JPH0638339B2 - Cooling device for fuel cells - Google Patents
Cooling device for fuel cellsInfo
- Publication number
- JPH0638339B2 JPH0638339B2 JP61168724A JP16872486A JPH0638339B2 JP H0638339 B2 JPH0638339 B2 JP H0638339B2 JP 61168724 A JP61168724 A JP 61168724A JP 16872486 A JP16872486 A JP 16872486A JP H0638339 B2 JPH0638339 B2 JP H0638339B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- fuel cell
- cooling device
- fluorinated polymer
- graphite particles
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
- H01M8/04074—Heat exchange unit structures specially adapted for fuel cell
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は燃料電池用冷却装置に関するものである。TECHNICAL FIELD The present invention relates to a cooling device for a fuel cell.
第２図は、例えば特開昭58−166663号公報に示された従
来の燃料電池用冷却装置を示す断面図であり、図におい
て、(1)および(3)は対向する面の反対側にそれぞれ反応
ガス通路(2)，(4)が設けられている冷却板であり、材料
は主にグラファイトである。これら２枚の冷却板の間
に、冷却パイプ溝(6)が設けてあり、上記冷却パイプ溝
(6)に金属素材又は炭素素材よりなる冷却パイプ(5)が挿
入してある。(7)は上記冷却パイプ溝(6)と上記冷却パイ
プ(5)との間隙に充填されている充填剤である。FIG. 2 is a cross-sectional view showing a conventional fuel cell cooling device disclosed in, for example, Japanese Patent Application Laid-Open No. 58-166663, in which (1) and (3) are on the opposite side of the facing surface. These are cooling plates provided with reaction gas passages (2) and (4), respectively, and the material is mainly graphite. A cooling pipe groove (6) is provided between these two cooling plates, and the cooling pipe groove is formed.
A cooling pipe (5) made of a metal material or a carbon material is inserted in (6). (7) is a filler filled in the gap between the cooling pipe groove (6) and the cooling pipe (5).
冷却パイプ(5)の外面は、例えば特公昭53-33670号公報
に記載の誘電性材料からなる被膜(8)が形成されてい
る。On the outer surface of the cooling pipe (5), for example, a coating (8) made of a dielectric material described in JP-B-53-33670 is formed.
次にその作用を説明する。まず、燃料電池の起動時にお
いて、反応を促進するために、温水を冷却パイプ(5)内
に送り、被膜(8)、充填材(7)を介して冷却板(1)，(3)に
熱を伝え、冷却板(1)，(3)の上下に積層されている燃料
電池を加熱する。Next, the operation will be described. First, at the time of starting the fuel cell, in order to promote the reaction, hot water is sent into the cooling pipe (5), and the cooling plates (1) and (3) are supplied to the cooling plates (1) and (3) through the film (8) and the filler (7). The heat is transferred to heat the fuel cells stacked above and below the cooling plates (1) and (3).
定常の動作時において、温度上昇にともなう燃料電池の
過熱を防止するために、燃料電池で発生した熱を除去す
る必要がある。燃料電池で発生した熱は上下から冷却板
(1)，(3)に伝えられ、充填材(7)、被膜(8)を介して冷却
パイプ(5)に伝えられる。被膜(8)は、例えば特公昭58-3
3670号公報に記述されているように冷却パイプ(5)を電
解液から保護して、電解液による冷却パイプ(5)の腐食
を防止するために形成され、フッ素化ポリマーが用いら
れている。フッ素化ポリマーは金属に比べて熱伝導性が
悪く、冷却パイプ(5)の熱伝導性を著しく阻害する。During steady operation, it is necessary to remove heat generated in the fuel cell in order to prevent overheating of the fuel cell due to temperature rise. The heat generated by the fuel cell is cooled from above and below by the cooling plate.
It is transmitted to the cooling pipe (5) through the filler (7) and the coating (8). The coating film (8) is, for example, Japanese Patent Publication Sho 58-3.
As described in Japanese Patent No. 3670, it is formed to protect the cooling pipe (5) from the electrolytic solution and prevent corrosion of the cooling pipe (5) by the electrolytic solution, and a fluorinated polymer is used. The fluorinated polymer has poor thermal conductivity as compared with metal, and significantly impairs the thermal conductivity of the cooling pipe (5).
従来の燃料電池用冷却装置は以上のように構成されてい
るので、冷却パイプ(5)の被膜(8)、充填材(7)の熱抵抗
は、冷却板(1)，(3)、冷却パイプ(5)の熱抵抗に比べて
桁大きく、冷却板(1)，(3)と冷却パイプ(5)の間で大き
な温度差が生じ、そのためにセル温度が規定値を超えた
り、あるいは一つの冷却装置の能力が低下するために、
冷却装置の必要数が増えるなどの問題点があった。Since the conventional cooling device for a fuel cell is configured as described above, the thermal resistance of the coating film (8) of the cooling pipe (5) and the filling material (7) is determined by the cooling plates (1), (3), It is an order of magnitude larger than the thermal resistance of the pipe (5), and a large temperature difference occurs between the cooling plates (1) and (3) and the cooling pipe (5). Due to the reduced capacity of one refrigerator
There was a problem that the required number of cooling devices increased.
この発明は上記のような問題点を解消するためになされ
たもので、冷却パイプの被膜に熱伝導性のすぐれた材料
を用いることによって、伝導特性の優れた燃料電池用冷
却装置を提供することを目的とする。The present invention has been made to solve the above problems, and provides a cooling device for a fuel cell having excellent conduction characteristics by using a material having excellent thermal conductivity for the film of the cooling pipe. With the goal.
この発明に係る燃料電池用冷却装置は、冷却パイプを電
解質から保護し腐食を防止するのに十分な膜厚を有する
被膜を黒鉛質粒子とフッ素化ポリマーの混合体で形成し
たものである。The cooling device for a fuel cell according to the present invention comprises a mixture of graphite particles and a fluorinated polymer, the coating having a film thickness sufficient to protect the cooling pipe from the electrolyte and prevent corrosion.
この発明における燃料電池用冷却装置は、被膜を黒鉛質
粒子とフッ素化ポリマーの混合体で形成することにより
被膜自身の熱伝導率を高め、膜厚を薄くすることなく冷
却パイプの伝熱性能が向上する。The cooling device for a fuel cell in this invention enhances the thermal conductivity of the coating itself by forming the coating with a mixture of graphite particles and a fluorinated polymer, and the heat transfer performance of the cooling pipe is improved without reducing the film thickness. improves.
以下、この発明の一実施例を図について説明する。第１
図において、(1)，(5)，(6)は上述した従来装置の構成
と同様である。(9)は黒鉛質粒子とフッ素化ポリマーの
混合体で形成された被膜である。An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, (1), (5), and (6) are the same as the configuration of the conventional device described above. (9) is a film formed of a mixture of graphite particles and a fluorinated polymer.
冷却パイプの外面に被覆される被膜として求められる特
性としては、熱伝導性の良いこと、耐薬品性を持ってい
ること、耐熱性が良く、200 ℃前後でも物性が劣化しな
いことなどが挙げられる。このような観点より、黒鉛質
粒子とフッ素化ポリマーの混合体が適している。The properties required for the coating on the outer surface of the cooling pipe include good thermal conductivity, chemical resistance, good heat resistance, and no deterioration of physical properties even at around 200 ° C. . From such a viewpoint, a mixture of graphite particles and a fluorinated polymer is suitable.
黒鉛質粒子は例えば直径２〜10μｍ、厚み１〜５μｍの
リン片状のもので、フッ素化ポリマーに対して５〜10重
量％で使用する。The graphite particles are, for example, flaky particles having a diameter of 2 to 10 μm and a thickness of 1 to 5 μm, and are used in an amount of 5 to 10% by weight based on the fluorinated polymer.
フッ素化ポリマーとしては、使用温度によって選択でき
るが、耐薬品性の良い四ふっ化エチレン−パーフルオロ
アルキルビニールエーテル共重合樹脂(PFA) 、エチレン
−四ふっ化エチレン共重合体(ETFE)、四ふっ化エチレン
−六ふっ化プロピレン共重合体(FEP)、ポリ四ふっ化エ
チレン(PTFE)などが適している。被膜の形成方法として
は、静電塗装法、溶融押出し法、熱収縮性チューブ法な
どがある。The fluorinated polymer can be selected depending on the operating temperature, but it has good chemical resistance, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), tetrafluoride. Suitable are ethylene fluoride-propylene hexafluoride copolymer (FEP) and polytetrafluoroethylene (PTFE). Examples of the method for forming the coating include an electrostatic coating method, a melt extrusion method, and a heat shrinkable tube method.
次にその製造法について述べる。Next, the manufacturing method will be described.
静電塗装法では、まず冷却パイプ(5)の表面の付着物を4
00 ℃前後で空焼きし、脱脂する。物理的結合を良くす
るために砂などでショットブラストし、下地処理をした
後、プライマーを塗装し焼成する。そして、黒鉛質粒子
とフッ素化ポリマーの混合体を塗装し、焼成する。焼成
温度はフッ素化ポリマーの軟化点以上とする。規定の膜
厚になるまで、塗装・焼成を繰返し、膜厚およびピンホ
ールを有無の検査する。In the electrostatic coating method, first remove the deposits on the surface of the cooling pipe (5).
Bake at about 00 ℃ and degrease. In order to improve the physical bond, shot blasting with sand or the like is performed, and after the surface treatment, a primer is applied and baked. Then, a mixture of graphite particles and a fluorinated polymer is applied and fired. The firing temperature is higher than the softening point of the fluorinated polymer. Coating and firing are repeated until the specified film thickness is reached, and the film thickness and pinholes are inspected.
溶融押出し法では、下地処理までは上記静電塗装と同じ
であるが、被膜の形成は予め作られた黒鉛質粒子とフッ
素化ポリマーのチューブの中に、直線状の冷却パイプ
(5)を押し込み、加熱・加圧しながら冷却パイプ(5)に被
覆していく方法である。The melt extrusion method is the same as the above electrostatic coating until the base treatment, but the formation of the coating is performed by using a straight cooling pipe in a tube of graphitized particles and fluorinated polymer made in advance.
This is a method in which (5) is pushed in and the cooling pipe (5) is covered while heating and pressurizing.
熱収縮性チューブ法は、直線状の冷却パイプ(5)に黒鉛
質粒子とフッ素化ポリマーで作られた熱収縮性チューブ
を被覆し、フッ素化ポリマーの軟化点以上の温度で加熱
収縮させて被覆する方法である。冷却パイプ(5)が曲線
状のものを被覆する時は、静電塗装法が適している。In the heat-shrinkable tube method, a straight cooling pipe (5) is coated with a heat-shrinkable tube made of graphite particles and a fluorinated polymer, and heat-shrinked at a temperature equal to or higher than the softening point of the fluorinated polymer. Is the way to do it. When coating the cooling pipe (5) with a curved shape, the electrostatic coating method is suitable.
ここで、直径２〜１０μｍ、厚み１〜５μｍのリン片状
の黒鉛質粒子をフッ素化ポリマーに対して５〜１０重量
％添加した混合体を冷却パイプ（５）の外面に塗装し焼
成した本願発明と、フッ素化ポリマーのみを冷却パイプ
（５）の外面に被覆した比較例とを作製したところ、本
願発明による冷却パイプ（５）の熱伝導率は比較例のも
のに対して、２〜３倍の向上があった。つぎに、第３図
の（ｂ）に示すように、冷却板（１）の間にガス分離板
（１０）を介して６個の単位セル（１１）を積層した燃
料電池を、本願発明および比較例の冷却パイプをそれぞ
れ用いて２種類作製し、電流密度２００ｍＡ／ｃｍ2、
セル電圧６６０ｍＶ、冷却水温度１７０℃として動作さ
せ、両側に配置された冷却板（１）に対する燃料電池の
両端部および中央部の温度差を測定し、その結果を第３
図の（ａ）に示す。第３図の（ａ）から明らかなよう
に、本願配置の冷却板による冷却性能が優れていること
がわかる。Here, a mixture obtained by adding 5 to 10% by weight of scaly graphite particles having a diameter of 2 to 10 μm and a thickness of 1 to 5 μm to the fluorinated polymer was applied to the outer surface of the cooling pipe (5) and baked. When the invention and a comparative example in which only the fluorinated polymer was coated on the outer surface of the cooling pipe (5), the thermal conductivity of the cooling pipe (5) according to the present invention was 2 to 3 relative to that of the comparative example. There was a double improvement. Next, as shown in FIG. 3 (b), a fuel cell in which six unit cells (11) are stacked between a cooling plate (1) and a gas separation plate (10) is used. Two types were prepared using the cooling pipes of the comparative examples, and the current density was 200 mA / cm 2 ,
It was operated at a cell voltage of 660 mV and a cooling water temperature of 170 ° C., and the temperature difference between both ends and the central part of the fuel cell with respect to the cooling plates (1) arranged on both sides was measured.
It is shown in FIG. As is clear from FIG. 3 (a), it can be seen that the cooling plate provided in this application has excellent cooling performance.
尚、上記実施例は黒鉛質粒子が直径２〜10μｍ；厚み１
〜５μｍのリン片状でフッ素化ポリマーに対して５〜10
重量％で使用する場合について述べたが、これら数値に
限定されるものではない。In the above example, the graphite particles have a diameter of 2 to 10 μm; a thickness of 1
~ 5μm scaly, 5-10 for fluorinated polymer
Although the case of using it by weight% is described, it is not limited to these numerical values.
以上のように、この発明によれば、冷却パイプの被膜を
黒鉛質粒子とフッ素化ポリマーで形成することによっ
て、冷却パイプを電解質から保護して腐食を防止し、か
つ従来のものに対して熱伝導率を著しく向上することが
でき、高性能な燃料電池用冷却装置が得られる効果があ
る。As described above, according to the present invention, by forming the coating of the cooling pipe from the graphite particles and the fluorinated polymer, the cooling pipe is protected from the electrolyte to prevent corrosion, and the cooling pipe is protected against heat. The conductivity can be remarkably improved, and a high-performance cooling device for a fuel cell can be obtained.
第１図はこの発明の一実施例による燃料電池用冷却装置
の要部を示す断面図、第２図は従来の燃料電池用冷却装
置を示す断面図、第３図はこの発明の燃料電池用冷却装
置の冷却性能を説明する図である。 図において、（１）、（３）は冷却板、(5)は冷却パイ
プ、(6)は冷却パイプ溝、(9)は被膜である。 なお、図中同一符号は、同一又は相当部分を示す。FIG. 1 is a sectional view showing an essential part of a fuel cell cooling apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view showing a conventional fuel cell cooling apparatus, and FIG. 3 is a fuel cell according to the present invention. It is a figure explaining the cooling performance of a cooling device. In the figure, (1) and (3) are cooling plates, (5) is a cooling pipe, (6) is a cooling pipe groove, and (9) is a coating. The same reference numerals in the drawings indicate the same or corresponding parts.
Claims (5)
介して埋設され上記冷却板との間で、熱交換を行う冷却
パイプとを有する燃料電池用冷却装置において、前記冷
却パイプの外面は、黒鉛質粒子とフッ素化ポリマーの混
合体の被膜によって被覆されていることを特徴とする燃
料電池用冷却装置。1. A cooling device for a fuel cell, comprising: a cooling plate; and a cooling pipe embedded in a groove of the cooling plate via a filling material for exchanging heat between the cooling plate and the cooling pipe. A cooling device for a fuel cell, wherein an outer surface of the pipe is covered with a film of a mixture of graphite particles and a fluorinated polymer.
ｍのりん片状の黒鉛質粒子が５〜１０重量％含まれてい
ることを特徴とする特許請求の範囲第１項記載の燃料電
池用冷却装置。2. The coating has a diameter of 2 to 10 μm and a thickness of 1 to 5 μm.
5. The cooling device for a fuel cell according to claim 1, characterized in that the flaky graphite particles of m are contained in an amount of 5 to 10% by weight.
ーフルオロアルキルビニールエーテル共重合樹脂、エチ
レン−四ふっ化エチレン共重合体、四ふっ化エチレン−
六ふっ化プロピレン共重合体、ポリ四ふっ化エチレンの
うちの一つであることを特徴とする特許請求の範囲第１
項又は第２項記載の燃料電池用冷却装置。3. The fluorinated polymer is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin, ethylene-tetrafluoroethylene copolymer, or tetrafluoroethylene-
Claim 1 characterized in that it is one of a propylene hexafluoride copolymer and polytetrafluoroethylene.
Item 2. A cooling device for a fuel cell according to item 2.
混合された粉体を静電塗装した後、フッ素化ポリマーの
軟化点以上の温度で熱処理されたものであることを特徴
とする特許請求の範囲第１項ないし、第３項の何れかに
記載の燃料電池用冷却装置。4. The coating film is obtained by electrostatically coating powder containing a mixture of graphite particles and a fluorinated polymer and then heat-treating at a temperature equal to or higher than the softening point of the fluorinated polymer. The cooling device for a fuel cell according to any one of claims 1 to 3.
混合体で形成された熱収縮性フッ素樹脂チューブあるい
は溶融押出し法によって形成された被膜であることを特
徴とする特許請求の範囲第１項ないし、第３項の何れか
に記載の燃料電池用冷却装置。5. A heat-shrinkable fluororesin tube formed of a mixture of graphite particles and a fluorinated polymer, or a film formed by a melt extrusion method. Item 5. A cooling device for a fuel cell according to any one of items 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61168724A JPH0638339B2 (en) | 1986-07-16 | 1986-07-16 | Cooling device for fuel cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61168724A JPH0638339B2 (en) | 1986-07-16 | 1986-07-16 | Cooling device for fuel cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6324562A JPS6324562A (en) | 1988-02-01 |
| JPH0638339B2 true JPH0638339B2 (en) | 1994-05-18 |
Family
ID=15873252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61168724A Expired - Lifetime JPH0638339B2 (en) | 1986-07-16 | 1986-07-16 | Cooling device for fuel cells |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638339B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07105239B2 (en) * | 1988-05-06 | 1995-11-13 | 富士電機株式会社 | Fuel cell cooling body |
| JPH056690U (en) * | 1991-07-12 | 1993-01-29 | 中興化成工業株式会社 | Insulation hose for fuel cell |
| EP0683536B1 (en) * | 1994-05-20 | 2000-01-19 | International Fuel Cells Corporation | Coolant plate assembly for a fuel cell stack |
| JP6709945B1 (en) * | 2019-02-04 | 2020-06-17 | 日本フッソ工業株式会社 | Film body containing high-purity graphene and method for producing the film body |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0610986B2 (en) * | 1984-07-11 | 1994-02-09 | 株式会社日立製作所 | Fuel cell cooler |
-
1986
- 1986-07-16 JP JP61168724A patent/JPH0638339B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6324562A (en) | 1988-02-01 |
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