| Abstrakt: |
Wireless communication is today considered as a disruptive technology. Indeed, even if wired systems can easily achieve 100% of reliability, it induces high amount of wiring, which has non negligible impact on the mass and so on the lifetime. In order to save time and planning, wireless communicating sensors appear as a wiring optimization, allowing rapid installation without modification of the general electrical network. But such systems need embedded energy. In order to demonstrate the validity of wireless technology concept adapted to various environments including the space and the aeronautic ones, the developments of miniature & autonomous Li-ion batteries are described in this paper. Their prototypes performances in space, aircraft flights, cold or corrosive environments or under mechanical strains conditions are discussed. They were designed taking into account environment constraints such as temperature (ca. -50degC to 150degC), gravity, vacuum or very low pressure and vibrations. New chemistries for higher energy density, above 250Wh/kg, new components for higher temperatures (close to 100degC) or low temperature operating electrolytes, below -20degC, are also introduced. Learning from this background on smart miniature autonomous systems in extreme conditions and new chemistries for higher autonomy, further developments for larger Li-ion batteries are already started in order to be integrated in air platforms. |
