This paper presents a recent advance in the development of innovative low cost maintenance free lead acid batteries for EV and HEV application with improved cycling life and performances by combining the compression concept, the use of porous additive and automotive battery mass manufacturing process. This study have shown the significant effect of the compression application on flexible module composed of automotive batteries thin plates stack slightly modified. Cycle number multiplication by close to ten of cycling life in aggressive conditions was obtained. The expansion of the active materials is limited suppressing the shedding phenomenon responsible to the dramatic capacity loss of the cell in such cycling conditions. The idea of using porous additives in the active materials in order to improve the capacity of the compressed cells has been validated giving active mass utilisation improvement by 30 %. This first results shows that lead acid battery with stabilized energy density of 50 Wh/kg should be reached in near future following this principle, keeping high power compatibility. These performances successfully validated on EV demonstrator should be interesting for the equipment of various low autonomy range EV and HEV. In partnership with CEAC-EXIDE, industrial works were undertaken at 2006 beginning for the purpose of industrial production. Process studies showed that this technology can be adapted to traditional SLI process and final products should be available at very competitive cost. First precommercial prototypes were built and tested confirming the technological breakthrough. New prototypes should be available for field tests at the end of 2006.
Innovative lead acid battery development for electric & hybrid vehicle applications
Innovative Bleiakkumulator-Entwicklung für Elektro- und Hybridfahrzeuge
2006
9 Seiten, 12 Bilder, 1 Tabelle, 13 Quellen
Conference paper
Storage medium
English
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