Passive dissipation cell balance methods are predominantly used in the electrical vehicle industry to overcome inconsistency problem commonly existing in lithium ion cells in series. Some use active schemes with various intermediate storage elements to enhance cell balance efficiency. However, both active and passive balance methods suffer the setbacks of unavoidable cell overcharging or insufficient charges. The current study develops a two-staged balance scheme to compensate cell inconsistency without the shortcomings of existing balance methods. The two-staged balancing scheme uses an innovative switch matrix to select and equalise cell voltages in a lithium ion battery module. The developed balance module automatically selects the cell with the minimum voltage and raises the voltage of this cell with balance current until a preset voltage condition is reached. Then the system would continue to raise the next cell with the minimum voltage until any overcharged condition is reached in any cell. The system would turn to the second charging stage, charging each cell with a constant voltage mode until a preset voltage level is reached. The second charging stage charges each cell until each cell reaches fully charged state while no single cell would be overcharged by any chance. Tests showed that the developed two-staged balance method was capable of overcoming cell inconsistency problem and charging each cell to full states without any chance of overcharging.
Development of a two-staged balancing scheme for charging lithium iron cells in series
IET Electrical Systems in Transportation ; 6 , 3 ; 145-152
2016-09-01
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
secondary cells , innovative switch matrix , lithium ion battery module , cell balance efficiency enhancement , active balance method , cell inconsistency compensation , battery management systems , battery powered vehicles , lithium ion cell charging , constant voltage mode , compensation , matrix algebra , two-staged balancing scheme , intermediate storage element , electrical vehicle industry , passive dissipation cell balance method , preset voltage level , overcharged condition
Metadata by IET is licensed under CC BY 3.0
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