JPH03163759A - Fuel cell - Google Patents
Fuel cellInfo
- Publication number
- JPH03163759A JPH03163759A JP1299683A JP29968389A JPH03163759A JP H03163759 A JPH03163759 A JP H03163759A JP 1299683 A JP1299683 A JP 1299683A JP 29968389 A JP29968389 A JP 29968389A JP H03163759 A JPH03163759 A JP H03163759A
- Authority
- JP
- Japan
- Prior art keywords
- manifold
- insulator
- cell stack
- fuel cell
- fluororesin
- 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
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 13
- 239000012212 insulator Substances 0.000 claims abstract description 29
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims 2
- 238000007789 sealing Methods 0.000 abstract description 8
- 238000009413 insulation Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035936 sexual power Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
- H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
- H01M8/2485—Arrangements for sealing external manifolds; Arrangements for mounting external manifolds around a stack
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、セルスタックとその外周面に配置されたマ
ニホールドとの間の絶縁構戒を改良した燃料電池に関す
るものである．
（ Ｐ６ ｍ ｅｓ ｍ ｍ ）
第５図は例えば特開昭６３−２０５０６０号公報に示さ
れた従来の燃料電池のシール部を示す平断面図であり、
図において、〈１〉は図示しない素電池とセパレート板
とを組合せた１個の単位電池を複数個積層し、上下に集
電板を配置して角柱状に構戒されてなるセルスタック、
（２）はセルスタック（１）の外周面に各々取付けられ
反応ガスを供給および排出するための金属製マニホール
ド、（３）は断面四角形状のマニホールド（２）の端部
に形成された取付縁部、（４）はシールパッキン（５〉
および〈６〉の間に介在したシール溝付フッ素樹脂板で
ある．従来の燃料電池のシール部は上記のように構成さ
れ、反応ガス供給用のマニホールド《２）から燃料ガス
および酸化剤ガスがセルスタック（１〉に供給され、セ
ルスタック（１）は電気化学的反応を起し発電する．反
応に寄与しなかったガスや反応で生成されたガスはセル
スタック（１）から排出用マニホールド（２）へ排出さ
れる．この時、セルスタック（１）には発電により電圧
が印加されるが、フーｌ査崩讃肋ＩＡ）Ｌ噌トｈフ−七
−ｓＬＫ（９１ レふ＋Ｌフタック（１〉との間は電
気的絶縁が行われており、またフッ素樹脂板（４）はリ
ン酸に対して防蝕性を保持し、シールパッキン（５〉お
よび（６）はマニホールド（２）内のガス気密性を保持
している．また、セルスタック（１）とマニホールド（
２）との熱膨張の差異によりシールパッキン（５）およ
び（６）はフッ素樹脂板（４）の面で摺動するように構
戒され、セルスタック（１）やマニホールド（２）に過
大な熱応力が発生しないようになっている．
〔発明が解決しようとする課題〕
上記のような従来の燃料電池では、シールパッキン（５
），（８）をフッ素樹脂板４の両面に設けてあり、ガス
機密性の信頼性が低いという問題点が鳥・た．
また、金属製マニホールド（２〉とフッ素樹脂板（４）
との熱膨張の差異により、フッ素樹脂板〈４）をその熱
膨張差異分だけ取付縁部（３〉より大きくする必要があ
り、この結果、シール幅を大きくしなければならず、セ
ルスタック（１）のセパレータ板（図示せず）に設けら
れたガス流路溝の領域が制約される問題点もあった．
さらに、マニホールド（２）をセルスタック（１〉に組
み立てる際に、フッ素樹脂板（４）が独立しているため
にすり落ちないように支えなければならず、組立作業上
手間になるという問題点もあった．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、セルス
タックとマニホールドとの絶縁信頼性およびガス機密性
が向上し、またセパレート板のガス流路渭の領域が広く
、また組み立て作業の容易な燃料電池を提供することを
目的とする．
〔課題を解決するための手段〕
この発明に係る燃料電池のシール部は、マ二ホールドの
周縁部に加熱融着されているとともにシート状のフッ素
樹脂からなる絶縁体と、この絶縁体と前記セルスタック
との間に介在された柔軟性のシールパッキンとからなっ
ているものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel cell in which the insulation structure between a cell stack and a manifold arranged on its outer peripheral surface is improved. (P6 m es m m) FIG. 5 is a plan cross-sectional view showing a seal portion of a conventional fuel cell disclosed in, for example, Japanese Patent Laid-Open No. 63-205060,
In the figure, <1> is a cell stack formed by stacking a plurality of unit batteries, each of which is a combination of a unit cell (not shown) and a separate plate, arranged in a prismatic shape with current collecting plates arranged above and below;
(2) is a metal manifold attached to the outer peripheral surface of the cell stack (1) for supplying and discharging reaction gas, and (3) is a mounting edge formed at the end of the manifold (2), which has a square cross section. Part (4) is the seal packing (5>
and <6> is a fluororesin plate with a seal groove. The seal section of a conventional fuel cell is configured as described above, and fuel gas and oxidant gas are supplied to the cell stack (1) from the reaction gas supply manifold (2), and the cell stack (1) is electrochemically A reaction occurs to generate electricity. Gases that did not contribute to the reaction and gases generated by the reaction are discharged from the cell stack (1) to the exhaust manifold (2). At this time, the cell stack (1) generates electricity. However, electrical insulation is provided between the voltage and the fluorine resin. The plate (4) maintains corrosion resistance against phosphoric acid, and the seal packings (5> and (6) maintain gas tightness within the manifold (2). Also, the cell stack (1) and the manifold (
Due to the difference in thermal expansion from This prevents thermal stress from occurring. [Problem to be solved by the invention] In the conventional fuel cell as described above, the seal packing (5
), (8) are provided on both sides of the fluororesin plate 4, which poses the problem of low reliability of gas tightness. In addition, metal manifold (2) and fluororesin plate (4)
Due to the difference in thermal expansion between the fluororesin plate (4) and the mounting edge (3), it is necessary to make the fluororesin plate (4) larger than the mounting edge (3) by the difference in thermal expansion.As a result, the seal width must be increased, and the cell stack ( There was also the problem that the area of the gas flow groove provided in the separator plate (not shown) in 1) was restricted.Furthermore, when assembling the manifold (2) to the cell stack (1>), the fluororesin plate Since (4) is independent, it has to be supported to prevent it from falling off, which makes assembly work difficult.This invention was made to solve the above problems. The purpose of the present invention is to provide a fuel cell that has improved insulation reliability and gas tightness between the cell stack and manifold, has a wide area for the gas flow path of the separate plate, and is easy to assemble. [Means for Solving the Problems] The seal portion of the fuel cell according to the present invention includes an insulator made of a sheet-like fluororesin, which is heat-fused to the peripheral edge of the manifold, and this insulator. and a flexible seal packing interposed between the cell stack and the cell stack.
この発明においては、マニホールドの周縁部にフッ素樹
脂からなる絶縁体を加熱融着したので、マニホールドと
セルスタックとの間の絶縁性およびガス機密性が向上し
、また絶縁体の熟膨張はマニホールドの熱膨張に支配さ
れ絶縁体とマニホールドとの間には伸び、縮むの差異が
なくなる．〔実施例〕
以下、この発明の実施例を図について説明する．第１図
はこの発明の一実施例を示す要部の断面図であり、第５
図と同一または相当部分は同一符号を付し、その説明は
省略する．
図において、（７）は周縁部がＬの字状に折曲されたマ
ニホールド（２）に加熱融着されたフッ素樹脂からなる
絶縁体である．
第２図は絶縁体《７）がマニホールド（２）に加熱融着
される方法を示す図であり、マ二ホールド（２）に融着
促進剤（８）を塗布後、そのマニホールド（２〉に厚さ
０．５〜４．０’，，の絶縁体（７）を重ね合わせ、次
に治具（９）を用いてマニホールド（２）と絶縁体（７
）とを密着させる．そして、ヒータ（１０）によりマニ
ホールド（２） ｆｉｌから約３００ 〜４００’Ｃ４
，：絶縁体（７） ヲ加熱完全に融着される．
以上の燃料電池のシール部においては、マニホールド（
２）の周縁部に絶縁体（７）を加熱融着したので、マニ
ホールド（２）と絶縁体（７〉とは完全に密着され、従
来この間に介在したシールパッキン（６〉は不必要とな
り、またガス機密性および絶縁性が向上する．
また、セルスタック（１）にマニホールド（２〉を組み
立てる際に絶縁体（７）はマニホールド（２）に固定さ
れているために、組立作業性が向上する。In this invention, an insulator made of fluororesin is heat-fused to the periphery of the manifold, which improves the insulation and gas tightness between the manifold and the cell stack, and prevents the premature expansion of the insulator. Governed by thermal expansion, there is no difference in expansion and contraction between the insulator and the manifold. [Example] Hereinafter, an example of the present invention will be explained with reference to the drawings. FIG. 1 is a sectional view of main parts showing one embodiment of the present invention, and FIG.
Parts that are the same as or corresponding to those in the figure are given the same reference numerals, and their explanation will be omitted. In the figure, (7) is an insulator made of fluororesin that is heat-sealed to a manifold (2) whose peripheral edge is bent into an L-shape. Figure 2 is a diagram showing a method for heat-sealing the insulator (7) to the manifold (2). After applying the fusing promoter (8) to the manifold (2), the manifold (2) The insulator (7) with a thickness of 0.5 to 4.0' is superimposed on the manifold (2) and the insulator (7) using the jig (9).
) and bring them into close contact. Then, the heater (10) heats the manifold (2) to approximately 300 to 400'C4.
, : Insulator (7) is completely fused by heating. In the seal part of the above fuel cell, the manifold (
Since the insulator (7) is heat-fused to the peripheral edge of the manifold (2), the insulator (7) is completely attached to the manifold (2), and the seal packing (6) that was conventionally interposed between them is no longer necessary. Gas tightness and insulation properties are also improved. Also, when assembling the manifold (2) to the cell stack (1), the insulator (7) is fixed to the manifold (2), improving assembly work efficiency. do.
さらに、絶縁体（７）はマニホールド（２）に固定され
、絶縁体《７）の熱膨張はマニホールド（２〉に支配さ
れ、マニホールド《２〉のシール幅を減少することがで
き、セパレート板に設けられたガス流路溝の領域を広く
とることが可能となる．
さらにまた、厚さ０．５〜４ ． Ｏ Ｊ，，程度の薄
肉のフッ素樹脂板を用いたので、フッ素樹脂特有のクリ
ープを微小なものとし、シール面圧低下によるマニホー
ルド（２）内のガス機密性の低下を防ぐことが４ａ ｍ
？
なお、上記実施例ではマニホールド（２〉の取付縁部（
３〉を曲げ加工した例を示したが、これは第３図に示し
たように従来と同様の形でもよい．また、マニホールド
（２）の周縁部を第４Ａ図、第４Ｂ図に示すように曲げ
加工した形状のものでもよい。さらに、マニホールド（
２）に絶縁体（７〉を加熱融着する方法として、上記実
施例のヒータ（１０）以外に例えば炉、温風加熱、高周
波加熱等を用いてもよい。さらに、マニホールド（２〉
にフッ素樹脂を加熱融着した場合について説明したが、
これに限ることなく、マニホールド（２）の縁部あるい
は全面にフッ素樹脂を約０．１〜２．０ｍｍ程度の厚さ
になるように吹き付けてコーティングしてもよい。Furthermore, the insulator (7) is fixed to the manifold (2), and the thermal expansion of the insulator (7) is controlled by the manifold (2), which can reduce the sealing width of the manifold (2) and allow the separation plate to It becomes possible to widen the area of the provided gas flow groove.Furthermore, since a thin fluororesin plate with a thickness of 0.5 to 4.0 J, is used, creep peculiar to fluororesin is avoided. It is important to minimize the gas leakage and prevent the gas tightness inside the manifold (2) from decreasing due to a decrease in seal surface pressure.
? In addition, in the above embodiment, the mounting edge (2) of the manifold (2)
3〉 was shown as an example of bending, but this may be in the same shape as the conventional one as shown in Fig. 3. Alternatively, the peripheral edge of the manifold (2) may be bent as shown in FIGS. 4A and 4B. In addition, the manifold (
In addition to the heater (10) in the above embodiment, a furnace, hot air heating, high-frequency heating, etc. may be used as a method for heat-sealing the insulator (7) to the manifold (2).
We explained the case where fluororesin was heat-fused, but
The invention is not limited to this, but the edge or the entire surface of the manifold (2) may be coated by spraying the fluororesin to a thickness of about 0.1 to 2.0 mm.
以上説明したように、この発明の燃料電池によれば、マ
ニホールドの周縁部にフッ素樹脂からなる絶縁体を加熱
融着したので、マニホールドとセルスタックとの間の絶
縁性、ガス機密性および組み立て作業性が向上するとい
う効果がある．また、絶縁体の熱膨張はマニホールドの
熱膨張に支配され絶縁体とマニホールドとの間には伸び
、縮むの差異がなくなるので、マニホールドのシール幅
が減少し、セパレー夕のガス流路領域を広くすることが
できる結果、電極有効面積も大きくでき、これにより単
位電池の数を低減し、セルスタックのコンパクト化、コ
ストの低減化が可能になるという効果もある．As explained above, according to the fuel cell of the present invention, an insulator made of fluororesin is heat-fused to the periphery of the manifold, which improves the insulation between the manifold and the cell stack, improves gas tightness, and improves assembly work. It has the effect of improving sexual performance. In addition, the thermal expansion of the insulator is controlled by the thermal expansion of the manifold, and there is no difference in expansion and contraction between the insulator and the manifold, so the seal width of the manifold is reduced and the gas flow area of the separator is widened. As a result, the effective area of the electrode can be increased, which has the effect of reducing the number of unit cells, making it possible to make the cell stack more compact and reduce costs.
第１図はこの発明の一実施例によるシール部の平断面図
、第２図は第１図のシール部の製造途中を示す断面図、
第３図はこの発明の他の実施例を示すシール部の平断面
図、第４Ａ図および第４Ｂ図は絶縁体の他の実施形態を
示す断面図、第５図は従来の燃料電池のシール部の一例
を示す平断面図である．
（１）はセルスタック、（２）はマニホールド、（３）
はマニホールドの取ｔ−ｔ縁部、（５）および（６）は
シールパッキン、（７）は絶縁体である．なお、各図中
、同一符号は同一又は相当部分を示す．FIG. 1 is a plan sectional view of a seal portion according to an embodiment of the present invention, FIG. 2 is a sectional view showing the seal portion of FIG. 1 in the middle of manufacturing,
FIG. 3 is a plan sectional view of a seal portion showing another embodiment of the present invention, FIGS. 4A and 4B are sectional views showing other embodiments of the insulator, and FIG. 5 is a conventional fuel cell seal. FIG. (1) is cell stack, (2) is manifold, (3)
is the t-t edge of the manifold, (5) and (6) are the seal packings, and (7) is the insulator. In each figure, the same reference numerals indicate the same or equivalent parts.
Claims (1)
排出用のマニホールドをそれぞれ配置するに際し、前記
セルスタックの外周面と前記マニホールドの周縁部との
間にシール部を介在してなる燃料電池において、前記シ
ール部は、前記マニホールドの周縁部に加熱融着されて
いるとともにシート状のフッ素樹脂からなる絶縁体と、
この絶縁体と前記セルスタックとの間に介在された柔軟
性のシールパッキンとからなっていることを特徴とする
燃料電池。In a fuel cell in which a seal portion is interposed between the outer circumferential surface of the cell stack and the peripheral edge of the manifold when manifolds for supplying reactant gas and for discharging reactant gas are respectively disposed on the outer circumferential surface of the cell stack, The seal portion includes an insulator made of a sheet-like fluororesin that is heat-sealed to the peripheral edge of the manifold;
A fuel cell comprising a flexible seal packing interposed between the insulator and the cell stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1299683A JPH03163759A (en) | 1989-11-20 | 1989-11-20 | Fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1299683A JPH03163759A (en) | 1989-11-20 | 1989-11-20 | Fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03163759A true JPH03163759A (en) | 1991-07-15 |
Family
ID=17875704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1299683A Pending JPH03163759A (en) | 1989-11-20 | 1989-11-20 | Fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03163759A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6059670A (en) * | 1983-09-12 | 1985-04-06 | Hitachi Ltd | Fuel cell |
-
1989
- 1989-11-20 JP JP1299683A patent/JPH03163759A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6059670A (en) * | 1983-09-12 | 1985-04-06 | Hitachi Ltd | Fuel cell |
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