To: P. Ramamoorthy who wrote (21029 ) 8/14/2000 10:41:01 AM From: ikonoklast53 Respond to of 27311 Ram, Yes, it is looking good. Hopefully we can get confrimation on other apps through more PO's soon. BTW, came across this and wonder if Alliant/ Valence is invoved with this Air Force project using Li-polymer in small satellites. Not sure about the date but appears to have been intiated this year. Regards, Garydtic.mil ----------------------------------------------------- Fuel Efficiency and Advanced Propulsion Technology DoD will benefit significantly from the development of fuel-efficient, low-emission power sources. This need is pervasive among all of the services due to the cost and logistics burden of providing fuel to combat forces. This initiative will focus on the efficient increase of speed and thrust, reducing fuel requirements, and reducing emissions. The driving forces for improved power and propulsion in the consumer sector are the same as for the military: increased density, enhanced safety, lower cost and environmental friendliness while still increasing power/energy density. The results of these initiatives will be directly applicable to both the military and commercial markets. ------------------------------------------------------------------------ 00-PR-02 TITLE: Integrated Layered Power Source For Space Based Radar OBJECTIVE: The objective of this effort is to fabricate an integrated layered power source composed of a rechargeable lithium polymer battery and a high efficiency solar cell. The TechSat21 initiative (ARFL/VS) has proposed a unique solution to the space based radar need composed of many small size satellites which communicate by forming a network which mimics a much larger single radar array. An enabling technology for this concept is a solar energy source sized to fit in the space and weight requirements. The concept proposed here would support TechSat21 and many other satellite concepts. The article to be developed consists of a solar cell packaged together with a battery and controller/thermal management forming a "sandwich" or layered single article that generates, stores, and distributes energy to the satellite. The solar cell required for this type of construct is now under development at AFRL/VS and is expected to deliver a 35% efficient cell which will significantly reduce the area needed for power generation. The technology to be investigated here, the lithium-polymer battery, would provide the energy storage medium and the structure for the unit. Based on experiments and analysis done to date, an energy density of 300 to 400 Wh/kg is attainable. In addition, the energy storage needs to function over a broad temperature range from -20 to +70 °C. Weight reductions and increased run times associated with the high energy density are attractive for reducing launch weight costs and extending mission capability. These features are highly desirable in commercial applications such as space satellite networks, electric vehicle applications, cellular phones and lap top computers. Low cost of manufacturing is as important as lightweight. DESCRIPTION: An integrated layered power source that is retractable offers flexibility in meeting varied power requirements. To accommodate small size and desired low cost, an easily manufactured concept that can be mass-produced must be developed. Strings of these layered cells would be packaged to unfold as the satellite deploys. The technology challenge will be to develop a very high energy density lithium polymer battery that can function over a broad temperature range and demonstrate low self-discharge rates consistent with mission requirements of ten to twenty years. The battery would be integrated with the solar cell from the AFRL/VS effort and electronics based on current high energy density DC/DC converters. The "payload" must be self-regulating (i.e., have its own charge control and thermal management) with bus power delivered by the network of interconnected layered power sources. ESTIMATED AFRL/PRP FUNDING CONTRIBUTION: $1.1M ESTIMATED PROGRAM DURATION: 36 months GOVT TPOC: Dr. Larry Scanlon PHONE: 937-255-7770 FAX: 937-656-7529