Patent ID: 8012639

Claim:
A fuel cell stack comprising: a stack body including: an end power generation cell; a plurality of first power generation cells; and a coolant passage extending through the fuel cell stack in a stacking direction, the plurality of first power generation cells being stacked in the stacking direction, and the end power generation cell being provided at a first end of the stack body in the stacking direction, wherein each first power generation cell comprises: an electrolyte electrode assembly, said electrolyte electrode assembly including a pair of electrodes and an electrolyte interposed between said electrodes; separators sandwiching said electrolyte electrode assembly; a coolant flow field being formed at least at one position between said first power generation cells for allowing a coolant to flow in a direction parallel to a power generation surface; and a channel connecting said coolant passage through a first buffer to said coolant flow field for supplying the coolant to, or discharging the coolant from said coolant flow field, and wherein the end power generation cell includes: an end coolant flow field formed on an outside of said end power generation cell for allowing the coolant to flow in a direction parallel to the power generation surface, where a number of flow grooves in the end coolant flow field of the end power generation cell is the same as a number of flow grooves in the coolant flow field of each first power generation cell, and where the end power generation cell is configured such that the flow rate of the coolant in said end coolant flow field is smaller than the flow rate of the coolant in said coolant flow field of each first power generation cell; and an end channel connecting said coolant passage through a second buffer to said end coolant flow field for supplying the coolant to, or discharging the coolant from said end coolant flow field where a number of flow grooves of said end channel is smaller than the number of flow grooves of the channel of each first power generation cell.