Patent ID: 7582377

Claim:
A method of assembling a fuel cell stack, comprising: classifying single cells, which are multiple single cells, in one of a first rank of first single cells and a second rank of second single cells; measuring a pressure loss in gas passages of each of the first and second single cells, wherein the pressure losses in the gas passages of the first single cells classified into the first rank are lower than the pressure losses in the gas passages of the second single cells classified into the second rank; subdividing the single cells of the first and second ranks to fall within a predetermined allowable tolerance/permissible range; the pressure losses in the gas passages of each first single cell in the first rank are substantially equal; the pressure losses in the gas passages of each second single cell in the second rank are substantially equal; selecting only the first single cells or the second single cells; and assembling the fuel cell stack with only the first single cells or the second single cells.