Separator for fuel cell and manufacture thereof
AssigneeKabushiki Kaisha Toyota Chuo Kenkyusho
InventorsFumio Nonoyama, Kenichi Suzuki
Life of this patent
Estimating the term…
Abstract
The present invention provides a fuel cell separator which is capable of maintaining a low and stable contact resistance at a state of an oxidizing water vapor atmosphere for a long time. The separator 20 has a separator base 22 facing electrodes 14, 16, and there are a plurality of projections 24 on a surface of the separator base 22. AS the projections 24, a Sn—Bi alloy, a Sn—Bi alloy containing Ag or the like are preferable. The separator is produced by adhering a molten bath 32, composed of a Sn alloy, to the separator base 22, then pressing a die 34 with numerous small-holes 34a against the molten bath 32, and then pouring the molten bath 32 into a cavity formed by the base 22 and small-holes 34a.
Claims22
A fuel cell separator comprising a separator base and a contact part on a surface of said base, wherein said contact part has a contact face and is adapted for contacting and facing any one of electrodes, one of which is an anode formed on one side of a solid polymer electrolyte, and the other of which is a cathode formed on the other side of said solid polymer electrolyte, and for collecting current by making contact with said electrode and for forming gas passages, wherein said contact part comprises a Sn alloy containing Bi in the range of 3 to 20 wt %.
A method for producing a fuel cell separator comprising a separator base and a contact part on a surface of said base, wherein said contact part has a contact face and is adapted for contacting and facing any one of electrodes, one of which is an anode formed on one side of a solid polymer electrolyte, and the other of which is a cathode formed on the other side of said solid polymer electrolyte, and for collecting current by making contact with said electrode and for forming gas passages, comprising:
- forming a contact part comprising a Sn alloy containing Bi in the range of 3 to 20 wt % by a process of die working.
A method for producing a fuel cell separator comprising a separator base and a contact part on a surface of said base, wherein said contact part has a contact face and is adapted for contacting and facing any one of electrodes, one of which is an anode formed on one side of a solid polymer electrolyte, and the other of which is a cathode formed on the other side of said solid polymer electrolyte, and for collecting current by making contact with said electrode and for forming gas passages, comprising:
- forming a coating layer of a Sn alloy containing Bi in the range of 3 to 20 wt % on a surface of said contact part.
Dependencies are inferred from the claim text.