[특허]Method and apparatus for removing water from electrochemical fuel cells by controlling the temperature and pressure of t

Method and apparatus for removing water from electrochemical fuel cells by controlling the temperature and pressure of t 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01M-008/00 H01M-008/04 H01M-008/10
출원번호	US-0138714 (1993-10-19)
발명자 / 주소	Voss Henry H. (North Vancouver CAX) Wilkinson David P. (North Vancouver CAX) Watkins David S. (Coquitlam CAX)
출원인 / 주소	Ballard Power Systems Inc. (North Vancouver CAX 03)
인용정보	피인용 횟수 : 44 인용 특허 : 0

초록 ▼

A method and apparatus is provided for removing water accumulated at the cathode of an electrochemical fuel cell incorporating a solid polymer ion exchange membrane. Liquid water accumulated at the cathode can be removed by maintaining a partial pressure of water vapor in the hydrogen-containing gas supply below the saturation pressure of water vapor therein such that water accumulated at the cathode is drawn by a concentration gradient toward the anode across the membrane and is absorbed as water vapor into the hydrogen-containing gas supply between the inlet and the outlet. In one embodiment, the partial pressure of water vapor in the hydrogen-containing gas supply is maintained below the saturation pressure of water vapor therein by imparting a pressure drop between the inlet and the outlet sufficient to draw water accumulated at the cathode toward the anode. In another embodiment, the partial pressure of water vapor at the inlet of the hydrogen-containing gas supply is maintained at less than the saturation pressure of water vapor therein. Liquid water accumulated at the cathode can also be removed by maintaining a partial pressure of water vapor in the oxygen-containing gas supply below the saturation pressure of water vapor therein such that water accumulated at the cathode is drawn by a concentration gradient and is absorbed as water vapor into the oxygen-containing gas supply between the inlet and the outlet. Liquid water accumulated at the cathode can also be removed by absorbing water vapor into both the hydrogen-containing gas supply and the oxygen-containing gas supply.

대표청구항 ▼

A method of removing water accumulated at the cathode of an electrochemical fuel cell, said fuel cell comprising an anode having a catalyst associated therewith for producing cations from a hydrogen-containing gas supply, said hydrogen-containing gas supply having an inlet, an outlet and a fluid flow passage communicating with said anode along its extent; a cathode having a catalyst associated therewith for producing anions from an oxygen-containing gas supply, said anions reacting with said cations to form liquid water at said cathode; a solid polymer ion exchange membrane disposed between said anode and said cathode, said membrane facilitating the migration of cations from said anode to said cathode and isolating said hydrogen-containing gas supply from said oxygen-containing gas supply, said membrane permeable to water; and an electrical path for conducting the electrons formed at said anode to said cathode; said method comprising: removing liquid water accumulated at said cathode by controlling the temperature of said hydrogen-containing gas supply between said inlet and said outlet such that said temperature remains above the condensation temperature of water vapor contained therein, whereby water accumulated at said cathode is drawn by a concentration gradient toward said anode across said membrane and is absorbed as water vapor into said hydrogen-containing gas supply.

이 특허를 인용한 특허 (44)

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Oko Uriel M. ; Kralick James H., Fuel cell system having humidification membranes.
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Subramanian T. M. Iyer, Fuel cell with low cathodic polarization and high power density.
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Carlstrom ; Jr. Charles M. ; Maynard William B., Fuel cell with selective pressure variation and dynamic inflection.
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Issacci, Farrokh; Rehg, Timothy J., Gas block mechanism for water removal in fuel cells.
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Scortichini Carey L. ; Mussell Robert D. ; Babinec Susan J., Macroporous flow field assembly.
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Method and apparatus for removing water from electrochemical fuel cells by controlling the temperature and pressure of t 원문보기

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Method and apparatus for removing water from electrochemical fuel cells by controlling the temperature and pressure of t 원문보기

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