Abstract
The Advanced Lead Acid Battery Consortium (ALABC) has since 2000 been demonstrating valve-regulated lead-acid (VRLA) batteries in hybrid electric vehicles and has shown that advanced designs can cope with this duty cycle with good reliability (1). This demonstration work has been done by converting existing vehicles and thus all work to date has utilized Japanese mild hybrids. The European market is coming at hybridization from a different direction, with the introduction of low-cost micro-hybrid stop/start systems, such as the BMW EfficientDynamics (2), in order to meet CO2 regulations. Recently Controlled Power Technologies (CPT) has been promoting an alternative way of achieving mild hybrid performance (3), which would meet projected CO2 regulations, at a fraction of the cost of the current Japanese approach. This new system would operate with advanced VRLA batteries at 12V or 48V and provides an opportunity for lead-acid to be at the leading edge of hybrid technology.
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