New Positive Plate for Application of the UltraBatteryTM in Low-Voltage Hybrids
Reducing greenhouse gas emissions and fossil fuel consumption from the transport sector is a major problem for governments worldwide. In Europe, for example, various governments demand automakers to decrease CO2 emissions from current value of about 140 g for every 1 km driven to 95 g by 2020 and this is expected to decrease further to 75 g per km by 2025. With such requirements, low-voltage hybrids, which feature idling–stop and regenerative braking, have become the main stream. This is because, as for conventional vehicles, low-voltage hybrids have only one 12-V lead–acid battery. Nevertheless, there are great differences in the service conditions for the battery between these two types of vehicle. Low-voltage hybrids require the battery to provide additional energy to the on-board electronic devices during idling–stop and power for starting the engine as well as to receive power from regenerative braking. Thus, the factors that could hold back the uptake of low-voltage hybrids are the performance and cost of the energy-storage device. The 12-V flooded version of the UltraBatteryTM, a combined lead–acid and supercapacitor hybrid energy-storage device, has excellent high-rate, partial state-of-charge (HRPSoC) durability, excellent dynamic-charge acceptance, and lower water loss. A report will be given of the test results for the UltraBattery using new positive plate.
Yusuke Ogino holds a Bachelor of Engineering and a Master of Engineering from the Iwate University in Japan. He joined the Furukawa Battery in 2010 to conduct the research and development of the UltraBatteryTM for smart grid applications. In more recent years, he has commercialized the UltraBatteryTM for micro-HEV and EFB service.