Improved Performance of Serially Connected Li-Ion Batteries With Active Cell Balancing in Electric Vehicles

This paper presents an active cell balancing method for lithium-ion battery stacks using a flyback dc/dc converter topology. The method is described in detail, and a simulation is performed to estimate the energy gain for ten serially connected cells during one discharging cycle. The simulation is v...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on vehicular technology 2011-07, Vol.60 (6), p.2448-2457
Main Authors: Einhorn, M., Roessler, W., Fleig, J.
Format: Article
Language:English
Subjects:
Applied sciences
Batteries
battery management systems
Charge
Circuit properties
Convertors
Current measurement
dc-dc power converters
Direct current
Direct energy conversion and energy accumulation
Discharge
Discharges
Electric potential
Electric vehicles
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical machines
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electronic circuits
Electronics
energy storage
Exact sciences and technology
Ground, air and sea transportation, marine construction
Mathematical models
Prototypes
Road transportation and traffic
Signal convertors
Simulation
Studies
Voltage
Voltage measurement
Windings
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper presents an active cell balancing method for lithium-ion battery stacks using a flyback dc/dc converter topology. The method is described in detail, and a simulation is performed to estimate the energy gain for ten serially connected cells during one discharging cycle. The simulation is validated with measurements on a balancing prototype with ten cells. It is then shown how the active balancing method with respect to the cell voltages can be improved using the capacity and the state of charge rather than the voltage as the balancing criterion. For both charging and discharging, an improvement in performance is gained when having the state of charge and the capacity of the cells as information. A battery stack with three single cells is modeled, and a realistic driving cycle is applied to compare the difference between both methods in terms of usable energy. Simulations are also validated with measurements.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2011.2153886