New Battery Monitoring Unit for HEV/EV Lithium-ion Battery

Paper #:
  • 2011-01-1740

Published:
  • 2011-08-30
DOI:
  • 10.4271/2011-01-1740
Citation:
Kawase, J. and Maebara, T., "New Battery Monitoring Unit for HEV/EV Lithium-ion Battery," SAE Technical Paper 2011-01-1740, 2011, doi:10.4271/2011-01-1740.
Affiliated:
Pages:
6
Abstract:
Lithium-ion batteries have higher energy content and power density than Nickel-metal hydride (NiMH) batteries, but require carefully management for durability and safety. Unlike NiMH batteries, which are controlled on a battery unit basis, each lithium-ion cell generates a different voltage. Typically, the complex controllers required to equalize individual cell voltages are large and costly. We have developed a low-cost battery monitoring unit that performs the same function with a proprietary cell-voltage equalizing system. This new unit also offers various innovative technologies, such as detecting overcharge and over-discharge, fault diagnosis and the measurement of the batteries internal resistance to monitor degradation.
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