Saft Li-Ion Batteries to Power SEAL Delivery Vehicles
17 May 2007
Cockeysville, Maryland – Saft was recently awarded a $1.4 million contract to improve the existing battery system for the SEAL Delivery Vehicle (SDV). The contract was awarded as part of the Defense Acquisition Challenge (DAC) programme, which provides funding for the test and evaluation of technologies to improve current systems.
The United States Special Operations Command (USSOCOM), and the Crane division of the Naval Surface Warfare Center (NSWC Crane), selected Saft's lithium ion (Li-ion) technology in a full and open competition to replace the current silver zinc (AgZn) battery system over two years ago. Under that contract, Saft developed the lithium ion prototype to replace the AgZn battery. This sole-source contract means Saft has been able to develop that prototype into a full-production battery.
DAC PROGRAMME
The DAC measures technology by certain criteria, including improvements in performance, affordability and advanced capabilities. The programme also looks for technology that can be rapidly implemented into existing defence systems at an affordable cost.
"Saft is eager to participate in the DAC programme to upgrade the existing advanced system prototype for the SDV," said Jim Miller, general manager of Saft's space and defence division (based in Cockeysville, Maryland). "This project will further our relationship with NSWC Crane and our commitment to providing the US military with the most advanced technological solutions available."
SEAL DELIVERY VEHICLES
SEAL delivery vehicles are underwater submersibles that transport navy SEALs and their equipment on long-distance missions. The SDVs take the SEALs from an offshore point to a point closer to shore where the SEALs will evacuate the vehicle and swim to land. During some missions, SEALs will remain in the SDVs for the duration of the mission.
HIGH-ENERGY LI-ION BATTERY SYSTEM
The navy needed a new system that allowed the SDVs to increase covert range and state of charge, and provide charge-in-place capability. With increased longevity, easier and shorter rechargeable procedures, and minimal maintenance needs, Saft's Li-ion series proved to be a perfect fit. Additionally, Saft's Li-ion technology lowers overall cycle costs and provides service life 17 times longer than the existing AgZn technology.
Saft developed a high-energy, Li-ion system to meet the demands of these vehicles. The system utilises two separate batteries that act as the sole power-source for the SDV. One battery provides 185V to power all vehicle propulsions, coupled with a 35V battery responsible for the vehicle's electronic systems. The combination of these two batteries ensures NSWC Crane's energy goal for the system is exceeded.
