Abstract
Due to the low cost, small size, and ease of control, the switched-capacitor (SC) battery equalizers are promising among active balancing methods. However, it is difficult to achieve the full cell equalization for the SC equalizers due to the inevitable voltage drops across Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) switches. Moreover, when the voltage gap among cells is larger, the balancing efficiency is lower, while the balancing speed becomes slower as the voltage gap gets smaller. In order to soften these downsides, this paper proposes a cell-to-cell battery equalization topology with zero-current switching (ZCS) and zero-voltage gap (ZVG) among cells based on three-resonant-state SC converters. Based on the conventional inductor-capacitor (LC) converter, an additional resonant path is built to release the charge of the capacitor into the inductor in each switching cycle, which lays the foundations for obtaining ZVG among cells, improves the balancing efficiency at a large voltage gap, and increases the balancing speed at a small voltage gap. A four-lithium-ion-cell prototype is applied to validate the theoretical analysis. Experiment results demonstrate that the proposed topology has good equalization performances with fast equalization, ZCS, and ZVG among cells.
Highlights
The world is being confronted with unprecedented crises, i.e., the depletion of fossil fuels and the global warming [1]
Energies gyrator to photovoltaic systems, demonstrating ultimate improvement in the power harvesting capability under different insolation levels. The objective of this is to of introduce an adjacent cell-to-cell battery equalization topology based on these works, thepaper objective this paper is to introduce an adjacent cell-to-cell battery equalization three-resonant-state
After about 8.2 h, the voltage gap between the cells is still larger than 0.109 V, which shows that the switched capacitor method cannot achieve zero-voltage gap (ZVG) between the two cells
Summary
The world is being confronted with unprecedented crises, i.e., the depletion of fossil fuels and the global warming [1]. Energies gyrator to photovoltaic systems, demonstrating ultimate improvement in the power harvesting capability under different insolation levels Based on these works, the objective of this is to of introduce an adjacent cell-to-cell battery equalization topology based on these works, thepaper objective this paper is to introduce an adjacent cell-to-cell battery equalization three-resonant-state. This parallel theisLC tank, which is hereinafter referred as the inductor-capacitor-switch structure obtains another resonant current resonant path to release thepath residual energy in the capacitor to converter This structure obtains another current to release thestored residual energy stored thethe inductor, which the foundations the bi-directional flow and weakens the in capacitor to thelays inductor, which lays to theachieve foundations to achieve thepower bi-directional power flow and couplingsthe of acouplings large voltage with low efficiency small voltage withvoltage slow balancing weakens of a gap large voltage gap with and lowaefficiency and gap a small gap withspeed
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