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Fuel cell cooled by latent heat of water evaporation
| Details |
Inventors: Horiguchi, Munehisa; Kato, Hidemi; Ueno, Masataka;
Assignee: Kabushikikaisha Equos Research (Tokyo, JP)
Primary Examiner: Ryan; Patrick Joseph
Assistant Examiner: Hodge; Robert
Attorney, Agent or Firm: Bacon & Thomas, PLLC
A fuel cell wherein efficient cooling is achieved by supplying air and cooling water simultaneously while maintaining cooling and wetting of a membrane without increasing the size of the fuel cell. The fuel cell includes a separator sandwiched between unit cells. The separator includes an air passage on a front surface side abutting at least on a cathode of the unit cell and cooling passages supplied with air and water on the rear side thereof to cool the unit cell with latent heat of evaporation of water by heat of the unit cell transmitted to the cooling space. Thereby, the unit cell is cooled via the separator and clogging of the air passages by water is prevented. |
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DETAILED DESCRIPTION Therefore, an object of the present invention is to maintain both cooling and wetting of a membrane.
Further, the present invention provides a fuel cell that enables more efficient cooling without enlarging the fuel cell.
The above-described object is achieved by providing a fuel cell including a plurality of unit cells each including an anode and a cathode and a plurality of separators, each arranged between the unit cells, wherein the separator comprises an air passage on a front face side in contact with the cathode of the unit cell and a cooling passage supplied with air and water on a back face side thereof, the air passage and the cooling passage communicate through a through-hole passing through the separator so as to cool the unit cells by latent heat of evaporation of water in the cooling space and to supply the air passage with vapor through the through-hole.
It is advantageous to include the cooling space (passage) within the separator and arranged adjacent to the air passage.
In the above-described structure, it is also advantageous to fabricate the separator of a pressed plate material, wherein a space between raised portions protruding from a plate surface serves as the air passage, and a space on a back side of the raised portions serves as the cooling passage.
It is further advantageous to have the wall surface surrounding the cooling passage of the separator be hydrophilic on at least on a portion thereof.
In the above-described structure the air passage may have one end closed, while communication with the cooling passage is maintained through the through-holes spaced along the way from the closed end to the open end.
A smaller amount of liquid water is supplied to the air passage than to the cooling passage.
A cooling passage on an inlet side is connected to a manifold supplying air and water, while an outlet side serves as an open passage.
Preferably, the separator is made of metal with high corrosion resistance.
More preferably, the separator is made of stainless steel
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