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In stable electrical networks, such as the German one, the service of uninterruptible power supply (UPS) systems is only rarely called. Consequently the battery lifetime in this application is mostly restricted by calendar aging. The concept of multi-use describes here the delivery of additional services with a UPS during stable grid operation. The overall goal is to allocate the battery capacity...
Modern systems of traditional and alternative energy, transport systems include powerful uninterruptible power supplies (UPS), implemented on batteries of charged electrochemical current sources — accumulators. These modules ensure the functioning of the systems in case of accidents or technological failures in the operation of main power supplies. The ability to provide the given energy modes by...
In this paper, we propose a cross-referring approach using a dual adaptive filter to estimate the state-of-charge (SOC), full charge capacity (FCC), and resistance of a battery in a real-time manner. Although conventional SOC estimation methods such as the Coulomb counting and the open-circuit voltage (OCV) estimation are commonly used for battery systems, accuracy of their SOC estimates are deteriorated...
Battery energy capacity in an application system is determined by the amount of electrical energy spent to the load and time consumption. The system reliability depends on the supply of electrical energy from the battery as the power source. The energy capacity of the battery will ensure the services provided by the unit device or equipment. As an example, the UPS system provides clean, conditioned,...
This paper provides importance of stationary VRLA battery health measurement system in critical energy storage applications. Factors affecting battery health and role of battery internal resistance on capacity loss are detailed. A comparison of different test methods used for health estimation in present industry is tabulated. Resistance estimation by dc method and ac methods are simulated and tested...
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...
Energy Storage System (ESS), with its fast ramping and bi-direction power flow capabilities, is playing a more vital role in the electric market. However, it still stands on the farther end of economic viability. As a result, a good estimate of battery service life, and therefore revenue, is necessary before the investment is made in any given application. In this paper, a set of improved degradation...
This paper proposes a robust, intelligent constant current-constant voltage (CC-CV) charger for fast charging an aging Lithium-ion battery. Increasing the charging current in the CC regime cannot guarantee the short charging time, so an optimal charging current exists in the CC-CV method. The optimal charging current changes with battery degradation, so this paper figures out a way to find the optimal...
Based on the single point of failure model, the paper aims to provide a new detection method for insulation resistance of electric vehicle battery pack and present the principle analysis the deriving equations. By comparing the measurement results through the associated national standards of the People's Republic of China, i.e. GBT 18384.1-2001 for electric vehicles insulation resistance, discusses...
Due to advanced fuel-saving features, used in micro-hybrid vehicles, stresses on automotive batteries have significantly increased. To ensure a safe operation and avoid overloading the battery, its state has to be monitored constantly. However, due to the availability of different technologies of lead-acid batteries with distinct behavior, for a correct state estimation the battery type has to be...
In this paper we present an overview of the state-of-the-art on intelligent battery management systems for electric and hybrid electric vehicles. The focus is on mathematical principles, methods and practical implementations. The intelligent battery management systems aim at lengthening the lifetime of the battery pack and enhancing the safety of drivers of electric and hybrid electric vehicles. Three...
Working capacity and life of the battery as a whole are significantly determined by the degree of its individual cells' parameters identity. At acquisition of batteries, as a rule, the key parameters for the cells selection are their nominal capacity and internal resistance. Measuring these parameters via traditional methods requires a significant amount of time, implementation of special measuring...
This paper describes a mismatch of internal resistance battery LiFePO4 when assembling into battery pack. Internal resistance battery is a number that states the value of resistance that exist within the battery component, it will affect the State of Health, State of Charge, life time, until the heat generated by the battery. The tools used in this experiment include the internal resistance tester...
Most of the Wireless sensors today are powered using lithium batteries. The need to detect the end of life for these batteries has increased in the recent past due to a large manufacturing variation between suppliers and storing practices. It has become a challenge to explore the ways to access the health of these batteries in field due to the difficulty in measuring the internal state variables of...
Due to the small ohmic resistance, such as the LFP battery, off-line state-of-health (SOH) estimation based on ohmic techniques faces a great challenge on measurement difficulty. The inaccurate measurement result of the ohmic resistance can cause a severe SOH error. This paper studies the influences of battery external resistance on the off-line SOH estimations using different model parameters in...
A long-term operation test of electric buses on public roads was performed in Nagano as part of a project of the Japan Ministry of the Environment from 2011 to 2014. For this project the short-range frequent- charging type electric buses, "Waseda Electric Buses (WEBs)" were developed. WEB-3, one of the test vehicles, was driven for 41,724 km without any major problems and had advantages...
The operating temperature has a significant impact on the performance of electrochemical systems such as batteries. The amount of energy stored inside depends largely on the temperature (especially under 0°C). To maintain a good energy performance of the electric vehicle, it is necessary to know the parameters that characterize the battery to allow a better approximation of the amount...
Generally, the way of 0.1C current fully discharge battery capacity measurement, which is required for 10 hours discharge during this process, is time and energy consuming. This paper is to introduce a new method to measure battery capacity accurately in shorter time. This new method will use the technique of multi-frequency measurement for battery during discharge. This measurement will eventually...
This paper presents the means for extending a battery model from a single cell to a battery pack with Battery Management System (BMS. Several modeling strategies are analyzed and a new one based on the cell with the minimum capacity is developed and implemented.
This paper deals with the characterization of Lithium batteries discharged by high power pulses. The experiments were conducted with a commercial ultra high power Li-Ion cell (A123 26650M1-A), which was tested by means of an ad - hoc implemented experimental setup under controlled climatic conditions. Performance reduction of the cell, in terms of capacity and efficiency losses, is analyzed and discussed...
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