The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Full charge capacity (FCC) refers to the amount of charge a battery can hold. It is the fundamental property of smartphone batteries that diminishes as the battery ages and is charged/discharged. We investigate the behavior of smartphone batteries while charging and demonstrate that battery voltage and charging rate information can together characterize the FCC of a battery. We propose a new method...
The isolated electrical system is the one solution for electrical distribution in the archipelago. Any disruption to this system would disserve the public and detriment the utility companies because it can't sell the energy. The problem of an isolated solar plant failure is happened in Indonesia exactly in System A. Currently, there are few references that address the investigation of real cases problem,...
A hybrid balancing approach that combines active and passive balancing is presented for a modular battery management system (BMS) in electric-drive vehicles. The hybrid system combines advantages of module-level active balancing with cost-effectiveness of cell-level passive balancing. A module consists of a number of cells connected in series, with cell-level passive balancing performed within a module,...
Lithium-ion batteries are at the forefront of energy storage technology due to its high energy density and durability; they are however expensive and must be operated within certain limits to prevent damaging them. Thus, there is a need for improved condition monitoring to increase its life expectancy and performance. In this work, Electrochemical Impedance spectroscopy (EIS) is implemented using...
Lithium-ion batteries are characterized by having very good performance in terms of efficiency, lifetime, and self-discharge, which allowed them to become the major player in the electric vehicle applications. However, they were not able to totally overcome the EV range anxiety. Thus, research is carried out nowadays to develop batteries with even higher gravimetric energy density, which should allow...
This paper proposes an on-board state-of-health (SoH) estimation method based on the charging current curve during the constant-voltage (CV) stage. Through analyzing the battery aging cycle data, the equivalent time constant based on the equivalent circuit model (ECM) is introduced to describe the dynamic characteristic of the current curve during the CV stage. In addition, only partial current curves...
This paper presents a sinusoidal ripple current (SRC) emulator which superimposes an ac ripple current frequency into a dc charging current in order to produce a sinusoidal ripple current without a ripple current controller. It can be used for several purposes: 1) to analyze the impact of ac ripple current magnitude and frequency on the battery internal characteristics; 2) to determine the parameters...
This paper presents a demonstrator of a Lithiumion battery for automotive applications. A printed circuit board consisting of sensors, local memory elements, a digital signal processing unit and a communication interface is integrated into a Lithium-ion cell case. We demonstrate the mechanical and electrical feasibility of addressing and real-time monitoring of single Lithium-ion battery cells using...
This paper presents a switching-based charger with a time division fast charging (TDFC) control to decrease circuit complexity and charging time for multiple batteries. Time division scheme can deliver a different energy amount to each battery to achieve battery voltage balance and remove the effect of the battery's parasitic resistor to prolong the charging time in constant current (CC) stage. To...
A CMOS fully-integrated Coulomb counter based on a voltage-to-frequency conversion algorithm that measures the state-of-charge (SoC) of a high-density Li-ion battery is presented. Low-side current sensing with a polarity detector is used to monitor the charging and discharging battery current. It is designed in 0.35 μm CMOS process and occupies an active area of 0.01mm2. Except for the sensing resistor...
This paper presents an online capacity estimation method for lithium ion battery cells. The method takes advantage of the significant points defined by state of charge (SOC) and transferred charge. And the unscented Kalman filter based (UKF-based) SOC estimation method is applied for the selection of the significant points. Based on multi significant points, the accurate and robust online capacity...
A parameter estimation study is reported here to estimate the temperature-dependent internal resistance of a lithium ion battery that is connected to the state of its health. A simple equivalent electrical circuit model was used for this purpose that is nonlinear both in its variables and in its parameters. Parameter sensitivity analysis showed that under conditions of constant charging/discharging...
In this work, a detailed experimental characterization of GPRS and 3G data transmission energy consumption, in a custom Remote Telemetry Unit (RTU) is presented. This comparison results valuable for the design of low data-rate, battery-powered, RTUs until reliable and wide spread IoT networks specifically developed for this type of application in suburban areas are available (probably not before 2...
In the last time, the power supplies issues of electronic circuits had become an important issues, especially for mobile devices. The use of classical or Li-ion batteries in the industry, mainly utilized in storage systems, is not a viable solution because these devices, after 2–3 years, lose their ability to store electricity and the materials employed are polluting, even banned in some countries...
Polarization curve is one of the commonly used methods to evaluate the performance of electrochemical devices such as proton exchange membrane (PEM) fuel cells and vanadium redox flow batteries (VRFB). For an optimized PEM fuel cell system, the performance of the fuel cell is steady as long as the fuels are supplied. Long duration of measurement points will have minimum effects on the polarization...
This research aims to prototype a small smart off-grid solar cell system. o provide an alternative electrical supply for a smart Lingzhi mushroom farm. This research applied the use of IOT with voltage and current sensors to measure and monitor the voltage of solar cell charging, amp (ampere) of current charging from the solar panel into a battery and (ampere) of current loading from a battery to...
Solar direct-drive (SDD) appliances including refrigerators and freezers are widely used for storing vaccines and other medical products in locations without reliable mains electricity. The capacity of the solar array powering an SDD appliance must be large enough to provide sufficient compressor runtime during periods of reduced solar irradiance. SDD appliance solar arrays therefore create useful...
The use of batteries and other electrochemical devices in modern power systems is rapidly increasing, with stricter requirements in terms of cost, efficiency and reliability. Innovative monitoring solutions are therefore urged to allow a successful development of a wide range of emerging applications, including electric vehicles and large-scale energy storage to support renewable energy generation...
In this paper, system identification is carried out for a 20 kWh battery using real-world measurements data. State-of-charge (SOC) and the open-circuit voltage (Voc) relationship will be obtained using least square estimation (LSE) non-linear regression. In addition, how to estimate SOC using current measurements and how to estimate the equivalent circuit's RC parameters are carried out using autoregressive...
In this paper, we present our Energy Management Systems (EMS) with intelligent anomaly detection techniques that achieve real-time detection of outlier(s), prediction of future fault(s), and extraction and amendment of historical data anomalies. The EMS has adopted advanced outlier detection theories and frameworks to optimize the use of key energy devices such as distributed energy storages with...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.