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An introduction to A Novel Cell Equalizer Topology for Plug-In Hybrid Electric Vehicle Energy Storage System. Kun Zhuge [email protected] Overview. Significance of Cell Equalization Battery Model Novel Topology Analysis Simulation Result Conclusion. Significance of Cell Equalization.

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An introduction toA Novel Cell Equalizer Topology for Plug-In Hybrid Electric Vehicle Energy Storage System

Kun Zhuge

[email protected]

overview
Overview
  • Significance of Cell Equalization
  • Battery Model
  • Novel Topology Analysis
  • Simulation Result
  • Conclusion
significance of cell equalization
Significance of Cell Equalization
  • A battery of a plug-in hybrid electric vehicle (PHEV) consists of a long string of cells (typically 100 cells, about 360V)
  • Cost: 500$/KW for a typical 16KWh battery, which can provide about 80KM in urban area, surcharge of $5000
  • Cycle life and calendar life:
    • 500 cycles of 80% the capacity
    • Expecting 6000-7000 cycles for future PHEV
  • Safety:
    • Safety improvement of the system if there is continuously monitoring the cell current, voltage and temperature
battery model
Battery Model

[1]. Accurate Electrical Battery Model Capable of Predicting Runtime and I-V Performance, Min Chen, Student Member, IEEE, and Gabriel A. Rinc´on-Mora, Senior Member, IEEE, IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 21, NO. 2, JUNE 2006

cell equalization topology
Cell Equalization Topology
  • Current Ieq will flow in or out of the battery through the inductor
  • “Control” of the system monitors the battery voltage and responses to equalize the battery voltage by turning on or off the switches
cell equalization topology1
Cell Equalization Topology
  • Optimal choice: One equalizer unit is limited to four to five cells
    • Low cost constraint
    • Voltage margin to improve the reliability
voc estimation
VOC estimation

Ieq: equalizing current, active only at To and interrupted after T1

: is one at To and zero thereafter

: is the battery pack current

/ : are the dynamic resistances

/ : are constants

conclusion
Conclusion
  • In summary, the feasibility of the novel battery cell equalizer was explored
  • Cell equalization does contribution to battery cost, battery life and cycle, and battery safety
reference
Reference
  • [1]. Accurate Electrical Battery Model Capable of Predicting Runtime and I-V Performance, Min Chen, Student Member, IEEE, and Gabriel A. Rinc´on-Mora, Senior Member, IEEE, IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 21, NO. 2, JUNE 2006
  • [2]. Feasibility Analysis of a Novel Cell Equalizer Topology for Plug-in Hybrid Electric Vehicle Energy-Storage System, Pablo A. Cassani, Student Member, IEEE, and Sheldon S. Williamson, Member, IEEE, IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 58, NO. 8, OCTOBER 2009
  • [3]. Design, Testing, and Validation of a Simplified Control Scheme for a Novel Plug-In Hybrid Electric Vehicle Battery Cell Equalizer, Pablo A. Cassani, Student Member, IEEE, and Sheldon S. Williamson, Member, IEEE, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 57, NO. 12, DECEMBER 2010
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