Plug-in Hybrid Electric Vehicles Workshop
2009 IEEE EIT Conference
June 7-9, 2009
Holiday Inn Select™ Windsor Ontario Hotel
Windsor, Ontatio, Canada
Sunday, June 7, 2009
1:00 pm - 4:00 pm
Instructor: Chris Mi, PhD
Lithium-ion batteries are considered as the only viable energy storage
solution for the large deployment of plug-in hybrid electric vehicles (PHEV).
The main issues of lithium-ion batteries include capacity fade, cycle life, and safety.
The safety and longevity issues are significantly magnified in large battery systems
used in PHEV and renewable energy systems. Much of the work at the present time is
focused on battery chemistry and manufacturing process improvement. However, these
issues can be effectively addressed from the control and management perspective,
with a power electronics based solution. This presentation discusses the management
of lithium-ion battery systems aimed at improving battery life, available capacity,
battery safety and reliability in PHEV with power electronics based solutions.
The power electronics based solutions use isolated charge architecture to provide effective
and safe cell-balancing during charge with reduced charging time, and a dynamic balance
circuit during discharge to utilize all the cell energy available. Every cell tightly
balances during charge and discharge in any combination of rows, modules, arrays, or
strings of batteries. An effective thermal design and management are included to extend
battery life, along with health monitoring, fault detection and fault isolation.
Additional features of the system include conditioning vehicle system with a
bidirectional converter for cold weather performance improvement. A number of
fundamental issues were identified in the research, including dual phase-shift
control algorithm, model based predictive control that combines online load parameter
identification and dead-band compensation, and a framework for the research of short
timescale transients in high power converters.