Infrastructure

The area of “infrastructure” covers both the charging infrastructure (high power charging) for battery-powered vehicles and hydrogen filling stations for fuel cell vehicles.

Our products are already in use in many of these applications. This includes cooling solutions for charging cables and power electronics, hydrogen pressure sensors, hydrogen filtration, technical cleanliness and hydraulic drive units for high-pressure compressors.

Components and systems for quick charging stations

To shorten the charging times of electric vehicles, many vehicle manufacturers use so-called high power charging (HPC), which makes it possible for batteries to be charged in a matter of minutes with charging rates of 350 kW and more.

 

In the long term, the charging time of battery-powered electric vehicles should be comparable to the filling time of a combustion vehicle, above all to ensure the vehicle’s capacity for long-distance driving. The aim is to realise a range of 100 km in three minutes of charging.

Because of the high charging currents, the cable resistance in the charging cable and the charging connector cause a large amount of heat to be generated. To keep temperatures within the permitted range during charging, the charging cable and connector are cooled with a fluid. As the cooling systems needed for this are often integrated directly into the charging station, they need to be especially powerful and compact.

Cooling systems for cooling charging cables in quick charging stations (HPC)

The fluid can be cooled either with ambient air or alternatively with a cooling compressor, depending on the environmental and operating conditions.

In addition to conventional cooling media such as water glycol, systems with insulation oils or non-conductive fluids can be used. HYDAC is one of the leading suppliers of cooling system solutions for charging infrastructure and can provide the perfect solution for your application!

Air cooling

Chiller

Liquid cold plate

To supply high power charging parks with the power they need, high-performance frequency converters are required that can convert the alternating current provided by the power grid into direct current for the individual charging points. Furthermore, stationary battery storage is set up in some charging parks to stabilise and ease the strain on the power grid. Heat is also generated here, from losses in the power modules/battery cells, and this heat can be dissipated by means of fluid cold plates used in conjunction with a cooling system. For information on the products, see the section Components and systems for battery storage.

Components and systems for hydrogen filling stations

Hydrogen will play a major role in future in an energy system that is increasingly reliant on renewable energy. And this includes the mobility sector. While battery-powered vehicles can be used for a large percentage of day-to-day urban and commuter transport, it makes sense to use fuel cell vehicles, with their larger ranges and short filling times, in long-distance and cross-border transport, especially in larger vehicles (lorries, trains and ships). Over the past 20 years, globally applicable standards have been developed in this regard that make it possible to fill vehicles with 350 or 700 bar.

HYDAC equipped the first hydrogen filling station with hydraulic components back in 2006. We have since become a leading manufacturer of hydraulic drive units for a wide range of compressors that are responsible for providing the required system pressure to hydrogen filling stations.

In hydrogen-powered vehicles, the cleanliness and quality of the hydrogen is of great importance. When the vehicles are filled, the hydrogen supplied by the filling stations must be as clean as possible, with no contamination. As an expert in technical cleanliness, we have developed the world’s first analysis equipment that can be used to verify and analyse the particulate impurities under standard SAE conditions – the HYDAC PSA H70.

Experience with the PSA H70 has shown that effective and robust gas filtration that is able to handle the strict requirements of hydrogen filling is essential. With their combination of optimum housing design and innovative filter element technology, the HYDAC filter and separator solutions meet the strictest standards for all fields of application up to 1,000 bar and thus significantly contribute to the technical cleanliness of hydrogen filling stations.

HYDAC now supplies a wide range of components for the hydrogen filling station industry. This includes specially developed pressure sensors with ATEX and IECEX certification as a single or redundant version (SIL2-compliant) up to 1,050 bar. Furthermore, we supply cooling systems for recooling the heat generated by the compression of the hydrogen and compressor cooling units for setting the gas precooling temperature.

Technical cleanliness in hydrogen

PSA H70: measuring adapter for determining the particulate contamination in 700 bar and 350 bar hydrogen filling stations. Quantitative and qualitative measurement of contaminant particles >5 µm. Sampling compliant with ASTM D7650. Subsequent particle analysis according to ASTM D7651.

Particle filters and fluid separators for hydrogen

With the GF/GCF high-pressure filters, HYDAC is offering the leading technology for filtering gases in hydrogen applications up to 1,050 bar. The design of the filters provides maximum filter area in the most compact dimensions and is noted for excellent process stability, top quality permeate and minimal pressure loss. The Chemicron® filter material developed by HYDAC exclusively for gas applications provides defined separation rates with maximum filter integrity. The stainless steel filter elements are manufactured entirely without the use of resins which means they can be used at extreme temperatures and with particularly aggressive media. On account of the extremely robust and resistant technology, the differential pressure stability and resistance to pressure surges are excellent.

Pressure sensors for hydrogen

With over 30 years of experience in developing and producing pressure sensors, HYDAC Electronic has established a new series of hydrogen pressure sensors on the market. Thanks to HYDAC’s in-house manufacture of the pressure measurement cell, it was possible to develop a hydrogen cell based on stainless steel. The sensors are based on a robust, long-life sensor cell with a thin-film strain gauge on a stainless steel membrane. The sensor cell is welded to the process connection – there are no internal seals. The compatibility with hydrogen is ensured by using a particular material. The pressure sensors are now used worldwide in fuel cell vehicles (with EC79/2009 certification) and stationary applications (ATEX, IECEX, CSAUS).

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