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Analysis and discussion was conducted with our newly invented measurement system on low repeatability in discharge parameters measurement, which is affected strongly by velocity of electrode to the target and gas pressure variation. Several factors of gas pressure, electrode velocity to the target, temperature, relative humidity, etc., can be measured based on our new experiment and research system...
Uninterruptible power supply (UPS) systems have incorporated in their structure an electrochemical battery which allows for smooth power supply when a power failure occurs. In general, UPS systems are based on lead acid batteries; mainly a valve regulated lead acid (VRLA) battery. Recently, lithium ion batteries are getting more and more attention for their use in the back-up power systems and UPSs,...
The intensive care unit (ICU) admits the most severely ill patients, and the goal of the unit can be interpreted as stabilizing patient physiology. Once these patients are discharged from the ICU to a step-down ward, they continue to have their vital signs monitored by nursing staff. Early detection of physiological deterioration has been highlighted as a key step to reduce ICU readmission and improve...
Batteries are a critical component that largely governs the performance and cost of an electric vehicle. There are a variety of types of batteries competing for use, each with cons and pros. Among these options, Li_4 Ti_5 O_12 batteries excel with superior performance in terms of safety, stability, service life. In order to make better use of its merits for electric vehicle applications, understanding...
The bottlenecks of lithium-ion batteries in electric bicycle industry was analyzed. The low-power battery management system with fault diagnosis, SOC and SOH estimates and complete data logging functions was designed based on BQ77PL900 and MSP430, to achieve a precise measurement of the voltage and extend high and low temperature protection. The system used ampere-hour integration method combined...
Inverter-induced high-frequency bearing currents are a common root cause of bearing failures in frequency converter-fed motors and generators. Bearing faults are typically identified by vibration measurements. In our work, we experimentally submit bearings to electric discharge machining (EDM) bearing currents, use different means to measure the electrical stress placed on the bearings, measure the...
This paper presents a comparative study of five sorting methods for Lithium-ion batteries. The principle of each method and the feather of the sorting parameters are obviously described firstly. Then, optimized implement the experiment on LiFePO4/graphite cells. Sorting results are clearly analyzed subsequently. By analyzes the relationship among the parameters, there are strong correlation between...
In domestic air conditioning system the most widely used refrigerant is R22 has a high Global Warming Potential (GWP) of 1700 and a ozone depletion potential (ODP) of 0.05. Hence a new solution for this refrigerant is to be identified. R152a is identified as an alternative to R12 and R22 refrigerants. In this paper an experimental investigation was made to reduce the usage of R22 with the Hydrocarbon...
As levels of variable renewable energy penetration increase, the variable power outputs present significant integration challenges. Traditionally, these challenges have been met with fast-acting, but expensive, dispatchable sources. A promising energy storage technology to buffer the variable power outputs is the use of supercapacitors due to their fast-acting and power dense nature, combined with...
The experimental studies of the charge-discharge behavior and heat generation rate of lithium ion cells at different C-rates are conducted in this paper. We are extending this process to monitor and control the thermal behavior of Li-ion batteries by using phase change material (PCM) as a passive thermal management method to absorb and conduct heat to and from lithium-ion battery modules.
Battery is the major energy storage source of electric vehicles (EVs), which makes the accurate estimation of State-of-Charge (SOC) very crucial. Various SOC estimation methods have been proposed in recent years. Among of them, Ah method is widely used due to its easy implementation. This paper presents an energy method for SOC estimation of power lithium-ion battery, which is based on the law of...
Because of their advantages of no memory effect, relatively long lifetime, and high energy density, lithium ion batteries have now become one of the most popular rechargeable batteries. However, there are some limitations on the usage of these batteries such as low temperature tolerance, potential danger of overcharge, and potential damage of over discharge. Therefore, a battery management system...
This paper investigates the adaptation of different performance maps of centrifugal compressors driven by dual-shaft gas turbines during operation. First the estimation of compressor, gas turbine and combined efficiency are considered. Obtaining performance maps is mainly based on fitting an empirical model to the history of past data together with the understanding of how much new information is...
Thermal modeling of the battery is an effective way to understand how the design and operating variables affect the thermal behavior of the battery during its operation. This paper presents a method for modeling the three-dimensional electrical and thermal behavior of a high energy lithium iron phosphate (LiFePO4) battery cell. The model takes into account the irreversible resistive heat and reversible...
Lithium (Li) ion cells suffer from significant performance degradation at sub-zero temperatures. This paper presents a Predictive Control based technique that exploits the increased internal resistance of Li-ion cells to improve the power capability of Li-ion cells operating at sub-zero temperatures. The current is shaped as bi-directional pulses to minimize total energy discharge and adverse side...
For the first time, different impacts of as-grown and generated defects on nm-sized devices are demonstrated. As-grown hole traps are responsible for WDF, which increases with Vg_op and tw. The generated defects are substantial, but do not contribute to WDF and consequently are not detected by RTN. The non-discharging component follows the same model as that for large devices: the ‘AG’ model. Based...
The U.S. Department of Defense vision for future weapons systems requires the development of electrical pulsers that exceed current state-of-the-art in energy storage density by an order of magnitude or more. Alternatives to conventional wound polymer film and single layer ceramic capacitors are needed. Composite dielectric materials consisting of ceramic nanoparticles in a polymer matrix show promise...
This paper introduces a distributed battery equalization structure for battery strings in which power electronic converters are integrated on battery cells. Because each cell is managed individually, the proposed structure has many advantages over traditional ones. Design issues about power converters are discussed. A two-level control algorithm is proposed to perform global and local functions including...
This paper investigates a new approach based on the fuzzy logic-controlled methodology that is suitable for analyzing and evaluating large format LiMn2O4 cell performance via online state-of-health (SOH) prediction for energy storage system (ESS) applications. The proposed method for online SOH prediction is comprised of two parts. First of all, the values of the cell resistance R and maximum cell...
Due to its capacity to store or supply energy with high power, the supercapacitor is becoming an attractive component. Because of the electrostatic nature of energy storage, the endurance of this component toward repetitive charge and discharge cycles is relatively high. The goal of this paper is to demonstrate that cycling has an impact on the degradation of the supercapacitor and, as a result, on...
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