French naval defense systems group DCNS recently said it is investigating the integration of new-generation Lithium-ion (Li-ion) batteries with SCORPENE submarines, a concept that promises to double submerged endurance.
DCNS presented the concept at the Undersea Defence Technology Pacific 2008 show in Sydney, Australia, last week.
Current-generation diesel-electric submarines use lead-acid batteries, DCNS said. To further improve the performance capabilities of its SCORPENE range, DCNS has been working on the integration of new-generation Li-ion batteries.
This new technology promises to double submerged endurance at high speed while at the same time reducing the indiscretion rate, increasing range, improving safety and requiring less maintenance, all essential criteria for submariners, DCNS added.
The SCORPENE design is compatible with both Li-ion batteries and the MESMA air-independent propulsion system (AIP). MESMA alone enables a SCORPENE to patrol at low speed for three weeks at a time without broaching the surface.
To achieve this breakthrough, DCNS has been working in close cooperation with Saft, a world leader in the design, development and production of high-technology batteries.
Saft assembles Li-ion cells to form battery modules and modules into a battery system, complete with the necessary control electronics and software, to power a submarine in complete safety, DCNS said.
According to the company, the Li-ion cells developed by Saft for this application are similar to those used on satellites and have already proven their long lifetime. Saft is also a major supplier of Li-ion batteries for both manned and unmanned underwater vehicles.