US 12,444,766 B2
Fuel cell stack
Haruyuki Aono, Aichi-ken (JP); Satoshi Kawabe, Ichinomiya (JP); and Naohiro Matsubara, Takahama (JP)
Assigned to TOYOTA BOSHOKU KABUSHIKI KAISHA, Aichi-Ken (JP)
Filed by TOYOTA BOSHOKU KABUSHIKI KAISHA, Aichi-ken (JP)
Filed on Feb. 17, 2023, as Appl. No. 18/111,297.
Claims priority of application No. 2022-026999 (JP), filed on Feb. 24, 2022; and application No. 2022-027000 (JP), filed on Feb. 24, 2022.
Prior Publication US 2023/0268544 A1, Aug. 24, 2023
Int. Cl. H01M 8/2483 (2016.01); H01M 8/026 (2016.01); H01M 8/1004 (2016.01)
CPC H01M 8/2483 (2016.02) [H01M 8/026 (2013.01); H01M 8/1004 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fuel cell stack, comprising single cells stacked in a first direction, wherein
each single cell includes:
a power generating unit; and
a first separator and a second separator that hold the power generating unit between the first separator and the second separator,
the first separator and the second separator each include:
a facing surface that faces the power generating unit; and
an opposite surface that is located on a side opposite to the facing surface,
the opposite surface of the first separator and the opposite surface of the second separator are each provided with groove passages that extend in a second direction, a cooling medium flowing through the groove passages,
the first separator of each single cell includes first protrusions that protrude toward the second separator of another single cell that is adjacent in the first direction, the first protrusions abutting the second separator,
the groove passages include groove passages that are located at outermost positions in a third direction, the third direction intersecting with both of the first direction and the second direction,
the first protrusions are provided on an outer side of at least one of the groove passages that are located at the outermost positions in the third direction, the first protrusions being arranged side by side in the second direction,
the second separator of each single cell includes second protrusions that abut the first protrusions of another single cell that is adjacent,
the second protrusions each protrude toward the corresponding one of the first protrusions in the first direction,
a distal end of each second protrusion includes a depression that is located at a center in the second direction and extends in the third direction,
a length of the depression in the second direction is greater than a length of the first protrusion in the second direction, and
a distal end of each first protrusion is located inside the depression.