The alkaline aluminium/hydrogen peroxide power source in the Hugin II unmanned underwater vehicle

摘要

ln 1993, The Norwegian Defence Research Establishment (FFI) demonstrated AUV-Demo, an unmanned (untethered) underwater vehicle (UUV), powered by a magnesium/dissolved oxygen seawater battery (SWB). This technology showed that an underwater range of at least l000 nautical miles at a speed of 4 knots was possible, but also that the maximum hotel load this battery system could support was very limited. Most applications for UUV technology need more power over a shorter period of time. Seabed mapping using a multibeam echo sounder mounted on an UUV was identified as a viable application and the Hugin project was started in l995 in cooperation with Norwegian industry. For this application, an endurance of 36 h at 4 k-nots was required. Development of the UUV hull and electronics system resulted in the UUV Hugin I. lt carries a Ni/Cd battery of 3 kW h, allowing up to 6 h under-water endurance. ln parallel, we developed a battery based on a combination of alkaline Al/air and SWB technology, using a circulating alkaline electrolyte, alundnium anodes and maintaining the oxidant concentration in the electrolyte by continuously adding hydrogen peroxide (HP) to the electrolyte. This concept resulted in a safe battery, working at ambient pressure (balanced) and with sufficient power and energy density to allow the UUV Hugin lI to make a number of successive dives, each of up to 36 h duration and with only l h deck time between dives for HP refill and electrolyte exchange. After l00 h, an exchange of anodes takes place. The power source consists of a four-cell Al/HP battery, a DC/DC converter delivering 600 W at 30 V, circulation and dosing pumps and a battery control unit. Hugin lI is now in routine use by the Norwegian Underwater intervention AS (NUI) which operates the UUV fOr high-precision seabed mapping down to a water depth of 600 m.