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The paper presents a modelling approach which, starting from experimental measurements, allows automatically deriving a lithium-ion battery electrical model. This procedure is applied to a 47.7 kW lithium-manganese oxide battery unit in order to infer a third-order Thevenin equivalent electrical model of the unit itself. By means of a matrix representation of specific experimental measurements, it...
The high combined power and energy density of lithium-ion batteries give them great potential for being used as the prime power source for several future naval shipboard pulsed power applications. To meet the power and energy requirements, multiple lithium-ion cells will need to be connected in series and parallel. The number of cells needed will depend on the voltage, capacity, and current limit...
This paper adopts a circuit model with temperature-dependent parameter values to investigate the current unbalance risk in parallel-connected lithium-ion (Li-ion) battery cells and uses this circuit model to calculate heat dissipation. The paper first investigates use of the battery model to explain the impact of temperature on current unbalance in parallel-connected Li-ion battery cells. Experimental...
This paper presents a methodology used to assess the State of Health (SOH) of lithium-ion batteries. This methodology can be readily embedded in all battery management devices including the electronics for electric vehicles. The smart estimation method is based on a Fuzzy Logic System (FLS) and two calculated battery's parameters. Therefore it enhances the SOH value based primarily on both the calendar...
Heat was produced during the charge or discharge process. The performances and circle life will be seriously affected if the heat can not be dissipated immediately. Base on the models and theories of the batteries, analytical solution has been obtained conditioned on certain assumptions with the method of thermal-electrochemical model. According to the optimized chemical model, temperature distribution...
This paper describes experimental results aiming at analyzing lithiumion batteries performances with aging, for different state of charge and temperatures. The results are provided from electrochemical impedance spectroscopy (EIS) measurements on new and aged cells. A climatic test chamber is used during experiments to simulate the conditions of the temperature. Experimental data are plotted over...
This paper describes experimental results aiming at analyzing lithium-ion batteries performances with aging, for different state of charge and temperatures. The results are provided from electrochemical impedance spectroscopy (EIS) measurements on new and aged cells. A climatic test chamber is used during experiments to simulate the conditions of the temperature. Experimental data are plotted over...
Commercial lithium-ion batteries are playing important roles as energy storage solutions for portable devices, automotive electronics and renewable energy systems. In order to maximize the performance of lithium-ion batteries, an advanced charging pattern is required. In this paper, a Taguchi-based algorithm is presented. Orthogonal arrays are implemented to determine the optimal charging pattern...
The Air-Sea Interaction Profiler (ASIP) is an autonomous profiling instrument for upper ocean measurements. The measurements from ASIP are well suited to enhancing research on air-sea interfacial and near surface processes. Autonomous profiling is accomplished with a thruster, which submerges ASIP to a programmed depth. Once this depth is reached the positively buoyant instrument will ascend to the...
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