SUBSEA TECHNOLOGY
5 MWh Energy Storage System (ESS)
subsea applications and autonomous underwater vehicles (AUV) as well as remotely operated vehicle (ROV) manufacturers. The Li-ion battery systems range from standard common off the shelf (COTS) subsea to customised vehicle batteries with and without battery-management systems (BMS) and chargers. The advanced- precision titanium housing is fully customised and can be designed for full ocean depth. Subsea batteries for gas (LNG)
production, for example, allow high- performance for a design life of 25 years with the electronics and Li-ion cells meeting specifi c and meticulous safety standards. In these cases, the rechargeable Li-ion batteries provide robust subsea uninterruptible power supplies (UPS). They are perfect for marine and off shore technology applications, off ering next-level safety, reliability and availability. The company’s PowerPacks
automatically protect themselves via built in safety features. Some of the advantages of Li-ion batteries are the high current and standby operationality features, the ability to function at low to high temperatures and that they are able to cope with high currents/peaks. Furthermore, the corrosion-free titanium housings reduce OPEX costs down to almost zero and off er designs capable of operations in more than 6,000m depth. According to SubCTech’s CEO Stefan
Marx, the company’s Ocean Power unit off ers both standard batteries and bespoke solutions: “We are able to off er solutions that fi t our customers’ specifi cations and this is the service that has enabled our growth to date. Apart from advanced technology, trust from long-term relationships is key.”
SAFETY OF LI-ION BATTERIES Battery cells with SubCtech’s Li-ion technology off er huge advantages in terms of energy and power density in combination with safety, according to the company. However, all Li-ion or Li- pol cells are sensitive to overcharging, deep discharge and can be damaged by excessively high currents or temperatures. For safe operations and a long service life they need appropriate protection. Their special industrial cells already
have several built-in internal safety features: an overpressure valve, short- circuit protection, a steel housing and, in the case of the high-energy cells, a special temperature protection jacket around the electrodes. Although some of these properties may be found in ‘no-name cells’, only high-quality industrial cells off er the required failure rates of typically 1 in 10 million during their entire lifetime - the risk of failure according to FMEAs is extremely low. The battery is primarily divided
into safe battery modules. These can be scaled up and are monitored and controlled by a high-level controller battery-management system.
2 MWH RECORD- BREAKING ENERGY STORAGE SYSTEM (ESS) Many years ago, SubCtech recognised the ever-increasing demand for power and increasing capacity within the subsea sector for UPS, backup solutions or to support long tiebacks in brownfi elds. Its latest response is a new series of Li-ion batteries specifi cally aimed at large subsea energy storage facilities, vehicle propulsion and and the electrifi cation of energy production locations. The aim is to make global energy
supply more reliable while also minimising production down time. The resulting innovation is already
making waves across the industry, according to the company. The Subsea 2 MWh Energy Storage System (ESS), is fully qualifi ed according to API17F and is already reaching TRL 6. The storage system is now being deployed underwater for operational use.
For more information visit:
www.subCtech.com
www.engineerlive.com 51
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