Bidirectional PWM Converter Integrating Cell Voltage Equalizer Using Series-Resonant Voltage Multiplier for Series-Connected Energy Storage Cells

2015 ◽  
Vol 30 (6) ◽  
pp. 3077-3090 ◽  
Author(s):  
Masatoshi Uno ◽  
Akio Kukita
Keyword(s):  
Energy Storage ◽  
Cell Voltage ◽  
Pwm Converter ◽  
Voltage Multiplier ◽  
Series Resonant ◽  
Storage Cells

scholarly journals Cell Voltage Equalizer Using a Selective Voltage Multiplier with a Reduced Selection Switch Count for Series-Connected Energy Storage Cells

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1303 ◽  
Author(s):  
Masatoshi Uno ◽  
Teruhisa Ueno ◽  
Koji Yoshino
Keyword(s):  
Energy Storage ◽  
Standard Deviation ◽  
Cell Count ◽  
Lithium Ion Batteries ◽  
Electric Double Layer ◽  
Lithium Ion ◽  
Cell Voltage ◽  
Voltage Multiplier ◽  
Storage Cells ◽  
Double Layer Capacitors

Cell voltage equalization is mandatory to eliminate voltage imbalance of series-connected energy storage cells, such as lithium-ion batteries (LIBs) and electric double-layer capacitors (EDLCs), to ensure years of safe operations. Although a variety of cell equalizers using selection switches have been proposed, conventional techniques require numerous switches in proportion to the cell count and are prone to complexity. This paper proposes a novel cell voltage equalizer using a selective voltage multiplier. By embedding selection switches into the voltage multiplier-based cell voltage equalizer, the number of selection switches can be reduced in comparison with that in conventional topologies, realizing the simplified circuit. A prototype for twelve cells was built, and an equalization test using LIBs was performed. The voltage imbalance decreased down to approximately 20 mV by the proposed equalizer, and the standard deviation of cell voltages at the end of the equalization test was as low as 10 mV, demonstrating its equalization performance.

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