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In the regulation of heating, ventilation, and air conditioning (HVAC) for a peak cut or peak leveling control of electric power consumption, the amenity of the living environment should be considered. In the existing method, the metabolic equivalent (MET) value is not considered because of the substantial measurement costs and because a special infrastructure is required for both measuring the value...
Mobile systems with lithium-ion batteries have become very popular. Higher performance, longer battery life, and safer operation are required for those systems. We have developed a method of the thermal management system for lithium-ion batteries for mobile systems. An evaluation system has been built with micro-processor with analog interface, and FPGA. It provides a charge and discharge speed control...
Users of mobile devices typically charge their devices over night. In these situations, it is acceptable to the users for the phone to take several hours to charge. But at times, such as when traveling, users want fast charging for their devices, and would like to have the battery maintain high charging capacity for an extended period without need to recharge. However, the battery's charging capacity...
The number of fluctuating energy sources in the power grid increases continuously. Simultaneously the importance of electrical energy storage increases. Batteries are one promising possibility for short-term storage. In this work a mathematical impedance model of a Lithium-ion battery with high dynamics for simulation of loads due to driving cycles and battery-to-grid applications as well as parameterization...
With over 20 years of continuous monitoring of batteries, archival of a trillion points of data, timelines, and trends of over 1.2 million battery units, we are finding some common aging history.
The use of portable electric devices in a wide range of applications leads to the need for thorough battery testing and selection. This paper presents a system for battery lifetime evaluation using a CompactRIO™ programmable automation controller and a Touch Panel Computer. The LabVIEW™ environment is used for creating different scenarios which simulate the functioning of a battery powered Wi-Fi data...
The goal of this paper is to present the implemented solution for a universal battery management system. This system is designed for usage of both smart and dumb rechargeable battery packs, regardless of the manufacturer. The implemented solution is based on a dual channel smart battery charger IC and two gas gauge ICs. The advantage of this solution is that a device main board can be powered by various...
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...
Wireless sensor nodes have many compelling applications such as smart buildings, medical implants, and surveillance systems. However, existing devices are bulky, measuring >1cm3, and they are hampered by short lifetimes and fail to realize the “smart dust” vision of [1]. Smart dust requires a mm3-scale, wireless sensor node with perpetual energy harvesting. Recently two application-specific implantable...
This paper presents an electrical battery model for lithium-ion (Li-ion) batteries that can be used for dynamic simulations of hybrid electric non-road mobile machinery (NRMM) and other vehicles. Although the model has been developed mainly for large vehicle batteries with Li-ion based chemistries, it can be used for other battery chemistries as well. The parameters can be extracted from simple measurement...
In automotive applications, submarines and remote communication systems it is necessary to know the state of charge (SOC) of the batteries in order to manage them efficiently. Due to the acid concentration dependence of SOC, traditionally, density measurements are done in order to estimate it. But other parameters like electrolyte viscosity have highest changes with SOC than density. In this paper,...
Battery management system can provide accurate and reliable power battery information to electric vehicle, as well as carry on real-time monitoring to the various functions of battery management system itself operated. And it also can carry on acquisition and analysis to battery running data. The electric vehicle power battery management system designed in this paper has solved the real-time accurate...
This paper presents efficiency measurements for a 125 V/63 F supercapacitor module (SC) and a 96 V/90 Ah lithium-ion (li-ion) battery system as a function of charge-discharge current frequency. The result would be useful in the design of efficient power flow control in systems using SCs and li-ion batteries as parallel energy storages, and offers a possibility to predict energy storage power losses...
SOC (State Of Charge) was one of the most important parameters for EVs (Electric Vehicles). It was the basis for EVs to prevent over-charging and over-discharging. Many researchers had been done to improve SOC estimation accuracy. In this paper, definition of SOC was discussed and the traditional SOC estimating algorithms and some improved SOC estimation algorithms were reviewed. The principles of...
In this paper a new wireless sensor node intended for use in ultra-low power Wireless Sensor Networks (WSN) is presented. The node uses commercial of-the-shelf radio, microcontroller and a custom developed antenna embedded in the housing. Over-molding with food-compatible material is used to improve the mechanical robustness of the node. The present work is targeted at commercial food cold chain management...
This paper deals with the design of an electric kart. It includes also descriptions of chosen parts like LiFeYPO4 batteries, MOSFET converter, sensors and electronics control system. The electric kart is designed with the similar nominal engine power as karts commonly used in karts rent business. The topology of electrical equipments is based on a CAN bus and allows further expansions by students...
In this article a method to estimate the capacity of individual lithium ion battery cells during operation is presented. When having two different states of charge of a battery cell as well as the transferred charge between these two states, the capacity of the battery cell can be estimated. The method is described in detail and validated on a battery cell with a current pulse test cycle. It is then...
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...
Battery thermal management for high power applications such as electrical/hybrid vehicles is crucial. Modeling is an indispensible tool to help engineers design better battery cooling systems. An accurate battery thermal model using Foster network is proposed. The parameters in the Foster network including capacitance and resistance are extracted from Computational Fluid Dynamics (CFD) results. The...
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