IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0708346
(2010-02-18)
|
등록번호 |
US-8158287
(2012-04-17)
|
우선권정보 |
JP-2004-347668 (2004-11-30); JP-2005-285040 (2005-09-29) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
McDermott Will & Emery LLP
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
6 |
초록
▼
A fuel cell system which provides stable cell outputs at startup. The fuel cell system comprises: a fuel cell stack including a laminate formed by combining a membrane electrode assembly composed of an electrolyte membrane, an anode jointed to one side of the electrolyte membrane, and a cathode join
A fuel cell system which provides stable cell outputs at startup. The fuel cell system comprises: a fuel cell stack including a laminate formed by combining a membrane electrode assembly composed of an electrolyte membrane, an anode jointed to one side of the electrolyte membrane, and a cathode joined to the other side of the electrolyte membrane, with a fuel channel plate having a fuel channel for supplying a fuel to the anode, an oxidant channel plate having an oxidant channel for supplying an oxidant to the cathode, and a coolant channel plate having a coolant channel for a coolant to flow through; piping and a circulation pump necessary for cooling the coolant exhausted from the fuel cell stack before putting the coolant into the fuel cell stack for circulation; a fuel humidifier which humidifies the fuel by heat exchange with the coolant; an air humidifier which humidifies the air by heat exchange with the coolant; and a control unit which continues the circulation of the coolant in a system stopping process until a predetermined cooling stop condition holds, and stops power generation of the fuel cell when the predetermined cooling stop condition holds.
대표청구항
▼
1. A fuel cell system comprising: a fuel cell stack including a laminate formed by combining a membrane electrode assembly comprising an electrolyte membrane, an anode on one side of the electrolyte membrane, and a cathode on the other side of the electrolyte membrane, with a fuel channel plate havi
1. A fuel cell system comprising: a fuel cell stack including a laminate formed by combining a membrane electrode assembly comprising an electrolyte membrane, an anode on one side of the electrolyte membrane, and a cathode on the other side of the electrolyte membrane, with a fuel channel plate having a fuel channel for supplying a fuel to the anode, an oxidant channel plate having an oxidant channel for supplying an oxidant to the cathode, and a heat-medium channel plate having a heat-medium channel for a heat medium to flow through;a unit which cools the heat medium exhausted from the fuel cell stack before the heat medium is put into the fuel cell stack for circulation; anda control unit which, in a system stopping process, continues the circulation of the heat medium and continues to generate power until a temperature of the heat medium exhausted from the fuel cell reaches a predetermined temperature lower than a normal power generation temperature, interrupts a load current when the temperature of the heat medium drops below a predetermined temperature, and stops cooling the heat medium when a predetermined cooling stop condition is met. 2. The fuel cell system according to claim 1, wherein the control unit adjusts an amount of circulation of the heat medium so that a difference between a temperature of the heat medium exhausted from the fuel cell stack and a temperature of the heat medium put into the fuel cell stack falls within a predetermined range during a period in the system stopping process until the predetermined cooling stop condition is met. 3. The fuel cell system according to claim 1, wherein the cooling stop condition determined by the control unit is that a temperature of the heat medium exhausted from the fuel cell stack falls below a value determined as a function of outside air temperature. 4. The fuel cell system according to claim 2, wherein the cooling stop condition determined by the control unit is that a temperature of the heat medium exhausted from the fuel cell stack falls below a value determined as a function of outside air temperature. 5. The fuel cell system according to claim 1, wherein the cooling stop condition determined by the control unit is that a predetermined time elapses since the system stopping process is started. 6. The fuel cell system according to claim 2, wherein the cooling stop condition determined by the control unit is that a predetermined time elapses since the system stopping process is started. 7. The fuel cell system according to claim 3, wherein the cooling stop condition determined by the control unit is that a predetermined time elapses since the system stopping process is started. 8. The fuel cell system according to claim 4, wherein the cooling stop condition determined by the control unit is that a predeteiniined time elapses since the system stopping process is started. 9. A fuel cell system comprising: a fuel cell stack including a laminate formed by combining a membrane electrode assembly comprising an electrolyte membrane, an anode on one side of the electrolyte membrane, and a cathode on the other side of the electrolyte membrane, with a fuel channel plate having a fuel channel for supplying a fuel to the anode, an oxidant channel plate having an oxidant channel for supplying an oxidant to the cathode, and a heat-medium channel plate having a heat-medium channel for a heat medium to flow through;a unit which cools the heat medium exhausted from the fuel cell stack before the heat medium is put into the fuel cell stack for circulation;a fuel humidifying unit which humidifies the fuel by heat exchange with the heat medium;an oxidant humidifying unit which humidifies the oxidant by heat exchange with the heat medium; anda control unit which, in a system stopping process, continues circulation of the heat medium and generation of power until a temperature of the heat medium exhausted from the fuel cell reaches a predetermined temperature lower than a normal power generation temperature, interrupts a load current when the temperature of the heat medium exhausted from the fuel cell drops below a predetermined temperature, and stops cooling the heat medium when a predetermined cooling stop condition is met. 10. The fuel cell system according to claim 9, wherein the control unit adjusts an amount of circulation of the heat medium so that a difference between a temperature of the heat medium exhausted from the fuel cell stack and a temperature of the heat medium put into the fuel cell stack falls within a predetermined range during a period in the system stopping process until the predetermined cooling stop condition is met. 11. The fuel cell system according to claim 9, wherein the cooling stop condition determined by the control unit is that a temperature of the heat medium exhausted from the fuel cell stack falls below a value determined as a function of outside air temperature. 12. The fuel cell system according to claim 10, wherein the cooling stop condition determined by the control unit is that a temperature of the heat medium exhausted from the fuel cell stack falls below a value determined as a function of outside air temperature. 13. The fuel cell system according to claim 9, wherein the cooling stop condition determined by the control unit is that a predetermined time elapses since the system stopping process is started. 14. The fuel cell system according to claim 10, wherein the cooling stop condition determined by the control unit is that a predetermined time elapses since the system stopping process is started. 15. A fuel cell system comprising: a fuel cell stack including a laminate formed by combining a membrane electrode assembly comprising an electrolyte membrane, an anode on one side of the electrolyte membrane, and a cathode on the other side of the electrolyte membrane, with a fuel channel plate having a fuel channel for supplying a fuel to the anode, an oxidant channel plate having an oxidant channel for supplying an oxidant to the cathode, and a heat-medium channel plate having a heat-medium channel for a heat medium to flow through;a unit which cools the heat medium exhausted from the fuel cell stack before the heat medium is put into the fuel cell stack for circulation; anda control unit which, in a system stopping process, continues circulation of the heat medium and generation of power until a predetermined cooling stop condition is met, and stops cooling the heat medium and interrupts a load current when the predetermined cooling stop condition is met,wherein the control unit adjusts an amount of circulation of the heat medium so that a difference between a temperature of the heat medium exhausted from the fuel cell stack and a temperature of the heat medium put into the fuel cell stack falls within a predetermined range while the circulation of the heat medium continues. 16. The fuel cell system according to claim 15, wherein the cooling stop condition determined by the control unit is that a temperature of the heat medium exhausted from the fuel cell stack falls below a value determined as a function of outside air temperature. 17. The fuel cell system according to claim 15, wherein the cooling stop condition deteiniined by the control unit is that a predetermined time elapses since the system stopping process is started.
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