the sealing device 20 has a design of the thick projection 21, so that the pressing force from the pressing force F at the rib 11 is not only pressed against the sealing device 20 and the electrode group 14, the pressing force F can be laterally diffused and transmitted to the other sealing device 20 at the upper end of the flow channel 12, so that the sealing device 20 and the electrode group 14 are completely pressed against the bipolar plate 10, because the gas is connected. The flow passage 12 of the passage 15 can also withstand the pressing force, so that the sealing device 20 which is transverse to the flow passage 12 connecting the gas passages 15 is not easily bent and deformed, and the slit 61 of the conventional structure 1299959 (refer to FIG. 10) Will not appear. The original sealing device at the groove 13 can be thickened accordingly to enhance the structure of the sealing device. Below the transverse groove, a protrusion 21 is provided for the sealing device 20, and a cross-section of the connecting gas channel 15 is required. The groove 13 of the flow path 12, the bipolar plate 10 needs to be increased in thickness to maintain its strength, avoiding breakage, and thereby maintaining the space of the flow path 12 to allow the supply gas A to smoothly enter/exit. The groove 13 of the first embodiment shown in the foregoing first to fourth figures is a plurality of grooves and is independently transverse to the flow path 12 of the communicating gas channel 15, and the groove 13 can also be The five figures are shown in series and extend to the periphery of the electrode of the bipolar plate 10 to present a closed ring shape, which can increase the long-term sealing effect of the fuel cell gas, and effectively increase the reliability and service life of the fuel cell. The invention has the advantages that the gap formed by the aging of the sealing device can not be effectively improved, and the gas flowing into the opposite side of the flow channel of the connecting gas channel or the gas flowing out from the opposite electrode is prevented from crossing the overflow ( The phenomenon of overflow ensures that the cathode and anode of the fuel cell are isolated from each other to prolong the life of the fuel cell. 1299593 BRIEF DESCRIPTION OF THE DRAWINGS The first drawing shows a partial cross-sectional perspective view of a first embodiment of the present invention. The second figure shows a partial cross-sectional view from the first line 2-2. The third figure shows a partial cross-sectional view of the second line 3-3. The fourth figure shows a front view of a first embodiment of the present invention. The fifth drawing shows a front view of a second embodiment of the present invention. The sixth figure shows a schematic diagram of the anodization reaction and the cathodic reduction reaction of the proton exchange membrane fuel cell. The seventh figure shows a schematic diagram of the basic composition of a proton exchange membrane fuel cell. The eighth figure shows a schematic diagram of the fluid flow inside the proton exchange membrane fuel cell. The ninth figure shows a schematic view of a proton exchange membrane fuel cell which is pressed by a conventional sealing device. The tenth figure shows a schematic view of the ninth figure in which the conventional sealing device presses the gap to cause the gas to cross over the overflow. [Main component symbol comparison description] 10...bipolar plate 11...rib 12...gas flow path 13...groove 14...electrode group 20...sealing device 21...protrusion F...compression force