Patent ID: 11929525
Assignee: HONDA MOTOR CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A fuel cell stack includes a plurality of power generation cells stacked one another, each of the power generation cells including a membrane electrode assembly and a pair of separators sandwiching the membrane electrode assembly, comprising:
a coolant flow field formed between protruded portions of the separators adjacent to each other;
a coolant supply passage allowing a coolant to flow into the coolant flow field; and
a coolant discharge passage allowing the coolant to flow out of the coolant flow field,
wherein the coolant flow field includes:
a cooling flow path for cooling a power generating portion of the membrane electrode assembly, the cooling flow path containing a portion overlapping the power generating portion of the membrane electrode assembly,
a bypass flow path provided on outer peripheries of the separators, the bypass flow path being formed inside protruded portions of flow field seals for sealing reactant gas flow fields formed between the separators and the membrane electrode assembly,
a main supply flow path extending from a portion of the coolant supply passage on a side of the cooling flow path for cooling the power generating portion, intersecting the bypass flow path and further extending toward the cooling flow path for cooling the power generating portion, the main supply flow path connecting the coolant supply passage and the cooling flow path for cooling the power generating portion, and
a bubble release flow path extending from an upper portion of the coolant supply passage in a gravity direction toward the bypass flow path and connected to the bypass flow path.