Patent ID: 8142952

Claim:
A fuel cell battery system which operates a fuel cell battery in a state where a channel of a fuel off-gas is closed, comprising: a fuel cell battery that includes a plurality of cells stacked and in-series connected, a supply manifold that distributes a fuel gas to each of the cells, and a discharge manifold into which the fuel off-gas is discharged from each of the cells, wherein each of the cells is provided with a cell channel located between the supply manifold and the discharge manifold, and the plurality of cells include a first cell having a first cell channel inlet connecting the supply manifold and the cell channel of the first cell and at least one second cell having a second cell channel inlet connecting the supply manifold and the cell channel of the at least one second cell, the first cell channel inlet having a volume V 1 and the second cell channel inlet having a volume V 2 greater than V 1 , and wherein the volume V 1 is determined so that a relationship of r<nR holds, where r is the gas channel resistance of a cell having a gas channel resistance greatest among the at least one second cell, and R is a value obtained by combining the gas channel resistances of the first cell and the at least one second cell, and n is a total number of the plurality of cells (n is an integer of 2 or greater).