| US 7,507,490 B2 | ||
| Metal separator for fuel cell and its production method | ||
| Teruyuki Ohtani, Wako (Japan); Makoto Tsuji, Wako (Japan); Masao Utsunomiya, Wako (Japan); and Koji Kotani, Saitama (Japan) | ||
| Assigned to Honda Giken Kogyo Kabushiki Kaisha, Tokyo (Japan) | ||
| Appl. No. 10/496,317 PCT Filed Nov. 01, 2002, PCT No. PCT/JP02/11467 § 371(c)(1), (2), (4) Date Sep. 22, 2004, PCT Pub. No. WO03/049220, PCT Pub. Date Jun. 12, 2003. |
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| Claims priority of application No. 2001-373740 (JP), filed on Dec. 07, 2001; application No. 2001-390216 (JP), filed on Dec. 21, 2001; application No. 2001-396168 (JP), filed on Dec. 27, 2001; application No. 2001-399629 (JP), filed on Dec. 28, 2001; and application No. 2002-072786 (JP), filed on Mar. 15, 2002. | ||
| Prior Publication US 2005/0051431 A1, Mar. 10, 2005 | ||
| Int. Cl. H01M 2/00 (2006.01) | ||
| U.S. Cl. 429—34 [429/38; 205/57] | 1 Claim |
| 1. A production method for a metallic separator for a fuel cell by press-forming, comprising:
projecting conductive inclusions from a surface of the separator, wherein when the minimum bending R value among one or more
bending radii in the press-forming is defined as r (micrometers),
wherein r is 0.05 to 0.5 mm,
and an average area of the conductive inclusions in a cross-section of plate thickness direction in a separator material plate
before the press-forming is defined as S (square of micrometers), r and S satisfy the formulas:
1≤0.56×S1/2
1.77×S1/2÷r≤0.1.
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