Patent ID: 6572995
Filing Date: 2003-06-03
Classification: H01M,Y02E

Abstract:
A fuel cell stack in which each fuel cell comprises:a first side edge and a second side edge opposite to said first side edge; a first end edge and a second end edge opposite to said first end edge; a fuel reactant gas inlet at said first end edge and adjacent said second side edge; a fuel reactant gas turnaround manifold extending across said second end edge; a first fuel reactant gas flow field adjacent said second side edge and extending from said fuel reactant gas inlet to said fuel reactant gas turnaround manifold; a fuel reactant gas outlet at said first end edge adjacent to said first side edge; a second fuel reactant gas flow field adjacent said first side edge extending from said fuel reactant gas turnaround manifold to said fuel reactant gas outlet; an oxidant reactant gas inlet at said first side edge adjacent said second end edge; an oxidant reactant gas turnaround manifold extending across said second side edge; a first oxidant reactant gas flow field extending from said oxidant reactant gas inlet to said oxidant reactant gas turnaround manifold; an oxidant reactant gas outlet on said first side edge adjacent said first end edge; a second oxidant reactant gas flow field extending from said oxidant reactant gas turnaround manifold to said oxidant reactant gas outlet, whereby said fuel reactant gas outlet is adjacent to said oxidant reactant gas outlet; a coolant inlet disposed adjacent said fuel reactant gas outlet and said oxidant reactant gas outlet; a coolant outlet disposed adjacent to a side of said fuel cell which is opposite to a side of said fuel cell to which said coolant inlet is adjacent; and a coolant flow field extending from said coolant inlet to said coolant outlet.