Fuel Cell System

摘要

A fuel cell system has a plurality of individual fuel cells which are combined into a stack, where each of the individual fuel cells has a substantially planar membrane-electrode unit, two gas diffusion layers in the form of a fiber structure and of a bipolar plate, which establishes the electrical connection to the adjacent individual fuel cell that is located above or below. The gas diffusion layers adjoin the larger surfaces of the membrane electrode unit, which are located opposite of one another, and the bipolar plate comprises an active region surrounded by an edge region. In addition, the bipolar plates in the active region have a completely flat design so that the gas-carrying region is formed exclusively by the gas diffusion layers, what amounts to at least 60% of the height of an individual fuel cell.

主权项

1. A fuel cell system with a plurality of single fuel cells which are combined to form a stack, wherein each of the plurality of single fuel cells comprises:
a substantially planar membrane-electrode assembly; two gas diffusion layers in the form of a fibrous structure, wherein the gas diffusion layers are configured to adjoin larger surfaces opposite from one another of the membrane-electrode assembly; and a bipolar plate configured to establish an electrical connection with an adjacent one of the plurality of single fuel cells lying thereover or thereunder and having an active region surrounded by a peripheral region, wherein the bipolar plate is made completely planar in the active region such that a gas-carrying region is formed exclusively by the two gas diffusion layers, which makes up at least 60% of the height of a single fuel cell.