JP6317553B2 - Fuel cell - Google Patents

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JP6317553B2
JP6317553B2 JP2013178954A JP2013178954A JP6317553B2 JP 6317553 B2 JP6317553 B2 JP 6317553B2 JP 2013178954 A JP2013178954 A JP 2013178954A JP 2013178954 A JP2013178954 A JP 2013178954A JP 6317553 B2 JP6317553 B2 JP 6317553B2
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fuel cell
power transmission
heat
transmission cable
cable
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JP2015049958A (en
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哲也 森川
哲也 森川
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NGK Spark Plug Co Ltd
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    • 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
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Description

本発明は、高温で発電を行う発電ユニットを断熱容器で囲った燃料電池に関する。   The present invention relates to a fuel cell in which a power generation unit that generates power at a high temperature is surrounded by a heat insulating container.

燃料電池は、発電の最小単位である燃料電池セルを複数枚積層して発電ユニット（「燃料電池スタック」ともいう。）としている。
一方、現在、燃料電池には、電解質の材質により大別して、高分子電解質膜を電解質とする固体高分子形燃料電池（ＰＥＦＣ）と、リン酸を電解質とするリン酸形燃料電池（ＰＡＦＣ）と、Ｌｉ−Ｎａ／Ｋ系炭酸塩を電解質とする溶融炭酸塩形燃料電池（ＭＣＦＣ）と、例えばＺｒＯ２系セラミックを電解質とする固体酸化物形燃料電池（ＳＯＦＣ）の４タイプがある。各タイプは、作動温度（イオンが電解質中を移動できる温度）が異なるのであって、現時点において、ＰＥＦＣは常温〜約９０℃、ＰＡＦＣは約１５０℃〜２００℃、ＭＣＦＣは約６００℃〜７００℃、ＳＯＦＣは約７００℃〜１０００℃である。 A fuel cell is a power generation unit (also referred to as a “fuel cell stack”) in which a plurality of fuel cells, which are the minimum unit of power generation, are stacked.
On the other hand, fuel cells are roughly classified according to the material of the electrolyte, and a solid polymer fuel cell (PEFC) using a polymer electrolyte membrane as an electrolyte and a phosphoric acid fuel cell (PAFC) using phosphoric acid as an electrolyte. There are four types: a molten carbonate fuel cell (MCFC) using Li-Na / K carbonate as an electrolyte and a solid oxide fuel cell (SOFC) using a ZrO 2 ceramic as an electrolyte. Each type has a different operating temperature (the temperature at which ions can move through the electrolyte). At present, PEFC is at room temperature to about 90 ° C, PAFC is about 150 ° C to 200 ° C, and MCFC is about 600 ° C to 700 ° C. , SOFC is about 700 ° C to 1000 ° C.

これらの燃料電池のうち、ＭＣＦＣやＳＯＦＣなど高温で作動させるものは、その作動温度を維持するために前記発電ユニットを囲う断熱容器を備えている（特許文献１参照）。
また、これらの燃料電池は、発電ユニットで発電した電気を断熱容器の外に取り出すために、発電ユニットに接続された導電性の電流取り出し部材と、その電流取り出し部材に断熱容器の外で接続される導電性の端子金具と、その端子金具に接続される例えば樹脂製の絶縁被覆材の中に銅線を通した送電ケーブルと、を有する。 Among these fuel cells, those that operate at high temperatures, such as MCFC and SOFC, include a heat insulating container that surrounds the power generation unit in order to maintain the operating temperature (see Patent Document 1).
In addition, these fuel cells are connected to the electric current extraction member connected to the power generation unit and the electric current extraction member outside the heat insulation container in order to take out the electricity generated by the power generation unit out of the heat insulation container. And a power transmission cable in which a copper wire is passed through an insulating covering material made of, for example, resin connected to the terminal fitting.

さて、従来の端子金具には、羽子板の板の部分に相当する板状の接続部と、羽子板の柄の部分に相当するものであって接続部側が閉じたキャップ形状で送電ケーブルの導電部（前記絶縁被覆材の先に突出させた銅線）に被さるケーブル接合部と、を有するほぼ羽子板形状のものがある。
そして、このような端子金具には、ケーブル接合部を加締めるなどして送電ケーブルの導電部との密閉性が確保されるようにしたものがある。もし、送電ケーブルの導電部が高温の酸化ガスに触れると、その部分が酸化して端子金具と送電ケーブルとの接触部分の電気抵抗が上昇するおそれがあるためである。 In the conventional terminal fitting, there are a plate-like connection portion corresponding to the plate portion of the battledore and a conductive portion of the transmission cable in a cap shape corresponding to the handle portion of the battledore plate and closed on the connection portion side ( And a cable joint covering a copper wire protruding from the tip of the insulating coating material.
Such terminal fittings include those in which sealing with the conductive portion of the power transmission cable is ensured by, for example, caulking the cable joint. This is because, if the conductive portion of the power transmission cable is exposed to high-temperature oxidizing gas, the portion is oxidized, and the electrical resistance of the contact portion between the terminal fitting and the power transmission cable may increase.

特開平１−２８３７７２号公報（第２頁左上欄）Japanese Laid-Open Patent Publication No. 1-283772 (upper left column on page 2)

ところが実際には、端子金具のケーブル接合部を加締めて送電ケーブルの導電部との密閉性が確保されているにも拘わらず、電流取り出し部材から送電ケーブルに至る送電経路の電気抵抗が経時的に上昇する場合があった。   In practice, however, the electrical resistance of the power transmission path from the current extraction member to the power transmission cable is changed over time, despite the fact that the cable joint of the terminal fitting is crimped to ensure sealing with the conductive part of the power transmission cable. There was a case of rising.

そこで、送電経路の電気抵抗が上昇する部位の特定と原因について検討した結果、次のような結論に到達した。
すなわち、発電ユニットで発電した電気を断熱容器の外に取り出すための電流取り出し部材や端子金具さらには送電ケーブルの導電部などは、効率良く電気を取り出すために電気伝導性に優れた材料が使われているが、そのような電気伝導性の高い材料は同時に高い熱伝導性を有する。
したがって、発電ユニットの発電時の高熱が、電流取り出し部材から端子金具を経て送電ケーブルにまで到達する。そうすると、その高熱で端子金具のケーブル接合部と送電ケーブルの導電部が熱膨張して両者の間の密閉性が高温環境下で低下する。これにより送電ケーブルの導電部が高温の酸化ガスに触れて酸化したり、或は発電ユニットから漏れ出ることがある微小な漏洩ガスに触れて腐食するため、端子金具と送電ケーブルの接触部分の電気抵抗が上昇する。 Therefore, as a result of examining the location and the cause of the increase in the electrical resistance of the power transmission path, the following conclusion was reached.
In other words, materials with excellent electrical conductivity are used for the current extraction members, terminal fittings, and conductive parts of power transmission cables to extract the electricity generated by the power generation unit out of the heat insulation container. However, such a highly conductive material has a high thermal conductivity at the same time.
Therefore, high heat generated during power generation by the power generation unit reaches the power transmission cable from the current extraction member via the terminal fitting. If it does so, the cable junction part of a terminal metal fitting and the electroconductive part of a power transmission cable will thermally expand with the high heat, and the sealing performance between both will fall in a high temperature environment. This causes the conductive part of the transmission cable to oxidize by contact with the high-temperature oxidizing gas or to corrode by contact with minute leakage gas that may leak from the power generation unit. Resistance rises.

本発明は、上記に鑑みなされたもので、その目的は、発電ユニットから電流を取り出す送電経路の経時的な電気抵抗の上昇が抑制可能な燃料電池を提供することにある。   The present invention has been made in view of the above, and an object of the present invention is to provide a fuel cell capable of suppressing an increase in electrical resistance over time of a power transmission path for extracting a current from a power generation unit.

上記の目的を達成するため本発明は、請求項１に記載したように、
高温で発電を行う発電ユニットと、
その発電ユニットを囲う断熱容器と、
前記発電ユニットで発電した電気を前記断熱容器の外に取り出す導電性の電流取り出し部材と、
前記断熱容器の外で導電性の端子金具を介して前記電流取り出し部材に接続される送電ケーブルと、を備える燃料電池において、
前記端子金具は、
前記送電ケーブルの導電部にキャップ状に被さり封止状態で該送電ケーブルに固着されるケーブル接合部と、
前記電流取り出し部材に連結される接続部と、を有し、
前記端子金具の前記ケーブル接合部と前記接続部との間に放熱部を設けてなる燃料電池を提供する。 In order to achieve the above object, the present invention as described in claim 1,
A power generation unit that generates power at a high temperature;
An insulated container surrounding the power generation unit,
A conductive current extraction member for extracting electricity generated by the power generation unit to the outside of the heat insulation container;
In a fuel cell comprising: a power transmission cable connected to the current extraction member via a conductive terminal fitting outside the heat insulating container;
The terminal fitting is
A cable joint that covers the conductive portion of the power transmission cable in a cap shape and is fixed to the power transmission cable in a sealed state;
A connection portion coupled to the current extraction member,
Provided is a fuel cell in which a heat radiating portion is provided between the cable joint portion and the connection portion of the terminal fitting.

また、請求項２に記載したように前記放熱部は、放熱性を高めるために加工された放熱促進部を有する請求項１に記載の燃料電池を提供する。
また、請求項３に記載したように前記放熱促進部は、貫通穴で形成されている請求項２に記載の燃料電池を提供する。
また、請求項４に記載したように前記放熱促進部は、波形の変形で形成されている請求項２に記載の燃料電池を提供する。
また、請求項５に記載したように前記放熱促進部は、表面をディンプル状に窪ませて形成されている請求項２に記載の燃料電池を提供する。
また、請求項６に記載したように、前記断熱容器と前記送電ケーブルとを一つのケーシングに納めると共に該ケーシング内に空冷用の循環ファンを設置し、その循環ファンの風が直接当たる位置に前記放熱部を配置するようにした請求項１〜５の何れか１項に記載の燃料電池を提供する。
また、請求項７に記載したように前記ケーブル接合部は、前記送電ケーブルの前記導電部と密閉状態で固着されている請求項１〜６の何れか１項に記載の燃料電池を提供する。 Moreover, as described in claim 2, the heat dissipation portion provides the fuel cell according to claim 1, which includes a heat dissipation promotion portion processed to improve heat dissipation.
Moreover, as described in claim 3, the heat dissipation promoting portion is provided with a fuel cell according to claim 2, which is formed by a through hole.
Further, as described in claim 4, the heat dissipation promoting portion is provided with a fuel cell according to claim 2, which is formed by corrugated deformation.
In addition, as described in claim 5, the heat radiation promoting portion is provided with a fuel cell according to claim 2, wherein the surface is formed in a dimple shape.
In addition, as described in claim 6, the heat insulating container and the power transmission cable are housed in one casing, and a circulation fan for air cooling is installed in the casing, and the wind of the circulation fan directly hits the position. The fuel cell according to any one of claims 1 to 5, wherein a heat dissipating part is arranged.
Moreover, as described in claim 7, the cable joint portion provides the fuel cell according to any one of claims 1 to 6, which is fixed in a sealed state with the conductive portion of the power transmission cable.

本発明の燃料電池は、端子金具のキャップ状のケーブル接合部と接続部との間に放熱部を設けたことにより、発電ユニットの発電時の高熱が適度に放熱されてケーブル接合部に伝わるため、該ケーブル接合部と送電ケーブルの導電部の熱膨張が抑制される。したがって、高温環境下でもケーブル接合部と送電ケーブルの導電部との密閉性が保たれるため、導電部が高温の酸化ガスに触れて酸化したり、発電ユニットからの微小な漏洩ガスがあってもそれによる腐食の可能性が少なくなる。よって、発電ユニットから電流を取り出す送電経路の経時的な電気抵抗の上昇が生じ難い。   In the fuel cell of the present invention, since the heat radiating portion is provided between the cap-shaped cable joint portion of the terminal fitting and the connection portion, high heat at the time of power generation of the power generation unit is appropriately radiated and transmitted to the cable joint portion. The thermal expansion of the cable joint and the conductive portion of the power transmission cable is suppressed. Therefore, the cable joint and the conductive part of the power transmission cable are kept hermetically sealed even in a high-temperature environment, so that the conductive part is exposed to high-temperature oxidizing gas to oxidize or there is a minute leak gas from the power generation unit. This reduces the possibility of corrosion. Therefore, it is difficult for the electrical resistance to increase with time in the power transmission path for extracting current from the power generation unit.

また、端子金具の放熱部は、請求項２に記載したように、放熱性を高めるために加工された放熱促進部を有するものとすることで、別途冷却フィン等を設ける場合に比べ、コンパクトにすることができる。また、放熱促進部は、請求項３に記載したように貫通穴で形成するか、請求項４に記載したように波形の変形で形成するか、請求項５に記載したようにディンプル状に窪ませて形成することができる。   Further, as described in claim 2, the heat dissipating part of the terminal metal fitting has a heat dissipating promotion part processed to improve heat dissipating property, so that it is more compact than a case where a cooling fin or the like is separately provided. can do. Further, the heat radiation promoting portion is formed by a through hole as described in claim 3, or is formed by corrugated deformation as described in claim 4, or is recessed in a dimple shape as described in claim 5. Can be formed.

また、高温の燃料電池は、断熱容器と送電ケーブルが一つのケーシングに収められていて該ケーシング内に空冷用の循環ファンが設けられているが、この循環ファンの風を請求項６に記載したように端子金具の放熱部に直接当たるようにすることで、特別な装置や部品を追加することなく、端子金具の確実な冷却が安価に行える。   Further, in the high-temperature fuel cell, the heat insulating container and the power transmission cable are housed in one casing, and a circulation fan for air cooling is provided in the casing. As described above, by directly contacting the heat radiating portion of the terminal fitting, the terminal fitting can be reliably cooled at low cost without adding a special device or component.

また、請求項７の燃料電池は、ケーブル接合部が送電ケーブルの導体部と密閉状態、つまりケーブル接合部の端面と送電ケーブルの絶縁被覆材の端面同士の間についても気密が保たれる状態で固着されているため、さらに確実に送電ケーブルの導体部とケーブル接合部の密閉が保たれる。   Further, in the fuel cell according to claim 7, the cable joint is in a sealed state with the conductor of the power transmission cable, that is, in a state in which airtightness is maintained between the end face of the cable joint and the end face of the insulation covering material of the power transmission cable. Since it is fixed, the conductor part of the power transmission cable and the cable joint part are more securely maintained.

燃料電池の発電ユニットと断熱容器の斜視図である。It is a perspective view of the electric power generation unit and heat insulation container of a fuel cell. 燃料電池セルの斜視図である。It is a perspective view of a fuel cell. 燃料電池セルの分解斜視図である。It is a disassembled perspective view of a fuel cell. （ａ）は端子金具と送電ケーブルの正面図、（ｂ）はその中央縦断面図である。(A) is a front view of a terminal metal fitting and a power transmission cable, (b) is the center longitudinal cross-sectional view. 放熱部の他の形態を示す端子金具と送電ケーブルの中央縦断面図である。It is a center longitudinal cross-sectional view of the terminal metal fitting which shows the other form of a thermal radiation part, and a power transmission cable. 放熱部の他の形態を示す端子金具と送電ケーブルの正面図である。It is a front view of the terminal metal fitting and power transmission cable which show the other form of a thermal radiation part. （ａ）は端子金具と送電ケーブルの正面図、（ｂ）はその中央縦断面図である。(A) is a front view of a terminal metal fitting and a power transmission cable, (b) is the center longitudinal cross-sectional view. 燃料電池をケーシングに収めた状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which accommodated the fuel cell in the casing.

以下に本発明の実施の形態を図面を参照しつつ説明する。
燃料電池１は、発電の最小単位である燃料電池セル２，２…を複数枚積層して発電ユニット３（「燃料電池スタック」ともいう。）を形成し、その発電ユニット３を断熱容器４で囲ったものであり、高温で発電を行う例えばＺｒＯ２系セラミックを電解質５とするＳＯＦＣである。 Embodiments of the present invention will be described below with reference to the drawings.
The fuel cell 1 forms a power generation unit 3 (also referred to as “fuel cell stack”) by laminating a plurality of fuel cell cells 2, 2..., Which is the minimum unit of power generation. For example, it is an SOFC that uses, for example, a ZrO 2 -based ceramic that generates power at a high temperature as an electrolyte 5.

［燃料電池セル］
前記燃料電池セル２は、平面視正方形の板形状であり、図３の分解斜視図に示したように、上下両面に位置する一対のインターコネクタ６，７と、上下のインターコネクタ６，７のほぼ中間に位置する電解質５と、該電解質５の前記上のインターコネクタ６の内面（下面）に対向する面に形成された空気極８と、該空気極８と上のインターコネクタ６との間に形成された空気室９と、該空気室９の内部に配置され空気極８と上のインターコネクタ６とを電気的に接続する空気極集電体１０と、前記電解質５の反対面、すなわち下のインターコネクタ７の内面（上面）に対向する面に形成された燃料極１１と、該燃料極１１と下のインターコネクタ７との間に形成された燃料室１２と、該燃料室１２の内部に配置され燃料極１１と下のインターコネクタ７とを電気的に接続する燃料極集電体１３と、を有する公知のものである。 [Fuel battery cell]
The fuel cell 2 has a square plate shape in plan view. As shown in the exploded perspective view of FIG. 3, the fuel cell 2 includes a pair of interconnectors 6, 7 positioned on both upper and lower surfaces, and upper and lower interconnectors 6, 7. Between the electrolyte 5 located substantially in the middle, the air electrode 8 formed on the surface of the electrolyte 5 facing the inner surface (lower surface) of the upper interconnector 6, and the air electrode 8 and the upper interconnector 6 An air chamber 9 formed in the air chamber 9, an air electrode current collector 10 disposed in the air chamber 9 to electrically connect the air electrode 8 and the upper interconnector 6, and the opposite surface of the electrolyte 5, that is, A fuel electrode 11 formed on a surface facing the inner surface (upper surface) of the lower interconnector 7, a fuel chamber 12 formed between the fuel electrode 11 and the lower interconnector 7, Inside the fuel electrode 11 and the lower inter A fuel electrode current collector 13 for electrically connecting the connector 7 is of the known materials having.

各燃料電池セル２には、酸化ガスたる空気が空気用のガス供給路１４から空気室９に供給され、その空気が空気室９を通って空気用のガス排出路１５から排出され、また、燃料ガスが燃料用のガス供給路１６から燃料室１２に供給され、その燃料ガスが燃料室１２を通って燃料用のガス排出路１７から排出される。   In each fuel cell 2, air as an oxidizing gas is supplied from the gas supply path 14 for air to the air chamber 9, and the air is discharged from the gas discharge path 15 for air through the air chamber 9. Fuel gas is supplied from the fuel gas supply path 16 to the fuel chamber 12, and the fuel gas is discharged from the fuel gas discharge path 17 through the fuel chamber 12.

［発電ユニット］
発電ユニット３は、前記燃料電池セル２，２…を複数枚積層したものであり、その積層体の上下を導電性のエンドプレート１８ａ，１８ｂで挟んで各コーナーに通した締付け部材１９ａ〜１９ｄたるボルトとナットで固定したものである。なお、積層状態にある燃料電池セル２，２…のインターコネクタ６，７同士が密着する部分では、一枚のインターコネクタ（６又は７）を上下の燃料電池セル２，２で共有するようになっている。また、締付け部材１９ａ〜１９ｄの上端は、前記断熱容器４の外部に突出して該断熱容器４にナット２０ａ〜２０ｄで取り付けられている。 [Power generation unit]
The power generation unit 3 is formed by laminating a plurality of the fuel cells 2, 2..., And is a fastening member 19a to 19d that is passed through each corner with the top and bottom of the laminate sandwiched between conductive end plates 18a and 18b. It is fixed with bolts and nuts. In the portion where the interconnectors 6 and 7 of the fuel cells 2 in the stacked state are in close contact with each other, the upper and lower fuel cells 2 and 2 share one interconnector (6 or 7). It has become. Further, the upper ends of the fastening members 19a to 19d protrude outside the heat insulating container 4 and are attached to the heat insulating container 4 with nuts 20a to 20d.

また、発電ユニット３には、燃料電池セル２の空気用のガス供給路１４とガス排出路１５に連通して断熱容器４の外に突き出るガス供給管２１とガス排出管２２並びに燃料用のガス供給路１６とガス排出路１７に連通して断熱容器４の外に突き出るガス供給管２３とガス排出管２４が突設されている。   Further, the power generation unit 3 includes a gas supply pipe 21 and a gas discharge pipe 22 that are communicated with the air gas supply path 14 and the gas discharge path 15 of the fuel battery cell 2 and project outside the heat insulating container 4, and fuel gas. A gas supply pipe 23 and a gas discharge pipe 24 that protrude from the heat insulating container 4 in communication with the supply path 16 and the gas discharge path 17 are provided.

［発電］
実施形態のようなＳＯＦＣの燃料電池の場合、断熱容器４の内部を７００℃〜１０００℃に昇温させて空気と燃料ガスをそれぞれ空気用のガス供給管２１と燃料用のガス供給管２３に供給すると、それぞれのガス供給路１４，１６を介して各ガスが空気室９と燃料室１２に充満し、それらが空気極８と電解質５と燃料極１１を介して反応を起こすため、空気極８を正極、燃料極１１を負極とする直流の電気エネルギが発生する。なお、燃料電池セル２内で電気エネルギが発生する原理は周知であるため説明を省略する。
そして、空気室９と燃料室１２で反応した後の各ガスは、それぞれがガス排出路１５，１７を通ってガス排出管２２，２４から外部に排出される。 [Power generation]
In the case of the SOFC fuel cell as in the embodiment, the inside of the heat insulating container 4 is heated to 700 ° C. to 1000 ° C., and the air and the fuel gas are respectively supplied to the air gas supply pipe 21 and the fuel gas supply pipe 23. When supplied, each gas fills the air chamber 9 and the fuel chamber 12 via the gas supply paths 14 and 16, and they react via the air electrode 8, the electrolyte 5 and the fuel electrode 11. DC electric energy is generated with 8 as the positive electrode and fuel electrode 11 as the negative electrode. In addition, since the principle which an electrical energy generate | occur | produces in the fuel cell 2 is known, description is abbreviate | omitted.
Each gas after reacting in the air chamber 9 and the fuel chamber 12 passes through the gas discharge passages 15 and 17 and is discharged to the outside from the gas discharge pipes 22 and 24.

前記のように空気極１４は、空気極集電体１０を介して上のインターコネクタ１２に電気的に接続され、一方、燃料極１５は、燃料極集電体１３を介して下のインターコネクタ７に電気的に接続されており、また、発電ユニット３は複数の燃料電池セル２，２…を積層して直列に接続された状態であるから、上のエンドプレート１８ａが正極で、下のエンドプレート１８ｂが負極になる。   As described above, the air electrode 14 is electrically connected to the upper interconnector 12 via the air electrode current collector 10, while the fuel electrode 15 is connected to the lower interconnector via the fuel electrode current collector 13. 7, and the power generation unit 3 is in a state in which a plurality of fuel cells 2, 2... Are stacked and connected in series, so that the upper end plate 18 a is the positive electrode, The end plate 18b becomes a negative electrode.

実施形態の燃料電池１は、発電ユニット３のコーナーに通した四つの締付け部材１９ａ〜１９ｄのうちの一つの締付け部材１９ａのみが上のエンドプレート１８ａに電気的に接続されており、また、別の一つの締付け部材１９ｂのみが下のエンドプレート１８ｂに電気的に接続されている。よって、この二つの締付け部材１９ａ，１９ｂが、発電ユニット３で発電した電気を断熱容器４の外に取り出す導電性の電流取り出し部材１９ａ，１９ｂを構成する。   In the fuel cell 1 of the embodiment, only one of the four fastening members 19a to 19d passed through the corner of the power generation unit 3 is electrically connected to the upper end plate 18a. Only one tightening member 19b is electrically connected to the lower end plate 18b. Therefore, the two tightening members 19a and 19b constitute conductive current extraction members 19a and 19b that extract the electricity generated by the power generation unit 3 to the outside of the heat insulating container 4.

燃料電池１は、上記の発電ユニット３と断熱容器４の他に、前記電流取り出し部材１９ａ，１９ｂに接続される端子金具２５と、その端子金具２５に接続される送電ケーブル２６と、を備えている。   The fuel cell 1 includes a terminal fitting 25 connected to the current extraction members 19a and 19b and a power transmission cable 26 connected to the terminal fitting 25 in addition to the power generation unit 3 and the heat insulating container 4 described above. Yes.

［送電ケーブル］
送電ケーブル２６は、例えば塩化ビニール等の樹脂製の絶縁被覆材２６ａの中に例えば銅線等の導電部２６ｂを通した公知のものである。 [Transmission cable]
The power transmission cable 26 is a known cable in which a conductive portion 26b such as a copper wire is passed through an insulating covering material 26a made of resin such as vinyl chloride.

［端子金具］
端子金具２５は、全体がほぼ羽子板形状で、例えば銅に錫メッキ又は亜鉛メッキを施した導電部品である。この端子金具２５は、羽子板の柄の部分に相当するケーブル接合部２７と、羽子板の板の部分に相当する接続部２８と、を有し、さらに該接続部２８と前記ケーブル接合部２７との間に放熱部２９を設けてなる。 [Terminal bracket]
The terminal fitting 25 is a conductive part in which the entirety is substantially a wing plate shape, for example, tin is plated or galvanized on copper. The terminal fitting 25 includes a cable joint portion 27 corresponding to the handle portion of the battledore, and a connection portion 28 corresponding to the portion of the battledore plate, and the connection portion 28 and the cable joint portion 27 are connected to each other. A heat radiation part 29 is provided between them.

［端子金具・ケーブル接合部］
前記ケーブル接合部２７は、送電ケーブル２６の絶縁被覆材２６ａを除去して剥き出し状態になっている導電部２６ｂにキャップ状に被さる封止状態で該送電ケーブル２６に固着されている。また、ケーブル接合部２７は、送電ケーブル２６の導電部２６ｂを締め付けるようにその外周を加締めることにより、該導電部２６ｂとの密閉性が確保されるようになっている。
なお、本実施形態では、このようにケーブル接合部２７と導電部２６ｂとの密閉性が確保されていれば、ケーブル接合部２７の端面と送電ケーブル２６の絶縁被覆材２６ａの端面同士の間ｔは緩い封止状態でも十分に効果を発揮するが、より好ましくはケーブル接合部２７の端面と送電ケーブル２６の絶縁被覆材２６ａの端面同士の間ｔについても気密が保たれる封止状態、つまり密閉状態にするのがよい。そうすることによりケーブル接合部２７と導電部２６ｂとの密閉性を二重に高めることができると共に導電部２６ｂが高温の酸化ガスや発電ユニット３から漏れ出ることがある微小な漏洩ガスにも晒されにくくなり、腐食等による劣化のおそれも減少する。 [Terminal bracket / Cable joint]
The cable joint portion 27 is fixed to the power transmission cable 26 in a sealed state so as to cover the conductive portion 26b that is exposed by removing the insulating coating material 26a of the power transmission cable 26. Further, the cable joint portion 27 is secured to the conductive portion 26b by crimping the outer periphery so as to tighten the conductive portion 26b of the power transmission cable 26.
In this embodiment, if the sealing property between the cable joint portion 27 and the conductive portion 26b is ensured as described above, the distance t between the end face of the cable joint portion 27 and the end face of the insulating covering material 26a of the power transmission cable 26 is t. Is sufficiently effective even in a loosely sealed state, but more preferably a sealed state in which airtightness is maintained between the end surfaces of the cable joint portion 27 and the end surfaces of the insulating coating material 26a of the power transmission cable 26, that is, It should be sealed. By doing so, the sealing property between the cable joint portion 27 and the conductive portion 26b can be doubled, and the conductive portion 26b is also exposed to high-temperature oxidizing gas and minute leak gas that may leak from the power generation unit 3. This reduces the risk of deterioration due to corrosion and the like.

［端子金具・接続部］
羽子板の板の部分に相当する接続部２８は、前記電流取り出し部材１９ａ，１９ｂに連結される接続穴２８ａを有する。この接続穴２８ａは、電流取り出し部材１９ａ，１９ｂを構成する前記ボルトが通るように形成されており、該電流取り出し部材１９ａ，１９ｂに対して図１、図８に示したナット２０ａ，２０ｂで固定される。 [Terminal bracket / connection]
The connection portion 28 corresponding to the plate portion of the battledore has a connection hole 28a connected to the current extraction members 19a and 19b. The connection hole 28a is formed so that the bolts constituting the current extraction members 19a and 19b can pass therethrough. The connection holes 28a are fixed to the current extraction members 19a and 19b by the nuts 20a and 20b shown in FIGS. Is done.

［端子金具・放熱部］
端子金具２５の放熱部２９は、前記接続部２８と前記ケーブル接合部２７との間に形成されており、最も簡単な形態としては距離を長くして十分な放熱面積を確保し、最終的にケーブル接合部２７への伝熱量が抑制されるようにすればよい。
もっとも、そうした場合には端子金具２５が大きくなるため、放熱部２９には放熱性を高めるために加工された放熱促進部２９ａを設けるのが好ましい。
実施形態の放熱促進部２９ａは、図４（ａ），（ｂ）に示したように貫通穴で形成されている。もちろん放熱促進部２９ａの形態はこれに限定されず、例えば図５に示したように面方向の波形の変形で形成するか、図６に示したように幅方向の波形の変形で形成してもよい。さらには図７（ａ），（ｂ）に示したように表面をディンプル状に窪ませて形成するか或はこれらの全てを適宜に組み合わせて形成してもよい。 [Terminal bracket / Heat dissipation part]
The heat dissipating part 29 of the terminal fitting 25 is formed between the connecting part 28 and the cable connecting part 27. As the simplest form, the distance is increased to ensure a sufficient heat dissipating area, and finally What is necessary is just to make it the heat transfer amount to the cable junction part 27 suppressed.
However, since the terminal metal fitting 25 becomes large in such a case, it is preferable to provide the heat radiating portion 29 with a heat radiating promotion portion 29a processed to improve the heat radiating performance.
As shown in FIGS. 4A and 4B, the heat dissipation promoting portion 29a of the embodiment is formed by a through hole. Of course, the form of the heat radiation promoting portion 29a is not limited to this. For example, the heat radiation promoting portion 29a is formed by changing the waveform in the surface direction as shown in FIG. 5, or formed by changing the waveform in the width direction as shown in FIG. Also good. Furthermore, as shown in FIGS. 7A and 7B, the surface may be formed in a dimple shape, or all of these may be combined appropriately.

以上のように構成される燃料電池１は、図８に示したように、発電電力を商用変換系統に供給するためのパワーコンディショナー３０に前記送電ケーブル２６を介して接続されており、該パワーコンディショナー３０と一緒に箱型のケーシング３１内に収められている。なお、送電ケーブル２６のパワーコンディショナー３０側の端部には、前記放熱部２９を有しない既存の端子金具３２が取り付けられている。
前記ケーシング３１内には空冷用の循環ファン３３が設置されており、その循環ファン３３の風向きが前記端子金具２５の放熱部２９に直接当たるように設定されている。 As shown in FIG. 8, the fuel cell 1 configured as described above is connected to a power conditioner 30 for supplying generated power to a commercial conversion system via the power transmission cable 26, and the power conditioner 30 is housed in a box-shaped casing 31. In addition, the existing terminal fitting 32 which does not have the said thermal radiation part 29 is attached to the edge part by the side of the power conditioner 30 of the power transmission cable 26. As shown in FIG.
A circulating fan 33 for air cooling is installed in the casing 31, and the wind direction of the circulating fan 33 is set so as to directly hit the heat radiating portion 29 of the terminal fitting 25.

実施形態の燃料電池１は以上のように構成されているため、発電ユニット３の発電時の高熱が、電流取り出し部材１９ａ，１９ｂから端子金具２５の接続部２８に伝わるが、端子金具２５の放熱部２９で適度に放熱されてケーブル接合部２７に伝わるため、該ケーブル接合部２７と送電ケーブル２６の導電部２６ｂの熱膨張が抑制される。したがって、高温環境下でもケーブル接合部２７と送電ケーブル２６の導電部２６ｂとの密閉性が保たれるため、送電ケーブル２６の導電部２６ｂが高温の酸化ガスに触れて酸化したり、発電ユニット３からの微小な漏洩ガスがあってもそれによる腐食の可能性が少なくなる。   Since the fuel cell 1 of the embodiment is configured as described above, high heat during power generation of the power generation unit 3 is transmitted from the current extraction members 19a and 19b to the connection portion 28 of the terminal fitting 25. Since heat is appropriately dissipated in the portion 29 and transmitted to the cable joint portion 27, thermal expansion of the cable joint portion 27 and the conductive portion 26b of the power transmission cable 26 is suppressed. Accordingly, since the hermeticity between the cable joint portion 27 and the conductive portion 26b of the power transmission cable 26 is maintained even in a high temperature environment, the conductive portion 26b of the power transmission cable 26 is oxidized by touching a high-temperature oxidizing gas, or the power generation unit 3 Even if there is a minute leak gas from the air, the possibility of corrosion is reduced.

以上本発明を実施の形態について説明したが、もちろん本発明は上記実施形態に限定されるものではない。例えば、実施形態では燃料電池１としてＳＯＦＣを例示したが、それ以外でも約５００℃以上の高温で発電を行う発電ユニット３を有する燃料電池に対して本発明の端子金具２５は有用性を発揮する。
また、実施形態では電流取り出し部材１９ａ，１９ｂを発電ユニット３の締付け部材１９ａ，１９ｂで形成したが、前記エンドプレート１８ａ，１８ｂに突片を形成して該突片を電流取り出し部材にしてもよい。 The embodiments of the present invention have been described above, but the present invention is of course not limited to the above embodiments. For example, although the SOFC is exemplified as the fuel cell 1 in the embodiment, the terminal fitting 25 of the present invention is useful for a fuel cell having the power generation unit 3 that generates power at a high temperature of about 500 ° C. or higher. .
In the embodiment, the current extraction members 19a and 19b are formed by the fastening members 19a and 19b of the power generation unit 3. However, the protrusions may be formed on the end plates 18a and 18b so as to be the current extraction members. .

１ …燃料電池
３ …発電ユニット
４ …断熱容器
１９ａ，１９ｂ …電流取り出し部材
２５ …端子金具
２６ …送電ケーブル
２６ｂ …導電部
２７ …ケーブル接合部
２８ …接続部
２９ …放熱部
２９ａ …放熱促進部
３１ …ケーシング
３３ …循環ファン DESCRIPTION OF SYMBOLS 1 ... Fuel cell 3 ... Power generation unit 4 ... Heat insulation container 19a, 19b ... Current extraction member 25 ... Terminal metal fitting 26 ... Power transmission cable 26b ... Conductive part 27 ... Cable junction part 28 ... Connection part 29 ... Heat radiation part 29a ... Heat radiation promotion part 31 ... Casing 33 ... Circulating fan

Claims (7)

高温で発電を行う発電ユニットと、
その発電ユニットを囲う断熱容器と、
前記発電ユニットで発電した電気を前記断熱容器の外に取り出す導電性の電流取り出し部材と、
前記断熱容器の外で導電性の端子金具を介して前記電流取り出し部材に接続される送電ケーブルと、を備える燃料電池において、
前記端子金具は、
前記送電ケーブルの導電部にキャップ状に被さり封止状態で該送電ケーブルに固着されるケーブル接合部と、
前記電流取り出し部材に連結される接続部と、を有し、
前記端子金具の前記ケーブル接合部と前記接続部との間に放熱部を設けてなることを特徴とする燃料電池。 A power generation unit that generates power at a high temperature;
An insulated container surrounding the power generation unit,
A conductive current extraction member for extracting electricity generated by the power generation unit to the outside of the heat insulation container;
In a fuel cell comprising: a power transmission cable connected to the current extraction member via a conductive terminal fitting outside the heat insulating container;
The terminal fitting is
A cable joint that covers the conductive portion of the power transmission cable in a cap shape and is fixed to the power transmission cable in a sealed state;
A connection portion coupled to the current extraction member,
A fuel cell, wherein a heat radiation portion is provided between the cable joint portion and the connection portion of the terminal fitting. 前記放熱部は、放熱性を高めるために加工された放熱促進部を有することを特徴とする請求項１に記載の燃料電池。   The fuel cell according to claim 1, wherein the heat dissipating part includes a heat dissipating promotion part processed to improve heat dissipation. 前記放熱促進部は、貫通穴で形成されていることを特徴とする請求項２に記載の燃料電池。   The fuel cell according to claim 2, wherein the heat dissipation promoting part is formed by a through hole. 前記放熱促進部は、波形の変形で形成されていることを特徴とする請求項２に記載の燃料電池。   The fuel cell according to claim 2, wherein the heat radiation promoting portion is formed by a waveform deformation. 前記放熱促進部は、表面をディンプル状に窪ませて形成されていることを特徴とする請求項２に記載の燃料電池。   3. The fuel cell according to claim 2, wherein the heat radiation promoting portion is formed with a dimple-shaped surface. 前記断熱容器と前記送電ケーブルとを一つのケーシングに納めると共に該ケーシング内に空冷用の循環ファンを設置し、その循環ファンの風が直接当たる位置に前記放熱部を配置するようにしたことを特徴とする請求項１〜５の何れか１項に記載の燃料電池。   The heat insulation container and the power transmission cable are housed in one casing, and a circulation fan for air cooling is installed in the casing, and the heat radiating portion is arranged at a position where the wind of the circulation fan directly hits. The fuel cell according to any one of claims 1 to 5. 前記ケーブル接合部は、前記送電ケーブルの前記導電部と密閉状態で固着されていることを特徴とする請求項１〜６の何れか１項に記載の燃料電池。   The fuel cable according to any one of claims 1 to 6, wherein the cable joint portion is fixed in a sealed state to the conductive portion of the power transmission cable.
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