During the design of the ICTINEU 3 submersible a particular lack was detected if a really highly operational vehicle was to be achieved: the need for a more efficient and powerful battery system than those existing models based on lead-acid batteries. After reviewing the state of the art, in 2007, few alternatives were foreseen on battery systems suitable for manned submersibles. Lithium-ion-polymer cells showed as the most probable substitute for lead-acid cells. With a few experiences on the table and only a handful of providers in the market, yet Ictineu Submarins decided to develop its own pressure-tolerant battery system based on li-ion-polymer cells. After 5 years of research and development, a prototype system is going under final testing and certification process. It will be implemented in the manned submersible ICTINEU 3 and certified by GL. The system is based on modules that contain all elements needed for functioning and safety (cells, electronics, control, safety and protection devices and power switches for charge and discharge). Main facts of the battery system are: compactness, robustness, pressure tolerant up to 1200m, safe and certifiable modules; a total of 42 kWh, 150V, in only 480kg of weigh. A satisfactory weigh/power ratio of 11.4 kg for each kWh has been achieved for the complete system (i.e. battery plus necessary systems and container), while typical lead-acid systems provide a mean of 30kg/kWh.
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