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Conventional stacks using carbon separators require independent seals, along with disk springs and backup plates held together with large bolts in order to maintain a tight seal. In comparison, the Honda FC Stack utilizes high-strength stamped metal separators that are 50% thinner than their carbon counterparts, and employs a unitized seal that results in an even thinner cell unit and fewer parts. What’s more, the design takes advantage of the springiness of the metal separators to create a simple structure in which the stack is simply encased in panels, reducing the number of parts by half. The result is a fuel cell stack that is lighter and more compact, for a high-output, high-efficiency unit that achieves world-class output density (ratio of output to volume and weight) more than twice that of previous fuel cell stacks.
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| Comparison of separator thickness |
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