Innovative Solutions For Small Battery Packages
- Paper number
IAC-07-B4.6.03
- Author
Mr. Carlo Del Vecchio Blanco, University of Naples "Federico II", Italy
- Coauthor
Mr. Fabrizio Boer, Italy
- Coauthor
Prof. Marco D'Errico, Seconda Universita di Napoli, Italy
- Coauthor
Mr. Paolo Galantini, Italy
- Year
2007
- Abstract
Modular autonomous architectures, consisting in autonomous modules opportunely integrated, allow to fulfill a wide range of requirements, reducing changes in subsystems design and introducing high platform scalability and reliability levels. In addition, considering the introduced internal autonomy, the on-board computer can be charged by system-level tasks only, allowing for new missions concepts, such as formations and/or self-adaptive platforms. The described architecture requires great attention to interface problems. In particular, considering mechanical and thermal problems, not only an optimization of the modules case mass is needed but an internal thermal control improvement is also required, in particular if COTS components are used. Following this approach, an advanced battery module has been integrated and used to test a new filler material, in order to evaluate the advantages achievable in thermal control and mass reduction. The module integrates six SAFT® Li-ion cells series connected for a 150Wh (6.8Ah SAFT® MP series 1.35Kg and 1.14dm3) configuration with 5A as maximum current supplied. Integrated battery power electronics is based on Linear Technology ICs: LTC4100 as charge controller, which allows for a charge current programmable through SMBus protocol, and LT3782 for discharge voltage regulation. Internal management is performed by a Microchip PIC18F258 and connection to the OBC is guaranteed by CAN bus. Module nominal overall efficiency is about 74BN100 is a new thermal conductive filler technology, based on compressed boron nitride particles ranging from 0.2 microns to 200 microns with the result to have a superior thermal conductivity (over 14W/mK), a low specific density (0.7g/dm3) and high dielectric constant. Due to the high compression level, the filler reduces the boards supports masses and vibrational environment. It can also be reworked because it is not polymerized. In order to evaluate the thermo-mechanical and electrical advantages in using the BN100 filler for space applications, starting from the results obtained by an ESA program has successfully been carried out and, for the configurations above, two battery case prototypes, with and without BN100, have been designed and a campaign including electrical characterization and thermal-vacuum tests has been planned. Moreover, considering the particular chemical composition, an evaluation of the radiation shielding properties of the boron nitride powder has been reported. TID tests have been planned considering a CO60 source, 10Krad as total dose and 1.5rad/s e 2rad/s as dose rate. An analysis on SEE test has also been conducted.
- Abstract document
- Manuscript document
IAC-07-B4.6.03.pdf (🔒 authorized access only).
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