State-of-Charge Determination From EMF Voltage Estimation: Using Impedance, Terminal Voltage, and Current for Lead-Acid and Lithium-Ion Batteries

Coleman, Michael; Lee, Chi Kwan; Zhu, Chunbo; Hurley, W.G.

doi:10.1109/tie.2007.899926

Cited by 387 publications

(163 citation statements)

References 20 publications

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“…was the time when each device started and when each device's battery reached the calculated final voltage. The information about the electric charge of the battery [19] was measured using a remotely controlled multimeter connected by USB. The experimental setup can be seen in Figure 4.…”

Section: Data Collectionmentioning

confidence: 99%

Towards a Wireless and Low-Power Infrastructure for Representing Information Based on E-Paper Displays

et al. 2017

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There has been much interest in replacing traditional information supports with more technological solutions in recent years. New technologies which allow paper-like perception with minimal power needs have emerged as low-power wireless scenarios. A priority for these new supports is to create the architecture for a scalable solution which maintains minimal power requirements. The retail industry demands a new information infrastructure that improves customer and employee satisfaction. In this work, authors propose an information provision architecture based on E-Paper and carry out an experiment where different smart labeling architectures based on Paper, E-Paper, LED liquid crystal display (LCD) and Dot-matrix LCD were tested in order to determine which is best suited for a real labeling environment. Enclosed in a research project called SMARKET, the authors pilot-tested the work in a real supermarket, having the opportunity to survey employees and customers about satisfaction and frustration with the use of the architectures proposed in this research work.

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Section: Data Collectionmentioning

confidence: 99%

Towards a Wireless and Low-Power Infrastructure for Representing Information Based on E-Paper Displays

et al. 2017

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“…The electrochemical reaction inside batteries is very complicated and hard to model electrically in a reasonably accurate way. So far, the state-of-the-art SOC accuracy for electric vehicle/plug-in hybrid EV (EV/PHEV) applications is in the range of 5%-10% [30]- [33]. Traditionally, full-wave diode bridge or thyristor converters were employed to synthesize dc voltage from the ac grid.…”

Section: Soc Estimationmentioning

confidence: 99%

A high-efficiency grid-tie battery energy storage system

Qian

Zhang

Lai

et al. 2011

IEEE Trans. Power Electron.

297

108

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Keywords: Microgrid, lithium-ion battery, battery energy storage system, battery management system, bidirectional ac-dc converter, inverter mode, rectifier mode Copyright 2011, Hao Qian A High-Efficiency Grid-Tie Battery Energy Storage SystemHao Qian ABSTRACT Lithium-ion based battery energy storage system has become one of the most popular forms of energy storage system for its high charge and discharge efficiency and high energy density. This dissertation proposes a high-efficiency grid-tie lithium-ion battery based energy storage system, which consists of a LiFePO4 battery based energy storage and associated battery management system (BMS), a high-efficiency bidirectional ac-dc converter and the central control unit which controls the operation mode and grid interface of the energy storage system. The BMS estimates the state of charge (SOC) and state of health (SOH) of each battery cell in the pack and applies active charge equalization to balance the charge of all the cells in the pack. The bidirectional ac-dc converter works as the interface between the battery pack and the ac grid, which needs to meet the requirements of bidirectional power flow capability and to ensure high power factor and low THD as well as to regulate the dc side power regulation.A highly efficient dual-buck converter based bidirectional ac-dc converter is proposed.The implemented converter efficiency peaks at 97.8% at 50-kHz switching frequency for both rectifier and inverter modes. To better utilize the dc bus voltage and eliminate the two dc bus bulk capacitors in the conventional dual-buck converter, a novel bidirectional ac-dc converter is proposed by replacing the capacitor leg of the dual-buck converter based single-phase bidirectional ac-dc converter with a half-bridge switch leg. Based on the single-phase bidirectional ac-dc converter topology, three novel three-phase bidirectional ac-dc converter topologies are proposed.In order to control the bidirectional power flow and at the same time stabilize the system in mode transition, an admittance compensator along with a quasi-proportionaliii resonant (QPR) controller is adopted to allow smooth startup and elimination of the steady-state error over the entire load range. The proposed QPR controller is designed and implemented with a digital controller. The entire system has been simulated in both PSIM and Simulink and verified with hardware experiments. Small transient currents are observed with the power transferred from rectifier mode to inverter mode at peak current point and also from inverter mode to rectifier mode at peak current point.The designed BMS monitors and reports all battery cells parameters in the pack and estimates the SOC of each battery cell by using the Coulomb counting plus an accurate open-circuit voltage model. The SOC information is then used to control the isolated bidirectional dc-dc converter based active cell balancing circuits to mitigate the mismatch among the series connected cells. Using the proposed SOC balancing technique, the entire battery sto...

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“…The estimation methods of the battery residual capacity include the discharge test, open circuit voltage measurement, internal resistance measurement, coulometric measurement, loaded voltage measurement, electrolyte concentration measurement, the coup de fouet effect, peulert equation estimation, artificial neural networks, and fuzzy control [11][12][13] …”

Section: Battery Capacitymentioning

confidence: 99%

Improvement of Available Battery Capacity in Electric Vehicles

Liu¹

2013

Journal of Power Electronics

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This paper proposes a new method to improve the available battery capacity in electric vehicles by connecting lead-acid batteries with lithium-ion battery in parallel to supply power. In addition, this method combines the discharge characteristics of batteries to improve their efficiency and lower their cost for electric vehicles. A lithium-ion battery set is used to connect with N sets of lead-acid batteries in parallel. The lead-acid battery supplies the initial power. When the lead-acid battery is discharged by the load current until its output voltage drops to the cut-off voltage, the power management unit controls the lead-acid battery and changes it to discharge continuously with a small current. This discharge can be achieved by connecting the lead-acid battery to a lithium-ion battery in parallel to supply the load power or to discharge its current to another lead-acid or lithium-ion battery. Experimental results demonstrates that the available capacity can be improved by up to 30% of the rated capacity of the lead-acid batteries.

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State-of-Charge Determination From EMF Voltage Estimation: Using Impedance, Terminal Voltage, and Current for Lead-Acid and Lithium-Ion Batteries

Cited by 387 publications

References 20 publications

Towards a Wireless and Low-Power Infrastructure for Representing Information Based on E-Paper Displays

Towards a Wireless and Low-Power Infrastructure for Representing Information Based on E-Paper Displays

A high-efficiency grid-tie battery energy storage system

Improvement of Available Battery Capacity in Electric Vehicles

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