1222765 玖、發明說明： 【發明所屬之技術領域】 本發明係關棚料電池之雙極板；_是關 料電池之—種具備反應氣體流道與 以金屬板部分做為雙極板的兩極之間電流傳導的介質成並 【先前技術】 燃料電池係-種高效率的能源轉換裝置，在 陰極供铺，即可藉由電化學反應將轉的轉能 其所使_鋪可錢氣或㈣組後献觀 為氧氣妓氣。若以氫氣為燃料則燃料電池的產物=而電 月,和熱月色，故燃料電池可說是一種低污染甚至零污染的發電裝置。 電池般狄4早電池』。燃料電池的單電 二隔二=板的兩面各有平行的溝槽做為輸送反 中-面的“ ’可將燃料均勻地輸送至單電池陽極的各部分；另一面 的流暹，氧化_勻地觀至相料f池陰極的各個部分。 換ίΓ料電池的雙極板，通f以厚度為3〜4mm左右的石 碎裂、重量大等缺點板有成本面、加工困難、使用時容易 當姑，利用賴製程，將之加工成雙極板的做法，亦 ㈣木用。例如美國專利公告第娜，43 及中華民_公告第4_、華7號，皆曾揭露利用金ςϊ 6 壓製成雙極板之相關技術，其流道有沖壓成弧形波、三角波、正方波、 梯形波等各種波浪狀。圖1、圖2分別為中華民國專利公告第481，937 唬和美國專利公告第5,616,431號之燃料電池剖面結構示意圖；圖3 為美國專利公告第6,503,653之燃料電池雙極板的剖面圖。此種結構 之雙極板雖然加jl料，但是亦有其缺點。若以不鏽鋼板為材料，因 電解質容易使鋼材腐蝕，導致燃料電池的内電阻增大，同時亦將污染 電解質或觸媒，故耐久性不佳。而以韻㈣金屬（例如：鈦或其合 金）薄板為材料，則成本甚高。若以金屬板經沖壓成型後，再鍍上黃 金或氮化鈦，因所鍍面積廣大，亦有成本高昂的缺點。 此外’亦有利用導電材料（例如石墨粉或碳粉）和塑膠材料攪拌 混合成泥漿狀後，再以模注成型方法，做成複合材料的雙極板者，例 如美國專利公告第6, 248, 467、6, 039, 852號皆曾揭露此種技術。唯 導電材料所佔的比例高時，做成的雙極板強度差；反之，導電材料所 佔的比例低時，則雙極板導電效果不佳，故此種雙極板仍有其待改進 的缺點。 一般質子交換膜燃料電池的效率約在40%〜50%之間，亦即燃料 的化學能有40%至50%可轉換成電能，而一半以上則變成熱能，若 燃料電池的散熱效果不佳，則容易造成溫度過高，導致性能降低甚至 失效。一般而言，功率250瓦以上的質子交換膜燃料電池，需要每隔 兩個單電池即設置一個冷卻流道板，並以空氣進行冷卻；功率2.5仟 瓦以上者，則更需以冷卻液進行冷卻，以確保燃料電池不發生過熱。 先前技術中通常設置獨立的冷卻流道板，因此燃料電池的體積與 重量明顯的加大，其功率密度則隨之降低。有的燃料電池將冷卻流道 與雙極板結合，以省卻獨立的冷卻流道板，同時可獲得良好的冷卻效 果。例如美國專利公告第5,776,624號揭露利用黃銅焊接的方法，將 雙極板與冷卻流道板結合在一起的技術；中華民國專利公告第 466,792號亦為雙極板與冷卻流道板結合為一體之結構。惟該等先前 技術利用金屬板沖壓成型，雖解決了設置獨立流道板而造成體積、重 Ϊ222765 篁加大的問題’但是仍有一般以沖壓成型金屬板做為雙極板之共同缺 點。 【發明内容】 目前燃料電池的雙極板仍然佔有燃料電池生產成本中很大的比 重’若能以較低的生產成本，製造出不易碎裂、耐腐#、導電性佳、 重量輕的雙極板，將可大幅降低_電池的價袼，延細料電池的壽 〒，促使燃料電池這種綠色發電裝置早日普遍化，以減輕環境污染的 問題。 本發明著眼於金屬板與塑膠材料，兩者皆具有料加工且價格低 廉的特性，利用金屬板沖壓形成凹凸波浪狀，並將塑膠材料與之結合 成具有陰極流道、陽極流道、冷卻流道之雙極板‘此形成之雙極板， 有成本低、製造谷易、耐腐钱、導電性佳、重量輕、耐衝擊等優點， 將可為燃料電池產業解決諸多問題。… 本發明的目的，在於提供一質子交換膜燃料電池之雙極板，該雙 2板的兩面，除了分別形成陽極與陰極的流道之外，亦設有冷卻流體 t之/令卻〃^道。將冷卻流道與雙極板整合為一體，有減少燃料電池 體積、重量與提升燃料電池散熱效果的功效。 ^本發明的另一目的，在於提供一質子交換膜燃料電池之雙極板， =極板係由金屬㈣貞責電流料玉作，金屬板除了做為良好的導 電介質之外，亦對陽極和陰極的反應氣體做好完善的隔離。 本發明的最後一個目的，在於提供一質子交換膜燃料電池之雙極 板，該雙極板之娜材料包覆金料社部分區域，雙極板用來與 電極接觸的部分未以娜㈣包覆，触小區域财黃金或鈦等耐腐 钱之金屬以形祕護膜。如此構造之雙極板，具有耐雜、堅動而耐 衝擊之特點。 【實施方式】 通常根據本發明，該最錄極板係包括巾央 行之反絲舰道，周賴域 應乳體，進、出σ外，其餘部分呈平面狀。在構造方面， 由沖壓威型之金屬材料部分與歸材料部分結合而成'ϋ = 料界定出反應氣體的流道，並由塑膠材料與金屬板共同界定 ^1222765 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a bipolar plate for a battery; _ is a material for a battery—a type of bipolar plate with a reaction gas flow channel and a metal plate as a bipolar plate Convergence of current-conducting media [Prior technology] Fuel cell system-a high-efficiency energy conversion device, which can be laid on the cathode, which can be converted by the electrochemical reaction. After the group, they watched as oxygen prostitutes. If hydrogen is used as the fuel, the product of the fuel cell is equivalent to the electric moon and the hot moon, so the fuel cell can be said to be a low-polluting or even pollution-free power generation device. Battery like Di 4 early battery. " The fuel cell's single-electricity, two-separate two-electrode = two sides of the plate have parallel grooves for transporting the anti-mid-face ", which can evenly transport the fuel to each part of the anode of the cell; the other side of the flow, oxidation_ Observe all parts of the cathode of the phase cell F evenly. Replace the bipolar plate of the battery, and use the stone with a thickness of about 3 ~ 4mm to break the stone, and the weight is short. The plate has cost, difficulty in processing, and use. It is easy to be a lover, and the method of processing the bipolar plates by using the Lai process is also used for wood. For example, U.S. Patent Publication No. 43 and Chinese People's Republic of China Announcement No. 4_ and Hua No. 7 have all disclosed the use of gold. 6 The related technology of pressing into bipolar plates, the flow channels of which are stamped into various wave shapes such as arc waves, triangle waves, square waves, trapezoidal waves, etc. Figures 1 and 2 are the Republic of China Patent Bulletin No. 481,937 and the U.S. Patent Schematic diagram of the fuel cell cross-section structure of Announcement No. 5,616,431; Figure 3 is a cross-sectional view of the fuel cell bipolar plate of U.S. Patent Publication No. 6,503,653. Although bipolar plates of this structure have jl materials, they also have their disadvantages. If stainless steel Plate as material, due to electrolysis It is easy to corrode steel, leading to an increase in the internal resistance of fuel cells, and it will also pollute electrolytes or catalysts, so the durability is not good. The use of thin plates of rhyme metal (such as titanium or its alloys) as the material has a high cost .If the metal plate is stamped and then plated with gold or titanium nitride, it has the disadvantage of high cost because of the large area. In addition, there are also conductive materials (such as graphite powder or carbon powder) and plastic materials. After mixing and mixing into a slurry, and then molding the composite bipolar plate by injection molding, such as U.S. Patent Publication Nos. 6,248, 467, 6, 039, 852 have disclosed this technology. Only conductive When the proportion of the material is high, the strength of the bipolar plate is poor; on the other hand, when the proportion of the conductive material is low, the conductivity of the bipolar plate is not good, so this kind of bipolar plate still has its shortcomings to be improved. Generally, the efficiency of proton exchange membrane fuel cells is between 40% and 50%, that is, 40% to 50% of the chemical energy of the fuel can be converted into electrical energy, and more than half of it can be converted into thermal energy. If the fuel cell's heat dissipation effect is not good , It is easy to cause If the temperature is too high, the performance will decrease or even fail. In general, a proton exchange membrane fuel cell with a power of 250 watts or more requires a cooling channel plate every two single cells and is cooled by air; the power is 2.5 watts In the above, it is necessary to use a cooling liquid for cooling to ensure that the fuel cell does not overheat. In the prior art, an independent cooling channel plate was usually provided, so the volume and weight of the fuel cell increased significantly, and its power density followed. Reduced. Some fuel cells combine cooling channels with bipolar plates to eliminate the need for independent cooling channel plates, while achieving good cooling results. For example, U.S. Patent Publication No. 5,776,624 discloses the use of a brass welding method to combine the two The technology of combining the electrode plate and the cooling channel plate; the Republic of China Patent Publication No. 466,792 is also a structure in which the bipolar plate and the cooling channel plate are integrated into one. However, these prior technologies use metal sheet stamping to solve the problem of increasing the size and weight of the independent flow channel plate (222,222). However, there are still common shortcomings of stamping and forming metal plates as bipolar plates. [Summary of the Invention] At present, the bipolar plates of fuel cells still occupy a large proportion of the production costs of fuel cells. If low production costs can be used, bipolar plates that are not easily broken, are resistant to corrosion, and have good conductivity and light weight The electrode plate will greatly reduce the price of the battery, extend the life of the fine battery, and promote the early universalization of green power generation devices such as fuel cells to reduce the problem of environmental pollution. The invention focuses on metal plates and plastic materials, both of which have material processing and low price characteristics. The metal plate is pressed to form a concave-convex wave shape, and the plastic material is combined with the cathode material flow channel, the anode flow channel, and the cooling flow. The bipolar plate of Dao 'This bipolar plate has the advantages of low cost, easy manufacturing, corrosion resistance, good conductivity, light weight, and impact resistance, and will solve many problems for the fuel cell industry. … The object of the present invention is to provide a bipolar plate for a proton exchange membrane fuel cell. In addition to forming the anode and cathode flow channels on both sides of the double 2 plate, the cooling fluid t is also provided. Road. Integrating the cooling channel with the bipolar plate has the effect of reducing the size and weight of the fuel cell and improving the heat dissipation effect of the fuel cell. ^ Another object of the present invention is to provide a bipolar plate for a proton exchange membrane fuel cell. The electrode plate is made of a metal sintered current material. The metal plate is not only a good conductive medium, but also an anode. Completely isolated from the cathode reaction gas. A final object of the present invention is to provide a bipolar plate of a proton exchange membrane fuel cell. The bipolar plate is coated with a nano-material, and a part of the metal material is covered. Cover, touch a small area of gold or titanium and other corrosion-resistant metals to form a secret film. The bipolar plate thus constructed has the characteristics of resistance to impurities, movement and impact. [Embodiment] Generally, according to the present invention, the most recording pole system includes the anti-filament shipway of the towel center, and the Zhou Laiyu should be a milk body. In terms of structure, it is formed by combining the punched-type metal material part and the return material part. Ϋ = material defines the flow path of the reaction gas, and is jointly defined by the plastic material and the metal plate ^
體之流道，而金屬糊做為雙極板的兩極之間電流傳導的介質^ P/”L 圖4所示為本發明之最佳實施例的雙極板平面示意圖。該雙極 (3)的正反兩面，設有輸送燃料電池所需之反應氣體的流道⑺ 圖中所顯示者為供艇極所需氧氣之氧氣離(31)，反面未顯 陽極之氫氣流道(32)，兩者具有相同的幾何形狀。相鄰兩條_間的And the metal paste serves as a medium for conducting current between the two poles of the bipolar plate ^ P / ”L FIG. 4 is a schematic plan view of a bipolar plate according to a preferred embodiment of the present invention. The bipolar (3 The front and back sides of) are provided with flow channels for the reaction gas required for fuel cells. The picture shows the oxygen ion (31) for the oxygen required by the boat pole, and the hydrogen flow path without anode on the reverse side (32) , The two have the same geometry.
長條狀部分，係雙極板(3)用來與電極接觸並導引電流的集電肋 (33)。 ” U 燃料電池堆所供應的氧氣，係由氧氣進氣口（1〇1)進入氧氣流道 (31)，藉由氧氣在流道中流動，將氧氣輸送至陰極電極的各個部分^ 未用完的氧氣以及陰極產生的水蒸氣，則經由氧氣排氣口⑽)排出。 雙極板(3)之左上與右上兩個開口，則為反面之陽極氫氣進氣口 (201) ’而上方中間開口，則為陽極之氫氣排氣口(2〇2)。 、 相鄰的兩條反應氣體流道，在其一端設有橫向的迴轉部(34)，用 以連接兩條流道。雙極板(3)之左、右兩侧邊緣部分，為未設有反應氣 體流道(31、32)及冷卻流道(37)之左、右周緣部(38);雙極板(3)之上、 下邊緣部分，則為未設有反應氣體流道(31、32)，但内部設有冷卻流 道(37)之上、下周緣部(39)。 本發明之雙極板，係由沖壓成型之金屬板部分與塑膠材料部分結 合而成，圖5所顯示者，即為雙極板(3)之金屬板部分的透視圖\金屬 板(4)的中間部分沖壓成凹凸波浪狀，周緣則設有配合氧氣和氫氣之 進、排氣口的開孔（101'、102’、201’、202')，以及確保正反兩面塑 膠穩固結合之水平開孔(42)。金屬板(4)的上、下周緣部(39，)之凹凸落 ϋ、於分之凹凸落差，因此形成之雙極板(3)的上、下周緣部 可7金屬板隱藏在塑膠材料的内部。此外，集電肋條(33)爲 部(34)之形成，在其_端有長度方向的退縮，故 條⑼ 在長度方面呈現參差不齊的樣態。 條⑼ 柄雷ίί屬板(4)的—角設有—突出部(41)，該突出部(41)可做為雙極 卫時的電極接頭；此—突出部⑼亦有另外的功能，即是電 /隹中右有某_單電池損壞時，亦可糊導線將與該故障單電池相 之兩個正常單電池的突出部(41)加以連接，如此則電池堆中縱 電池故障，電池堆仍可繼續運轉使用。 、 塑膠材料與金屬板的結合可採卿合、瓣射出成贱壓縮成型 ^見的加卫方法’爲制娜材料於射出越過程巾料貫通各個 部位’以及為使雙極板之瓣材料部分能穩ϋ地結為-體，於凹凸波 浪狀之直立部⑽開設有垂直開孔⑽。該垂直開孔(3ό)可為長方形、 ，形、橢圓形等幾何形狀。圖6所示為金屬板⑷的凹凸波浪狀的直立 邛(35)與垂直開孔(36)的構造。 圖7所示為沿圖4中之7_7剖線所得之部分剖面示意圖。 由塑膠材料界定出氧氣流道⑼和氫氣流道(32)，並且由金屬板 塑膠材料共同界定出冷卻流體流道(37)，圖7之左侧部分為不里有^ ，和集電肋條之周緣部(38)。最左邊的兩條集電肋細），因氧氣^ 氣口(101)與氣氣進氣口(201)設於其兩端，故内部未設冷卻流道 發明之雙極板’其师材料包覆金屬板材之大部麵積，僅有突 (41)以及集電肋條(33)之接觸部(333、334)的内、外兩面未被塑膠_ 所包覆。由於在燃料電池中，接觸部(333、334)之外表面鱗極緊密 接觸，容㈣腐麵污雜子交賊或電極巾_媒，以及增加 電池之内電阻，故板之金_分_歸騎合之後，可在接 部(333、334)之外表面鑛上财雜之金屬，例如黃金或鈦等。接觸部 (333、334)外表面之面積有限，故可大幅降低耐腐*金紐層之成本， 與整片鑛上貴重金屬的習知技術相較，本發明具有歸的進步性。 1222765 比本實施例中，氧氣流道(31)、氳氣流道(32)和冷卻流道(37)之橫截 面白呈半_，當亦可制其他常見賴何形狀之流道，如三角形、 梯形等。 立圖8所不為沿圖4中之8-8剖線所得之部分剖面示意圖。心8剖 線部分為雙極板之具有冷卻流道(37)的周緣部(39)。在此周緣部分， 無反應氣體之流道，故冷卻流道以外的部分，全部填充塑膠材料，且 金屬?被娜材料包覆。冷卻流體可*冷卻流道⑼之―端流入（圖 4之最下方）’貫通冷卻流道(37)後，再由冷卻流道(3乃之另一端流出 (圖4之最上方）’藉此帶走燃料電池產生的熱量，以達到燃料電池 散熱的目的。 圖9所示為沿圖4中之9-9剖線所得之部分剖面示意 圖。圖9上 方中間部分為反應氣體流道之迴轉部(34)，該迴轉部(34)係利用金屬 板(4)之集電肋條(33)與周緣部(39')之間的段差，配合塑膠材料於該處 ^凹陷而形成。冷卻流道(37)於圖9之左方較低，於圖9之右方則較 高，在迴轉部(34)下方附近有一轉彎處。 本發明之另一實施例為：雙極板不設冷卻流道，金屬板之凹凸波 浪狀的内凹部份，除利用塑膠材料形成反應氣體的流道之外，其餘部 分皆以塑膠材料填充。圖10與圖n所示分別為本實施例施行下，、圖 4中之7-7與8-8剖線所得之部分剖面示意圖。 綜上所述，本發明利用金屬板與塑膠材料容易加工的特性，將沖 壓成型之金屬板部分與塑膠材料部分結合成雙極板，其中利用塑膠材 料於金屬板凹陷部之開口端形成反應氣體流道，於閉合端與金屬板共 同形成冷卻流道，並於集電肋條用來與電極接觸部分之外表面鍍上^ 腐蝕之金屬。此一複合材料構成之燃料電池雙極板，具有生產^本低 廉、製造容易、耐腐蝕、導電性佳、散熱效果佳、重量輕、耐衝擊等 優點，具有產業上之利用性；先前技術中，未見此種構造之燃料電池 雙極板者，本發明亦具有新穎性；相較於先前技術，本發明更具有進 步性，爰依專利法第二十條之規定，提出發明專利申請。 11 1222765 【主要部分代表符號說明】 1 陰極之電極 3 雙極板 5 質子交換膜 11陰極之擴散層 21陽極之擴散層 31陰極之氧氣流道 33集電肋條 35 直立部 37冷卻流道 39雙極板之上、下周緣部 金屬板之上、下周緣部 42水平開孔 102氧氣排氣口 202氫氣排氣口 102金屬板之氧氣排氣口開孔 202'金屬板之氫氣排氣口開孔 2 陽極之電極 4 金屬板 12陰極之觸媒層 22陽極之觸媒層 32陽極之氫氣流道 34流道之迴轉部 36垂直開孔 38雙極板之左、右周緣部 38,金屬板之左、右周緣部 41突出部 101氧氣進氣口 201氫氣進氣口 10Γ金屬板之氧氣進氣口開孔 20Γ金屬板之氫氣進氣口開孔 333、334集電肋條之接觸部 【圖式簡單說明】 圖1為中華民國專利公告第481,937號之燃料電池剖面結構示意圖； 圖2為美國專利公告第5,616,431號之燃料電池剖面結構示意圖； 圖3為美國專利公告第6,5〇3,653號之燃料電池雙極板之剖面圖； 圖4為本發明最佳實施例之平面示意圖； 圖5係本發9歸佳實酬之金屬板透視圖； 圖6係金屬板凹凸波浪狀之直立部開孔示意圖； 12 圖7為圖4中7-7剖線所得之部份剖面示意圖； ® 8為圖4中8_8剖線所得之部份剖面示意圖； 圖9為圖4中9-9剖線所得之部份剖面示意圖； 圖10為本發明之另一實施例施行下，圖4中7-7剖線所得之部严本】 面示意圖； ° 圖11為本發明之另一實施例施行下，圖4中8-8剖線所得之部份剖面 示意圖。The long strip-shaped part is a current collecting rib (33) for the bipolar plate (3) to contact the electrodes and guide the current. The oxygen supplied by the U fuel cell stack enters the oxygen flow path (31) from the oxygen inlet (101), and the oxygen flows through the flow path to transport the oxygen to various parts of the cathode electrode. ^ Not used up The oxygen and water vapor produced by the cathode are discharged through the oxygen exhaust port ⑽). The upper left and upper right openings of the bipolar plate (3) are the anode hydrogen inlet (201) on the opposite side and the upper middle opening. , It is the hydrogen exhaust port (202) of the anode. 2. Two adjacent reaction gas flow channels are provided with a lateral turning portion (34) at one end for connecting the two flow channels. Bipolar plate (3) The left and right edge portions are the left and right peripheral edge portions (38) without reactive gas flow channels (31, 32) and cooling flow channels (37); above the bipolar plate (3) The lower edge part is not provided with a reaction gas flow channel (31, 32), but the cooling flow channel (37) is provided inside and the lower peripheral edge portion (39) is provided. The bipolar plate of the present invention is stamped The formed metal plate part is combined with the plastic material part. The one shown in Figure 5 is a perspective view of the metal plate part of the bipolar plate (3) \ the middle part of the metal plate (4) It is stamped into a concave-convex wave shape, and the periphery is provided with openings (101 ', 102', 201 ', 202') that match the inlet and outlet of oxygen and hydrogen, and horizontal openings to ensure the positive and negative plastic on both sides. (42). The unevenness of the upper and lower peripheral edges (39,) of the metal plate (4) is uneven, and the unevenness of the unevenness is different, so the upper and lower peripheral edges of the formed bipolar plate (3) can be hidden by 7 metal plates. Inside the plastic material. In addition, the current collecting rib (33) is formed by the part (34), and there is a shrinkage in the length direction at the _ end, so the stripe has an uneven appearance in terms of length. The corner of the plate (4) is provided with a protruding portion (41), which can be used as an electrode connector of the bipolar guard; this-protruding portion ⑼ also has another function, which is electrical / There is a _ in the center right. When the single battery is damaged, you can also paste a wire to connect the protrusions (41) of the two normal single batteries with the faulty single battery. In this way, the vertical battery in the battery stack fails, and the battery stack can still be used. Continue to use it. The combination of plastic materials and metal plates can be combined, and the petals can be shot into a low-pressure compression molding method. In order to make the flap material part of the bipolar plate stably form a-body, a vertical opening hole 于 is opened at the upright portion of the concave-convex shape. The vertical opening The holes (3ό) can be rectangular, rectangular, oval, or other geometric shapes. Figure 6 shows the structure of the embossed and wavy uprights (35) and vertical openings (36) of the metal plate ⑷. Figure 7 shows Partial cross-sectional schematic diagram taken along line 7_7 in Fig. 4. The oxygen flow channel ⑼ and the hydrogen flow channel (32) are defined by a plastic material, and the cooling fluid flow channel (37) is defined by a metal plate plastic material, Fig. 7 The left part is ^, and the peripheral part (38) of the collector rib. The two left-most collector ribs are thin), because the oxygen ^ air port (101) and the gas air inlet (201) are provided at its two ends, so there is no bipolar plate invented by the cooling channel. For the large area of the metal-clad sheet, only the inner and outer surfaces of the protrusions (41) and the contact portions (333, 334) of the current collecting ribs (33) are not covered by plastic. In the fuel cell, the scales on the outer surface of the contact part (333, 334) are in very close contact, and the rotten surface is stained with dirt or electrodes. The medium and the internal resistance of the battery are increased, so the gold of the plate is _minute_ After returning to the riding, you can deposit rich metals such as gold or titanium on the surface outside the joints (333, 334). The area of the outer surface of the contact portion (333, 334) is limited, so the cost of the anti-corrosion * gold button layer can be greatly reduced. Compared with the conventional technology of precious metals on the entire ore, the present invention has the improved progress. 1222765 Compared with this embodiment, the cross section of the oxygen flow path (31), the radon flow path (32) and the cooling flow path (37) is half white. When the flow path is formed in other common shapes, such as a triangle , Trapezoidal, etc. Fig. 8 is not a partial cross-sectional view taken along the line 8-8 in Fig. 4. The cross section of the core 8 is a peripheral portion (39) of the bipolar plate having a cooling channel (37). In this peripheral part, there is no flow path for the reaction gas, so the parts other than the cooling flow path are filled with plastic material, and the metal is covered with the nano material. The cooling fluid can flow into the end of the cooling flow channel (the bottom of Figure 4) 'through the cooling flow channel (37), and then from the cooling flow channel (3 or the other end (the top of Figure 4)' to borrow This takes away the heat generated by the fuel cell to achieve the purpose of heat dissipation of the fuel cell. Fig. 9 shows a partial cross-sectional view taken along the line 9-9 in Fig. 4. The upper middle part of Fig. 9 is the rotation of the reaction gas flow channel. The turning part (34) is formed by using a step difference between the current collecting rib (33) of the metal plate (4) and the peripheral part (39 '), and collapsing the plastic material at the place. Cooling flow The track (37) is lower on the left side of Fig. 9 and higher on the right side of Fig. 9, and there is a turn near the lower part of the turning part (34). Another embodiment of the present invention is that the bipolar plate is not provided with cooling The flow channel, the concave and convex wave-like concave portion of the metal plate, except for forming the flow channel of the reaction gas by using plastic materials, the rest are filled with plastic materials. Figures 10 and n respectively show the implementation of this embodiment. 、、 A part of the schematic cross-sectional diagram obtained by the 7-7 and 8-8 cross-sections in Fig. 4. In summary, the present invention uses a metal plate and The easy processing of glue material combines the stamped metal plate part and the plastic material part to form a bipolar plate. The plastic material forms a reaction gas flow channel at the open end of the recessed part of the metal plate, and is formed together with the metal plate at the closed end. Cool the flow channel and plate ^ corrosive metal on the outer surface of the current collector rib to contact the electrode. The fuel cell bipolar plate composed of this composite material has low production cost, easy manufacturing, corrosion resistance and electrical conductivity Good performance, good heat dissipation effect, light weight, impact resistance, etc., have industrial applicability; in the prior art, the fuel cell bipolar plate of this structure has not been seen, the present invention is also novel; compared with the previous Technology, the present invention is more advanced, according to the provisions of the twentieth patent law, filed an invention patent application. 11 1222765 [Description of the main part of the symbol] 1 cathode electrode 3 bipolar plate 5 proton exchange membrane 11 cathode diffusion Layer 21 anode diffusion layer 31 cathode oxygen flow channel 33 current collector rib 35 vertical portion 37 cooling flow channel 39 above and below the bipolar plate metal plate Upper and lower peripheral edges 42 horizontal openings 102 oxygen exhaust ports 202 hydrogen exhaust ports 102 oxygen exhaust port openings for metal plates 202 'hydrogen exhaust port openings for metal plates 2 anode electrodes 4 metal plates 12 cathodes Catalyst layer 22 Anode layer 32 Anode hydrogen flow path 34 Anode turning path 36 Vertical openings 38 Left and right peripheral edge portions 38 of the bipolar plate, Left and right peripheral edge portions 41 of the metal plate 101 Oxygen Air inlet 201 Hydrogen inlet 10Γ Oxygen inlet opening of metal plate 20Γ Hydrogen inlet opening of metal plate 333, 334 Contact point of collector ribs [Schematic description] Figure 1 is a patent announcement of the Republic of China Schematic diagram of the fuel cell cross-section structure No. 481,937; Figure 2 is a schematic diagram of the fuel cell cross-section structure of U.S. Patent Publication No. 5,616,431; Figure 3 is a cross-sectional view of the fuel cell bipolar plate of U.S. Patent Publication No. 6,505,653; 4 is a schematic plan view of the preferred embodiment of the present invention; FIG. 5 is a perspective view of the metal plate of the present invention 9; FIG. 6 is a schematic view of openings in the embossed and wavy upright portion of the metal plate; FIG. 7-7 Partial cross-section diagram ® 8 is a partial cross-sectional view obtained by the 8-8 line in FIG. 4; FIG. 9 is a partial cross-sectional view obtained by the 9-9 line in FIG. 4; FIG. 10 is another embodiment of the present invention. 7-7 is a schematic diagram of the part taken from the section line; ° FIG. 11 is a schematic diagram of a part of the section obtained from the section 8-8 in FIG. 4 under the implementation of another embodiment of the present invention.
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