Teesing B.V, a Netherlands-based connectivity solutions provider, has been assigned several patents for its unique, filling technique for hydrogen (H2) refuelling.

In order to supply H2 at 700 bar, the company’s Pressurising Using Hydraulics (PUsH) system eliminates the need for pre-cooling by implementing a compressor, with the system filling fuel cell vehicles (FCVs) with both H2 and water.

The technology, which Teesing has been developing since 2009, has now been completed through to level TRL4 and is set to be validated in a relevant, undisclosed industrial application, according to the business.

The refuelling station design is equipped with a water pump which supplies water to a buffer in order to push out the H2 in the system. Consequently, H2 can either be compressed into the buffer or the buffer can be a mobile storage facility that can be filled at a relevant H2 factory.

Therefore, refuelling takes place in two stages; the pressurisation stage and then a water-H2 exchange stage. As both water and H2 flow into the vehicle tank, the pressure inside the tank rises while the pressure inside the buffer is reduced until both pressures are roughly equalised at around 700 bar.

Refuelling ends when a sensor measures H2 flowing back into the buffer as a result of the water-H2 exchange stage. The short video (below) explains the concept.

Source: Teesing B.V

The company claims this technology has a number of advantages including a faster filling time, lower investment and operating costs and improved safety benefits.

A press release stated, “For faster filling, the refuelling speed is maximised by equipping the fuel tanks with temperature sensors and restricting the H2 flow based on the measured temperature.”

“This project is very important for Teesing. It fits in the long-term strategy for the Alternative energy business unit. The protoypes have been successfully tested and patents have been issued for the PUsH principle in various countries.”

A demo setup of the PUsH system has been setup at the Tongji University in Shanghai, consisting of a hydraulic unit, pump, control panel, nozzle and receptacle, which have all been specifically designed for this concept.