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An introduction to A Novel Cell Equalizer Topology for Plug-In Hybrid Electric Vehicle Energy Storage System. Kun Zhuge kzhuge@uwaterloo.ca. 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 kzhuge@uwaterloo.ca
Overview • Significance of Cell Equalization • Battery Model • Novel Topology Analysis • Simulation Result • Conclusion
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 [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 • 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 Topology • Optimal choice: One equalizer unit is limited to four to five cells • Low cost constraint • Voltage margin to improve the reliability
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 • 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 • [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