Interconnector for a fuel cell stack and method for production

Simple SummaryContent extracted from patent full text and abstract with AI.

This patent describes an interconnector for use in fuel cell stacks, especially high-temperature fuel cells, made from ferritic chromium steel coated with a copper-containing layer. This copper layer prevents unwanted diffusion between the steel and other components, such as nickel-rich contact materials, thereby extending the interconnector’s lifespan and improving electrical conductivity. The invention also includes an optional chromium-containing oxide barrier and outlines different manufacturing methods for applying these protective layers.

Use CasesContent extracted from patent full text and abstract with AI.

• Fuel cell stacks in stationary power generation systems
• High-temperature fuel cells for automotive applications (e.g., fuel-cell vehicles)
• Portable fuel cell power units
• Industrial power backup systems using fuel cells
• Micro-CHP (combined heat and power) systems utilizing fuel cells
• Any electrochemical cell assembly requiring robust, long-lived electrical interconnects

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly extended service life of the interconnector, reducing maintenance and replacement costs.
• Improved electrical conductivity due to clean, oxide-free contacts.
• Prevention of chemical degradation and diffusion issues between steel and nickel, keeping both the interconnector and connected materials in optimal condition.
• Reduced risk of mechanical failure (e.g., cracking) from thermal stress due to stabilized material properties of the interconnector.
• Better suitability for use in compact and mobile fuel cell stacks due to improved durability and electrical performance.
• Scalable and compatible with conventional coating technologies for economic and flexible production.

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

An interconnector is made of ferritic chromium steel, on which a cupriferous layer is disposed. This layer prevents interdiffusion between the chromium steel and additional components with which the interconnector has direct contact. According to the state of the art, such diffusion occurs particularly if these additional components contain nickel. In addition, the interconnector may comprise a chromium-containing oxide layer as a barrier against interdiffusion. For this purpose, the interconnector steel can also be preoxidized before applying the cupriferous layer. The interconnector has a significantly longer service life than interconnectors according to the state of the art, and it has improved electrical conductivity because the electrical contact surface thereof is free of oxides and has high transverse conductivity.