Topic
State of charge
About: State of charge is a research topic. Over the lifetime, 12013 publications have been published within this topic receiving 201419 citations. The topic is also known as: SoC & SOC.
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31 Oct 2008
TL;DR: In this paper, a data-driven approach was proposed to estimate three critical characteristics of the battery (SOC, SOH, and RUL) using a data driven approach, which is based on an equivalent circuit battery model consisting of resistors, capacitor, and Warburg impedance.
Abstract: Battery management system (BMS) is an integral part of an automobile. It protects the battery from damage, predicts battery life and maintains the battery in an operational condition. The BMS performs these tasks by integrating one or more of the functions, such as protecting the cell, controlling the charge, determining the state of charge (SOC), the state of health (SOH), and the remaining useful life (RUL) of the battery, cell balancing, as well as monitoring and storing historical data. In this paper, we propose a BMS that estimates three critical characteristics of the battery (SOC, SOH, and RUL) using a data-driven approach. Our estimation procedure is based on an equivalent circuit battery model consisting of resistors, capacitor, and Warburg impedance. The resistors usually characterize the self-discharge and internal resistance of the battery, the capacitor generally represents the charge stored in the battery, and the Warburg impedance represents the diffusion phenomenon. We investigate the use of support vector machines to predict the capacity fade and power fade, which characterize the SOH of a battery, as well as estimate the SOC of the battery. The circuit parameters are estimated from electrochemical impedance spectroscopy (EIS) test data using nonlinear least squares estimation techniques. Predictions of remaining useful life (RUL) of the battery are obtained by support vector regression of the power fade and capacity fade estimates.
98 citations
TL;DR: Experimental results show that PCIEP is of high efficiency and can effectively prevent premature convergence, and the proposed approach can provide an accurate estimation of the SOC of Ni–MH batteries under the state of a dynamic power cycle.
98 citations
TL;DR: In this article, a real-time and approximately optimal energy management strategy based on Pontryagin's minimum principle (PMP) considering both fuel economy and power source durability is presented.
97 citations
TL;DR: In this article, a novel online estimation technique for estimating the state of charge (SoC) of a LiFePO4 battery has been developed based on a simplified model, the open circuit voltage (OCV) of the battery is estimated through two cascaded linear filtering stages.
97 citations
Patent•
24 Jun 2011
TL;DR: In this article, the authors present techniques and/or circuitry to applying a current pulse to the terminals of the battery during a charge, measuring a voltage at the terminals, determining a relationship of an open circuit voltage to an amount of charge in the battery using data which is representative of a state of health of battery.
Abstract: The present inventions, in one aspect, are directed to techniques and/or circuitry to applying a current pulse to the terminals of the battery during a charge, measuring a voltage at the terminals of the battery, determining a relationship of an open circuit voltage to an amount of charge in the battery using data which is representative of a state of health of the battery, calculating an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery, and determining a state of charge of the battery using (i) the calculated open circuit voltage and (ii) the relationship of the open circuit voltage to the amount of charge.
97 citations