This project aims to investigate and enhance performance of a larger Proton Exchange Membrane (PEM) fuel cell system, capable of reaching +250 kW through the implementation of a novel single fuel cell stack platform. The endeavour involves upscaling the fuel cell stack performance by implementing several innovative steps based on EH Group’s patented technology, reinventing the MPL/GDL structure and optimising performance and dimensioning of the balance-of-plant components (such as humidifiers and compressors). The new and innovative approach on MPL/GDL development (MPL = Microporous layer, GDL = Gas diffusion layer) assists in reduction of cell thickness, resistivity, improvement of gas flow and performance of the stack. This approach leads to a more compact, efficient, scalable, and cost-effective fuel cell system, eliminating the duplication of fuel cell stack and a few of the balance-of-plant components. The resulting fuel cell building block demonstrates suitability for diverse applications, ranging from mobility solutions like trucks and trains to substantial power backup for data centres or energy storage.
The MPL/GDL development involves
- Two types of uniform MPL/GDL layers for PEMFC have been developed.
- Improved structures are investigated in detail and compared to conventional materials.
- MPL/GDL Type I shows good electrical conductivity, low contact resistance, high porosity, and average thickness
- MPL/GDL Type II displays uniform pores and better apparent electrical conductivity, permeability, and diffusivity than existing manufactured material.
- Both types of developed MPL/GDL can improve mass transport, reduce ohmic losses, and achieve better water management.
The newly proposed innovation on MPL/GDL development and the stack design could be an optimal way for the industry to adapt. That includes development of larger stack platforms, faster production, higher reliability and better performance and lifetime.
Furthermore, the stack box design adheres to the IEC 62282 product standard, ensuring compliance with various applications such as maritime, aviation and stationary application requirements. It exhibits inclination oscillation capabilities up to ±30 degrees, both statically and in dynamic reciprocating scenarios. The stack box is designed to withstand vibrations up to 5g and shocks up to 10g. Moreover, it provides protection against water and dust ingress in accordance with IP67 norms and complies with EMC requirements for immunity and emissions. Also, it incorporates internal ventilation, with vents strategically placed outside the box, addressing concerns related to potential hydrogen release or accumulation within the enclosure. This design meets various standards, including fire and explosion requirements and the UL94 flammability standard.
As a result of this valuable collaboration with SFOE, we have developed a novel GDL/MPL that can be integrated into stack development for better performance. The new design and approach can be integrated in the next generation of production machinery that accelerate the deployment of EH Group fuel cell products to decarbonise large stationary power, aviation, and marine applications.