IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0947686
(2001-09-06)
|
우선권정보 |
JP-0270722 (2000-09-06) |
발명자
/ 주소 |
- Okamoto, Takafumi
- Ise, Masahiro
- Sato, Shuji
|
출원인 / 주소 |
- Honda Giken Kogyo Kabushiki Kaisha
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
5 |
초록
▼
A fuel cell system comprises a medium-circulating passage for supplying, in a circulating manner, a temperature-adjusting medium to a fuel cell stack, and first and second temperature sensors for detecting medium temperatures at a temperature-adjusting medium inlet and a temperature-adjusting medium
A fuel cell system comprises a medium-circulating passage for supplying, in a circulating manner, a temperature-adjusting medium to a fuel cell stack, and first and second temperature sensors for detecting medium temperatures at a temperature-adjusting medium inlet and a temperature-adjusting medium outlet. The medium-circulating passage is provided with a pump for circulating the medium, a heater for heating the medium, a radiator for cooling the medium, a bypass passage for bypassing the radiator, and first through third opening/closing valves for selectively supplying the temperature-adjusting medium to the radiator and the bypass passage.
대표청구항
▼
1. A fuel cell system comprising:a phosphoric acid fuel cell stack including a plurality of stacked power-generating cells each having a joined unit including an electrolyte impregnated with phosphoric acid and interposed between an anode electrode and a cathode electrode, said joined unit being int
1. A fuel cell system comprising:a phosphoric acid fuel cell stack including a plurality of stacked power-generating cells each having a joined unit including an electrolyte impregnated with phosphoric acid and interposed between an anode electrode and a cathode electrode, said joined unit being interposed between separators;a medium-circulating passage communicating with a medium inlet and a medium outlet of said phosphoric acid fuel cell stack, for supplying, in a circulating manner, a temperature-adjusting medium into said phosphoric acid fuel cell stack; andfirst and second temperature sensors for detecting medium temperatures at said medium inlet and said medium outlet,wherein said medium-circulating passage is arranged with:a pump for circulating said medium;a heater for heating said medium;a heat exchanger for cooling said medium;a bypass passage for bypassing said heat exchanger; andmedium flow passage-switching means for selectively supplying said temperature-adjusting medium to said heat exchanger and said bypass passage. 2. The fuel cell system according to claim 1, wherein said medium flow passage-switching means comprises:first and second opening/closing valves for performing opening/closing operation on an inlet side and an outlet side of said heat exchanger; anda third opening/closing valve for opening/closing said bypass passage. 3. The fuel cell system according to claim 1,wherein a fuel gas inlet, an oxygen-containing gas inlet, and said medium outlet are provided on a first end side in a stacking direction of said phosphoric acid fuel cell stack, andwherein a fuel gas outlet, an oxygen-containing gas outlet, and said medium inlet are provided on a second end side in said stacking direction of said phosphoric acid fuel cell stack. 4. The fuel cell system according to claim 1,wherein a temperature-adjusting cell is installed with a plurality of said intervening power-generating cells in said phosphoric acid fuel cell stack, andwherein a temperature-adjusting medium passage for supplying said temperature-adjusting medium, which is electrically insulated from said power-generating cells, is provided for said temperature-adjusting cell. 5. The fuel cell system according to claim 1, further comprising:a temperature-measuring/judging circuit connected to said first and second temperature sensors;an opening/closing valve control circuit for controlling said medium flow passage-switching means;a gas flow rate control circuit for controlling flow rates of fuel gas and oxygen-containing gas to be supplied to said phosphoric acid fuel cell stack; anda heater control circuit for controlling said heater,wherein said opening/closing valve control circuit, said gas flow rate control circuit, and said heater control circuit are controlled on the basis of a signal processed by said temperature-measuring/judging circuit. 6. The fuel cell system according to claim 5,wherein electric power generated by said phosphoric acid fuel cell stack is supplied to said heater by said heater control circuit by the aid of an electric power distributor. 7. A method for operating a fuel cell system which comprises a medium-circulating passage communicating with a medium inlet and a medium outlet of a phosphoric acid fuel cell stack, for supplying a temperature-adjusting medium into said phosphoric acid fuel cell stack and in which said medium-circulating passage is arranged with a pump for circulating said medium, a heater for heating said medium, a heat exchanger for cooling said medium, and a bypass passage for bypassing said heat exchanger, said method comprising the steps of:supplying, in a circulating manner, said temperature-adjusting medium into said phosphoric acid fuel cell stack and detecting a medium temperature of said phosphoric acid fuel cell stack at said medium inlet and a medium temperature of said phosphoric acid fuel cell stack at said medium outlet; andsupplying said temperature-adjusting medium to said bypass passage with out supplying said temperature-adjusting medium to said heat exchanger and supplying electric power to said heater from power-generating cells in said phosphoric acid fuel cell stack to heat said temperature-adjusting medium, when a value, which is obtained by subtracting said medium temperature at said medium inlet from said medium temperature at said medium outlet, is not more than 0.
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