JP4821662B2 - 燃料電池システム - Google Patents
燃料電池システム Download PDFInfo
- Publication number
- JP4821662B2 JP4821662B2 JP2007061810A JP2007061810A JP4821662B2 JP 4821662 B2 JP4821662 B2 JP 4821662B2 JP 2007061810 A JP2007061810 A JP 2007061810A JP 2007061810 A JP2007061810 A JP 2007061810A JP 4821662 B2 JP4821662 B2 JP 4821662B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel cell
- power generation
- oxidizing gas
- command value
- power
- 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.)
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- 239000000446 fuel Substances 0.000 title claims description 208
- 239000007789 gas Substances 0.000 claims description 97
- 230000001590 oxidative effect Effects 0.000 claims description 74
- 238000010248 power generation Methods 0.000 claims description 71
- 230000007423 decrease Effects 0.000 claims description 40
- 239000002737 fuel gas Substances 0.000 claims description 29
- 239000003792 electrolyte Substances 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 14
- 239000003054 catalyst Substances 0.000 claims description 12
- 239000007800 oxidant agent Substances 0.000 claims description 12
- 230000001172 regenerating effect Effects 0.000 claims description 11
- 238000010792 warming Methods 0.000 claims description 3
- 238000006479 redox reaction Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 14
- 239000001257 hydrogen Substances 0.000 description 12
- 229910052739 hydrogen Inorganic materials 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 11
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 7
- 230000004043 responsiveness Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
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- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- -1 hydrogen ions Chemical class 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
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- 230000003647 oxidation Effects 0.000 description 3
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- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000005518 polymer electrolyte Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910002845 Pt–Ni Inorganic materials 0.000 description 1
- 229910002848 Pt–Ru Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000002484 cyclic voltammetry Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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Description
図1は本実施形態に係わる燃料電池システム10のシステム構成を示す。
燃料電池システム10は、燃料電池車両に搭載される車載電源システムとして機能するものであり、反応ガス(燃料ガス、酸化ガス)の供給を受けて発電する燃料電池スタック20と、酸化ガスとしての空気を燃料電池スタック20に供給するための酸化ガス供給系30と、燃料ガスとしての水素ガスを燃料電池スタック20に供給するための燃料ガス供給系40と、電力の充放電を制御するための電力系50と、燃料電池スタック20を冷却するための冷却系60と、システム全体を制御するコントローラ(ECU)70とを備えている。
(1/2)O2+2H++2e- → H2O …(2)
H2+(1/2)O2 → H2O …(3)
セル21は、電解質膜22と、アノード極23と、カソード極24と、セパレータ26,27とから構成されている。アノード極23及びカソード極24は、電解質膜22を両側から挟んでサンドイッチ構造を成す拡散電極である。ガス不透過の導電性部材から構成されるセパレータ26,27は、このサンドイッチ構造をさらに両側から挟みつつ、アノード極23及びカソード極24との間にそれぞれ燃料ガス及び酸化ガスの流路を形成する。セパレータ26には、断面凹状のリブ26aが形成されている。リブ26aにアノード極23が当接することで、リブ26aの開口部は閉塞され、燃料ガス流路が形成される。セパレータ27には、断面凹状のリブ27aが形成されている。リブ27aにカソード極24が当接することで、リブ27aの開口部は閉塞され、酸化ガス流路が形成される。
このC−V特性は、燃料電池スタック20の動的な電気特性を示すものであり、燃料電池スタック20の電圧を一定の速度で昇圧させていくと、外部から燃料電池スタック20へ流れ込む方向(マイナス方向)に電流が流れ、燃料電池スタックの電圧を一定の速度で降圧させていくと、燃料電池スタック20から外部へ流れる方向(プラス方向)に電流が流れる。このような動的な電気特性は、燃料電池スタック20が寄生的に有する容量成分によるものであることが判明している。
燃料電池スタック20は、理想燃料電池28とキャパシタ29とが並列接続されてなる回路構成を有している。理想燃料電池28は、上述のC−V特性を有しない仮想的な燃料電池をモデル化したものであり、電気特性上、可変電源と等価な振る舞いをする。キャパシタ29は、上記界面に形成される電気二重層の電気的な振る舞いを容量素子としてモデル化したものである。外部負荷56は電力系50をモデル化した等価回路である。理想燃料電池28から流れ出す電流をIfc、理想燃料電池28の出力電圧(燃料電池スタック20の出力電圧)をVfc、キャパシタ29に流れ込む電流をIc、燃料電池スタック20から外部負荷56に流れ出す電流をIs、キャパシタ29の容量をC、時間をtとすると、以下に示す(4)〜(5)式が成立する。
Ic=C・ΔVfc/Δt …(5)
通常運転時には、発電効率を高めるため、運転ポイント(出力電流Ifc、出力電圧Vfc)がI−V特性曲線200上に位置するように運転制御する。一方、低効率運転時には、発電効率を意図的に低下させて熱損失を高めるので、運転ポイントは、I−V特性曲線200よりも低い電圧ポイント、例えば、出力電圧Vfc=V1に設定される。V低効率運転では、出力電圧VfcはV1に固定されるので、エアコンプレッサ32から燃料電池スタック20に供給される酸化ガス流量を制御することにより出力電流Ifcを調整し、運転負荷(例えば、アクセル開度)に応じた発電制御を実施する。
Claims (8)
- 燃料ガス及び酸化ガスの供給を受けて発電する燃料電池と、
前記燃料電池に前記燃料ガスを供給するための燃料ガス供給装置と、
前記燃料電池に前記酸化ガスを供給するための酸化ガス供給装置と、
通常運転に比して発電効率の低い低効率運転により燃料電池を暖機する暖機手段と、
低効率運転時に前記燃料電池の出力電圧を一定の電圧値に設定し、且つ、前記燃料電池への酸化ガス供給量を可変制御することにより、要求電力に応じた発電制御を実施し、前記低効率運転を実施している最中に前記燃料電池に対する発電指令値が減少した場合において、前記発電指令値の減少に追従するように前記燃料電池への酸化ガス供給を制御できる場合には、前記燃料電池の出力電圧を一定に保持したまま、前記燃料電池への酸化ガス供給を絞る一方、前記発電指令値の減少に追従するように前記燃料電池への酸化ガス供給を制御できない場合には、前記燃料電池への酸化ガス供給を絞るとともに、前記燃料電池の出力電圧を昇圧させることにより、前記発電指令値を超える余剰電力を、前記燃料電池の触媒層と電解質膜との界面に寄生的に形成される電気二重層の容量成分に充電する制御手段と、
を備える燃料電池システム。 - 請求項1に記載の燃料電池システムであって、
前記低効率運転は、前記燃料電池の電流対電圧特性曲線より定まる電圧値よりも低い電圧値を有する運転ポイントで電池運転することである、燃料電池システム。 - 請求項1又は請求項2に記載の燃料電池システムであって、
前記酸化ガス供給装置は、回生ブレーキを備えており、前記低効率運転を実施している最中に前記燃料電池に対する発電指令値が減少した場合に、前記回生ブレーキによる回生制動により、前記発電指令値の減少に追従して前記燃料電池への酸化ガス供給を減少させる、燃料電池システム。 - 請求項1又は請求項2に記載の燃料電池システムであって、
前記酸化ガス供給装置は、機械式ブレーキを備えており、前記低効率運転を実施している最中に前記燃料電池に対する発電指令値が減少した場合に、前記機械式ブレーキによる制動により、前記発電指令値の減少に追従して前記燃料電池への酸化ガス供給を減少させる、燃料電池システム。 - 請求項1又は請求項2に記載の燃料電池システムであって、
前記制御手段は、前記低効率運転を実施している最中に前記燃料電池に対する発電指令値が減少した場合に、前記発電指令値の減少に追従して前記燃料電池への酸化ガス供給が減少するように前記発電指令値の減少を緩やかにする、燃料電池システム。 - 請求項1又は請求項2に記載の燃料電池システムであって、
前記酸化ガス供給装置から供給される酸化ガスの一部を、前記燃料電池をバイパスして排気するためのバイパス手段を更に備え、
前記バイパス手段は、前記低効率運転を実施している最中に前記燃料電池に対する発電指令値が減少した場合に、前記バイパス手段を通過する酸化ガスのバイパス流量を制御することにより、前記発電指令値の減少に追従して前記燃料電池への酸化ガス供給を減少させる、燃料電池システム。 - 請求項1又は請求項2に記載の燃料電池システムであって、
前記余剰電力を充電するための蓄電装置を更に備える、燃料電池システム。 - 請求項1に記載の燃料電池システムであって、
前記容量成分の容量値は、前記触媒層の酸化還元反応により変動するものである、燃料電池システム。
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DE112008000649.0T DE112008000649B8 (de) | 2007-03-12 | 2008-03-10 | Brennstoffzellensystem |
KR1020097018995A KR101109714B1 (ko) | 2007-03-12 | 2008-03-10 | 연료전지 시스템 |
US12/447,577 US8088527B2 (en) | 2007-03-12 | 2008-03-10 | Fuel cell system |
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2007
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2008
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- 2008-03-10 KR KR1020097018995A patent/KR101109714B1/ko active IP Right Grant
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Publication number | Publication date |
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CN101578732B (zh) | 2012-01-25 |
JP2008226591A (ja) | 2008-09-25 |
US20100055522A1 (en) | 2010-03-04 |
KR101109714B1 (ko) | 2012-03-02 |
CN101578732A (zh) | 2009-11-11 |
DE112008000649T5 (de) | 2010-01-07 |
WO2008114761A1 (ja) | 2008-09-25 |
DE112008000649B4 (de) | 2014-09-11 |
US8088527B2 (en) | 2012-01-03 |
DE112008000649B8 (de) | 2014-11-06 |
KR20090109588A (ko) | 2009-10-20 |
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