Our SFEERs are spherical Type IV high-pressure cells with a diameter of only about 11 cm.They store gaseous hydrogen safely and efficiently while withstanding extreme pressures of up to 1,000 bar. The form distributes pressure optimally and reduces component stress compared to cylinder geometries with lower stress levels. Material requirements are reduced without compromising safety.

Main elements of a SFEER are:

• A plastic liner containing the gas

• An aluminium connection for secure integration into the system

• A high-strength carbon fibre shell to take in compressive forces

Our system concept is based on safety: many small pressure cells instead of one large container. Our high-pressure SFEERs are connected to a low-pressure system (approx. 10 bar) which, under normal operating conditions, contains only a few grams of hydrogen. Only when hydrogen from the low-pressure range is consumed, hydrogen is replenished with the help of the microchips (#IMVS) integrated into each high-pressure SFEER. The MEMS-Chip controls the gas flow of each SFEER in a simultaneous way and therefore creates a swarm intelligence with that all different hydrogen storage tanks work together like one big tank. This means that safety functions multiply with each additional cell!

Cost-saving factors are obvious:

• High energy densities in the module: ~4,5 kWh/kg and ~1 kWh/L

• 50% less carbon fibre compared to 700 bar standard technology > less mass, less costs!

• Each cell operates independently, without electricity or communication