Battery systems represent a new technology component in the power solution for short sea shipping with attractive properties producing a set of benefits. However, the safety of battery-powered ships must be ensured.
One critical aspect is the ability to deliver, at any time during operations, the power demand for safe and reliable propulsion, manoeuvring and operation. Failure to do so could result in a serious accident, such as a collision or grounding. It is therefore paramount that the available energy stored in onboard batteries can be reliably estimated and predicted at any given time.
Currently, battery powered ships are required by Class to carry out an annual capacity test. This is time consuming, requires the vessel to be taken out of service for a day and is associated with large uncertainties.
Real-time modelling and monitoring methodology
DNV is partnering with Fraunhofer ISE, Corvus Energy and Carnival Maritime on the DDD BATMAN (Data-Driven Degradation monitoring and prediction of BATteries for Maritime ApplicatioNs) project which explores alternatives by developing data-driven methods for diagnostics of battery systems and to provide means for verifying the State of Health (SoH) based on real-time sensor measurements.
Operational data is needed, and this will be collected in the project from ships in operation, and reliable and secure strategies for data collection, storage and sharing will be addressed. Moreover, additional insight will be obtained from laboratory testing under variable conditions. The focus will be on aspects related to battery systems for cruise ships, including battery lifetimes, replacement strategies, life cycle assessment and shore connection procedures.
The three-year project has been awarded MarTERA funding and is due to deliver its findings in 2023.