JPH05290859A - Cooling plate for fuel cell - Google Patents

Cooling plate for fuel cell

Info

Publication number
JPH05290859A
JPH05290859A JP4083540A JP8354092A JPH05290859A JP H05290859 A JPH05290859 A JP H05290859A JP 4083540 A JP4083540 A JP 4083540A JP 8354092 A JP8354092 A JP 8354092A JP H05290859 A JPH05290859 A JP H05290859A
Authority
JP
Japan
Prior art keywords
cooling
fuel cell
cooling plate
cooling pipe
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4083540A
Other languages
Japanese (ja)
Inventor
Takamasa Mitsuzuka
隆正 三塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP4083540A priority Critical patent/JPH05290859A/en
Publication of JPH05290859A publication Critical patent/JPH05290859A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

Abstract

PURPOSE:To improve cooling performance and reliability of a cooling plate for a fuel cell, and reduce processing cost of it. CONSTITUTION:Coating 11 of heat-resistant and corrosion-resistant resin is applied to an outer surface of a cooling tube 10 disposed in a cooling tube holding groove 3. For material of this coating, PFA (tetrafluoro ethylene- parfluoro alkylvinyl ether copolymer), PFA including filler such as carbon or glass fibers, FEP (tetrafluoro-ethylene-hexafluoropropylene copolymer), FEP including filler such as carbon or glass fiber, etc., can be used.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、燃料電池用冷却板に係
り、特に、冷却板に内蔵される冷却管の電解質による腐
食を防止することができるように改良を施した燃料電池
用冷却板に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling plate for a fuel cell, and more particularly to a cooling plate for a fuel cell improved so as to prevent corrosion of a cooling pipe built in the cooling plate due to an electrolyte. It is about.

【0002】[0002]

【従来の技術】燃料電池は、燃料のもつ化学エネルギー
を、電気化学プロセスで酸化させることにより、酸化反
応に伴って放出されるエネルギーを、直接電気エネルギ
ーに変換する装置である。この燃料電池を用いた発電シ
ステムは、比較的小さな規模であっても、発電の熱効率
が40〜50%にも達し、新鋭火力発電をはるかにしの
ぐと期待されている。
2. Description of the Related Art A fuel cell is a device that directly oxidizes the chemical energy of a fuel in an electrochemical process to directly convert the energy released by the oxidation reaction into electrical energy. A power generation system using this fuel cell is expected to have a thermal efficiency of 40 to 50% even in a relatively small scale and far surpass new power generation.

【0003】また、近年大きな社会問題になっている公
害要因であるSOx 、NOx の排出が極めて少なく、発
電装置内に燃料サイクルを含まないため、大量の冷却水
を必要とせず、振動も小さいことなどから、騒音・排ガ
ス等の環境問題が少ないという利点がある。さらに、負
荷変動に対して応答性が良く、原理的に高い変換効率が
期待できる等の特徴があることから、その研究・開発に
期待と関心が寄せられている。
Further, since the emission of SO x and NO x , which are pollution factors which have become a big social problem in recent years, is extremely small and the power generator does not include a fuel cycle, a large amount of cooling water is not required and vibration is generated. Since it is small, there is an advantage that there are few environmental problems such as noise and exhaust gas. Furthermore, since it has characteristics such as good responsiveness to load fluctuations and high conversion efficiency in principle, it is expected that research and development will be expected.

【0004】この種の装置としては、たとえば、特開昭
60−93765号公報に示されたものが知られてい
る。即ち、電池本体は、発電のために用いられる多数の
セルとこれらのセルで発生する熱を排出するための冷却
板の積層体、反応ガス供給・排出用マニホールド、冷却
水供給・排出用マニホールド等によって構成され、前記
セルには燃料ガスと空気が、一方、冷却板には水等の冷
媒が、外部から供給・排出されるように構成されてい
る。
An apparatus of this type is known, for example, from Japanese Patent Application Laid-Open No. 60-93765. That is, the battery body includes a stack of a large number of cells used for power generation and cooling plates for discharging heat generated in these cells, a reaction gas supply / discharge manifold, a cooling water supply / discharge manifold, etc. The fuel cell and the air are supplied to the cells, and the cooling plate is supplied with a coolant such as water from the outside.

【0005】また、前記冷却板は、図3及び図4に示し
た様に、上下2枚の炭素板1a,1bから成る冷却板基
板1より構成され、それぞれの対向面には、冷却板に内
蔵される冷却管2を収納するための冷却管保持溝3が形
成されている。この冷却管保持溝3は断面形状が半円形
をなし、上下2枚の炭素板1a,1bを接合した時に、
冷却管2のサイズと略同一のパイプ状となるように構成
されている。また、前記冷却管2は、ステンレス、銅等
の金属から構成され、前記冷却管保持溝3内に配設され
ている。
Further, as shown in FIGS. 3 and 4, the cooling plate is composed of a cooling plate substrate 1 composed of two upper and lower carbon plates 1a and 1b. A cooling pipe holding groove 3 for accommodating the built-in cooling pipe 2 is formed. The cooling pipe holding groove 3 has a semicircular cross section, and when the upper and lower carbon plates 1a and 1b are joined,
It is configured to have a pipe shape that is substantially the same as the size of the cooling pipe 2. The cooling pipe 2 is made of metal such as stainless steel and copper, and is arranged in the cooling pipe holding groove 3.

【0006】[0006]

【発明が解決しようとする課題】しかしながら、上記の
様な構成を有する従来の燃料電池用冷却板には、以下に
述べる様な解決すべき課題があった。即ち、冷却板は、
電解質を含浸させた電極の間に積層されるため、冷却板
基板1を通常の炭素板により構成すると、内部に電解質
が浸透し、冷却管2の外表面が腐食する。
However, the conventional fuel cell cooling plate having the above-mentioned structure has the following problems to be solved. That is, the cooling plate
When the cooling plate substrate 1 is made of a normal carbon plate, it is laminated between the electrodes impregnated with the electrolyte, so that the electrolyte penetrates into the inside and the outer surface of the cooling pipe 2 is corroded.

【0007】これを防止するために、従来から種々の方
法が提案されている。例えば、冷却管2にフッ素樹脂製
熱収縮チューブ4を被せる方法が用いられているが、燃
料電池が大型化すると冷却管は長大化するにもかかわら
ず、冷却管の曲げ半径は余り変わらないため、冷却管を
上記熱収縮チューブ4に挿入することが困難なものとな
る。また、たとえ挿入できたとしても、熱膨脹等により
熱収縮チューブ4にクラックが入り、電解質によって冷
却管が腐食するという不具合が生じるため、長期的な信
頼性に乏しいものであった。
In order to prevent this, various methods have been conventionally proposed. For example, a method of covering the cooling pipe 2 with the heat shrinkable tube 4 made of fluororesin is used, but the bending radius of the cooling pipe does not change much even though the cooling pipe becomes longer as the fuel cell becomes larger. However, it becomes difficult to insert the cooling pipe into the heat-shrinkable tube 4. Even if it could be inserted, the heat shrinkable tube 4 was cracked due to thermal expansion and the cooling tube was corroded by the electrolyte, resulting in poor long-term reliability.

【0008】また、冷却板基板1にフッ素樹脂等の撥水
性材料を含浸させる方法も採られているが、この方法も
長期的信頼性に乏しいものであった。
Although a method of impregnating the cooling plate substrate 1 with a water-repellent material such as a fluororesin has been adopted, this method also has a poor long-term reliability.

【0009】本発明は、上記の様な従来技術の欠点を解
消するために提案されたもので、その目的は、冷却板の
冷却性能及び信頼性の向上を可能とし、加工コストの低
減を可能とした燃料電池用冷却板を提供することにあ
る。
The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and the purpose thereof is to improve the cooling performance and reliability of the cooling plate and to reduce the processing cost. And to provide a cooling plate for a fuel cell.

【0010】[0010]

【課題を解決するための手段】本発明は、電解質層を挟
んで配置された一対の多孔質電極から成るセルと共に積
層され、冷媒を流す冷却管を内蔵した燃料電池用冷却板
において、前記冷却管の外表面に、電解質に対する耐食
性を有する被膜を形成したことを特徴とするものであ
る。
The present invention provides a cooling plate for a fuel cell, which is laminated with a cell composed of a pair of porous electrodes sandwiching an electrolyte layer and has a cooling pipe for flowing a cooling medium therein, wherein the cooling is performed. It is characterized in that a film having corrosion resistance against an electrolyte is formed on the outer surface of the tube.

【0011】[0011]

【作用】本発明の燃料電池用冷却板においては、冷却管
の外表面に、電解質に対する耐食性を有する被膜を形成
したことにより、冷却管の電解質による腐食を防止する
ことができる。
In the cooling plate for a fuel cell of the present invention, the outer surface of the cooling pipe is formed with a film having corrosion resistance to the electrolyte, so that the corrosion of the cooling pipe due to the electrolyte can be prevented.

【0012】[0012]

【実施例】以下、本発明の一実施例を図1及び図2を参
照して具体的に説明する。なお、図3及び図4に示した
従来型と同一の部材には同一の符号を付して、説明は省
略する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. The same members as those of the conventional type shown in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

【0013】本実施例においては、図1及び図2に示し
た様に、冷却管保持溝3内に配設される冷却管10の外
表面に、耐熱・耐食性樹脂によるコーティング11が施
されている。このコーティング材料としては、PFA
(テトラフルオロエチレンーパーフルオロアルキルビニ
ルエーテル共重合体)、または、炭素、グラスファイバ
等の充填剤の入ったPFA、FEP(テトラフルオロエ
チレンーヘキサフルオロプロピレン共重合体)、また
は、炭素、グラスファイバ等の充填剤の入ったFEP等
が用いられる。
In this embodiment, as shown in FIGS. 1 and 2, the outer surface of the cooling pipe 10 disposed in the cooling pipe holding groove 3 is coated with a heat-resistant and corrosion-resistant resin 11. There is. As this coating material, PFA
(Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), or PFA or FEP (tetrafluoroethylene-hexafluoropropylene copolymer) containing a filler such as carbon or glass fiber, or carbon, glass fiber, etc. FEP or the like containing the filler is used.

【0014】また、コーティング方法としては、金属製
冷却管の外表面をサンドブラスト等によって下地処理
し、そのうえにプライマを焼き付け、さらに、その上に
PFAまたはFEP、あるいは炭素、グラスファイバ等
の充填剤の入ったPFAまたはFEP等のフッ素樹脂を
塗装し、その後、高温で焼き付けてコーティング層を形
成する方法が用いられる。
As a coating method, the outer surface of the metal cooling pipe is ground by sandblasting, a primer is baked on the outer surface, and PFA or FEP, or a filler such as carbon or glass fiber is put on the surface. A method is used in which a fluororesin such as PFA or FEP is coated and then baked at high temperature to form a coating layer.

【0015】この様な構成を有する本実施例の燃料電池
用冷却板は、以下に述べる様に作用する。即ち、上記の
PFA、FEP等のコーティング材料は、燃料電池の運
転温度程度の耐熱性を十分有し、また、電解質に対して
安定なため、冷却板基板内に電解質が浸透したとして
も、冷却板の内部に配設される冷却管10の腐食を防止
することができる。
The fuel cell cooling plate of this embodiment having such a structure operates as described below. That is, since the above coating materials such as PFA and FEP have sufficient heat resistance at the operating temperature of the fuel cell and are stable to the electrolyte, even if the electrolyte penetrates into the cooling plate substrate, the cooling material is cooled. Corrosion of the cooling pipe 10 arranged inside the plate can be prevented.

【0016】また、本実施例のコーティング材料は、冷
却管10に強固に焼き付けられているため、冷却管と冷
却板基板との間に熱による伸縮が生じても、剥がれるこ
とはない。さらに、上記コーティング材料は電気絶縁材
料であるため、冷却管と冷却板基板は絶縁されており、
冷却管への冷媒の供給・排出管を絶縁材料により構成す
る必要がなくなる。
Further, since the coating material of this embodiment is firmly baked on the cooling pipe 10, it does not peel off even if expansion and contraction due to heat occurs between the cooling pipe and the cooling plate substrate. Further, since the coating material is an electrically insulating material, the cooling pipe and the cooling plate substrate are insulated,
It is not necessary to form the supply and discharge pipes of the refrigerant to the cooling pipe with an insulating material.

【0017】なお、本発明は上述した実施例に限定され
るものではなく、冷却管への耐熱・耐食性被膜の形成方
法としては、フッ素ゴムを溶剤に溶かしたものを冷却管
に複数回塗布し、フッ素ゴムの塗膜を形成しても、上記
の実施例と同様の効果が得られる。また、フッ素ゴムと
上記フッ素樹脂コーティングを併用しても良く、さら
に、冷却管の場所によって、フッ素ゴムとフッ素樹脂コ
ーティングを使い分けても良い。
The present invention is not limited to the above-described embodiment, and as a method for forming a heat resistant / corrosion resistant coating on a cooling pipe, a solution of fluororubber dissolved in a solvent is applied to the cooling pipe a plurality of times. Even if a coating film of fluororubber is formed, the same effect as that of the above-mentioned embodiment can be obtained. Further, the fluororubber and the fluororesin coating may be used in combination, and the fluororubber and the fluororesin coating may be selectively used depending on the location of the cooling pipe.

【0018】[0018]

【発明の効果】以上述べた様に、本発明によれば、冷却
板に内蔵される冷却管の外表面に、電解質に対する耐食
性を有する被膜を形成することにより、冷却板の冷却性
能及び信頼性の向上を可能とし、加工コストの低減を可
能とした燃料電池用冷却板を提供することができる。
As described above, according to the present invention, the cooling performance and reliability of the cooling plate are improved by forming the coating film having the corrosion resistance against the electrolyte on the outer surface of the cooling pipe built in the cooling plate. It is possible to provide a cooling plate for a fuel cell, which can improve the manufacturing cost and reduce the processing cost.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の燃料電池用冷却板の一実施例を示す平
面図
FIG. 1 is a plan view showing an embodiment of a fuel cell cooling plate of the present invention.

【図2】図1の側面図FIG. 2 is a side view of FIG.

【図3】従来の燃料電池用冷却板の一例を示す平面図FIG. 3 is a plan view showing an example of a conventional fuel cell cooling plate.

【図4】図3の側面図FIG. 4 is a side view of FIG.

【符号の説明】[Explanation of symbols]

1…冷却板基板 2…冷却管 3…冷却管保持溝 4…熱収縮チューブ 10…冷却管 11…コーティング DESCRIPTION OF SYMBOLS 1 ... Cooling plate substrate 2 ... Cooling tube 3 ... Cooling tube holding groove 4 ... Heat shrink tube 10 ... Cooling tube 11 ... Coating

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 電解質層を挟んで配置された一対の多孔
質電極から成るセルと共に積層され、冷媒を流す冷却管
を内蔵した燃料電池用冷却板において、 前記冷却管の外表面に、電解質に対する耐食性を有する
被膜を形成したことを特徴とする燃料電池用冷却板。
1. A cooling plate for a fuel cell, which is laminated with a cell composed of a pair of porous electrodes sandwiching an electrolyte layer and has a built-in cooling pipe for flowing a cooling medium, wherein an outer surface of the cooling pipe is provided with respect to an electrolyte. A cooling plate for a fuel cell, characterized in that a coating having corrosion resistance is formed.
JP4083540A 1992-04-06 1992-04-06 Cooling plate for fuel cell Pending JPH05290859A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4083540A JPH05290859A (en) 1992-04-06 1992-04-06 Cooling plate for fuel cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4083540A JPH05290859A (en) 1992-04-06 1992-04-06 Cooling plate for fuel cell

Publications (1)

Publication Number Publication Date
JPH05290859A true JPH05290859A (en) 1993-11-05

Family

ID=13805344

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4083540A Pending JPH05290859A (en) 1992-04-06 1992-04-06 Cooling plate for fuel cell

Country Status (1)

Country Link
JP (1) JPH05290859A (en)

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