About the FCX

  • Overview
  • Powertrain
  • FC Stack
  • Ultra Capacitor
  • Performance
  • Hydrogen Tank
  • Technical Specification

FC Stack

Powertrain Layout

Newly developed Honda FC Stack combines world-class levels of compactness and high output with operation at ambient temperatures as low as –20°C

Output Density
Alomatic electrolytic membrane and stamped metal separator used for the first time in an automotive application, for an evolutionary leap to the next generation in high-performance fuel cells

Honda developed an aromatic electrolytic membrane, which offers outstanding hydrogen ion permeability, and a stamped metal separator, for superb electrical and thermal conductivity—a world's first in an automotive application. By improving electrical generating efficiency and through efforts to reduce stack size, the new stack has double the output and is half the size of its predecessor, achieving output density that ranks among the best in the world. What's more, this enables operation in temperatures from –20°C to +95°C, and enhances durability. Production and recycling are also easier. These breakthroughs herald a new generation in fuel cell performance.

Power output volution (output ration*)
Compactness evolution (volume ratio*)
Lightness evolution (weight ratio*)
Use of stamped metal separators and a simplified construction make the Honda FC Stack lighter and more compact—for world-class output density

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.

Comparison of Honda FC Stack construction
Honda Stack installed in FCX-V3
Honda FC Stack
Modulization of the humidifier unit and unitization of other peripherals
for a more compact fuel cell system

In order to maximize space efficiency in the fuel cell system box, the FCX uses two FC stacks that is made lighter and more compact through the use of stamped metal separators. The resulting layout freedom is utilized to enable a unitized construction for the humidifier module. Structural components is combined and other peripherals unitized to create a highly efficient layout for the system, achieving a more compact fuel cell system box.

Fuel cell system box configuration
Improved productivity and recyclability

The stamped metal separators can be formed using ordinary metal stamping technology and feature unitized seals, resulting in major savings in production time. This results in improved productivity. And because metal is used, the unit is also easier to recycle, further improving the FC Stack's prospects for future large-scale commercialization.

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