Patent ID: 7846608

Claim:
A fuel cell stack, comprising: a flow-field plate, comprising a center hole formed at the center of the flow-field plate; an inlet and an outlet formed on two positions near the outer edge of the flow-field plate; and flow grooves extending radially in a linear radial form from the center hole to approximately the outer edge of the flow-field plate on one side of the flow-field plate, wherein the fuel cell stack further comprises end plates, current conducting plates, membrane electrode and seal members; a center hole is formed at the center of each one of the end plates, current conducting plates and membrane electrode; each one of the end plate, current conducting plate and membrane electrode comprises an inlet respectively corresponding to the inlet in the flow-field plate, and also comprises an outlet respectively corresponding to the outlet in the flow-field plate; the seal members are provided around the inlet and outlet on the side of the flow-field plate having flow grooves extending radially from the center hole, and around the center hole and the outer edge of the flow-field plate on the other side of the flow-field plate respectively.