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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...
In this study, we have proposed an ingestible sensor platform utilizing gastric acid battery for daily healthcare. This platform has a fundamental application to precisely measure core body temperature as one of the most useful vital signs for health check. It also has the expandability to add various biosensors such as pH, pressure sensors etc‥ The architecture without a conventional battery is essential...
We present the design, development and testing of an electronics module to harvest, regulate and store vibrational energy. The module includes a flexible rechargeable battery to store the harvested vibrational energy generated from normal human physical motion. The proposed regenerative power source is examined by integrating with a Galvanic Skin Response (GSR) sensor suitable for continuous long...
The wide diffusion of Full and Hybrid Electric Vehicles is stimulating research on electric energy storage systems and Battery Management Systems (BMS). The Battery management system must ensure many complex features such as charge control, battery-capacity monitoring, remaining run-time information and charge-cycle counting. An optimization of the BMS can allow an improvement on security of the vehicle,...
In this paper, an automated battery test bench is proposed. The proposed bench consists of circuit breaker unit, uninterruptible power supply unit, system load unit, twelve battery research channels, distribution device, heat chamber, computerized control measuring device and communication device. The bench allows to perform thermal, resource and electrical tests of several lithium-ion batteries simultaneously...
In this paper, an automated battery test stand is proposed. The proposed stand consists of circuit breaker unit, uninterruptible power supply unit, system load unit, twelve battery research channels, distribution device, heat chamber, computerized control measuring device and communication device. The stand allows to perform thermal, resource and electrical tests of several lithium-ion batteries simultaneously...
Estimating State-of-Health(SOH) for electric vehicle(EV) batteries is the most crucial to determine replacement time of the battery or to calculate driving mileage. However, partial charge and discharge, or steep changes of current loads imposed in EV increase estimation error. In this paper, we present a data-driven method for Battery Management System(BMS) to precisely estimate the SOH reflecting...
To the requirements that SOC equalization system for real-time data acquisition and accuracy of voltage, temperature and current of each single battery, using the special battery test chips- LTC6804-1 made in the company of Linear which have been cascaded and combining microprocessors of Freescale KEA128 series can complete the data collection to a large number of cells in a relatively short period...
An environmental measurement system was developed using a low-power sensing module, IEEE 802.11 (Wi-Fi) connection module, and a small solar cell and battery. An Arduino-based sensing module was used for many kinds of analog/digital outputs sensors with the Arduino software library. The data from the module were sent via Wi-Fi HTTP(S) clients operation, and collected by MySQL server using PHP (Hypertext...
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...
Today, battery electric vehicles as well as stationary battery system demand lithium-ion batteries. Lithium titanate battery cells with their excellent charge and discharge rate capabilities in combination with their long lifetime have become an attractive option for these kinds of applications. However, to ensure safe operation of lithium batteries — especially in high power applications — temperature...
In this paper, we present a system to estimate the health of a lead-acid car battery and warn the driver of upcoming battery failure in the near future. Most existing lead-acid battery state of health (SOH) estimation systems measure the battery impedance by sensing the voltage and current of a battery. However, current sensing is costly for parts and/or labor. A method to estimate SOH by sensing...
An optimized state of charge (SOC) estimation method is critical for energy control strategy in hybrid energy system. For an embedded system, the executed algorithm should be less time consuming and also robust on measurement noise from sensors. Moreover, the estimation method should also be insensitive to initial SOC for the purpose of avoiding battery relaxing time in real application. The proposed...
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...
Battery characteristics in the conditions with/without internal temperature gradient are believed to be different, which imposes difficulty in characterization and modeling of the performance of battery cells, and relatively few studies have conducted the investigation of the effects of thermal gradients on battery characteristics. This paper makes a preliminary study on the influence of internal...
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...
Lithium ion battery is widely used in electric vehicles. To estimate battery state-of-charge, state-of-health and internal temperature accurately is not only in laboratory but also on-board significant. As a useful tool to study electrochemical system, numbers of estimation methods based on electrochemical impedance spectroscopy arise. The paper focuses on the relation between the battery states and...
Energy storage systems based on Lithium-ion batteries have been proposed as an environmental friendly alternative to traditional conventional generating units for providing grid frequency regulation. One major challenge regarding the use of Lithium-ion batteries in such applications is their cost competitiveness in comparison to other storage technologies or with the traditional frequency regulation...
Lithium-ion (Li-ion) batteries are found nowadays not only in portable/consumer electronics but also in more power demanding applications, such as stationary renewable energy storage, automotive and back-up power supply, because of their superior characteristics in comparison to other energy storage technologies. Nevertheless, prior to be used in any of the aforementioned application, a Li-ion battery...
Due to their high storage capacity, low self-discharge rate and long lifetime Lithium-Ion batteries are key elements for the emerging electro-mobility and for stationary “Battery Electrical Storage Systems” (BESS). However, Li-Ion batteries are still very expensive and must be handled very carefully to exploit their features optimally. Hence, “Battery Management Systems” (BMS) have been developed...
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