Browsing by Subject "battery"

Now showing 1 - 4 of 4

BUS High Current Battery Model
(IEEE, 1993-01) Kajs, J.P.; Zowarka, R.C.
An empirical model for voltage and equivalent series resistance (ESR) has been developed for lead acid batteries used as a pulsed power source. During the design of the battery upgraded supply (BUS) for Eglin Air Force Base, the Center for Electromechanics at the University of Texas at Austin (CEM-UT) developed a model for the batteries to be used in this system. BUS is a 5 MA, 500 MJ inductive power supply charged by batteries for use as a railgun power supply. A series of tests was performed to determine the driving voltage and ESR of the batteries for discharge times from 2 to 10 s and current levels from 500 to 2500 A. A model for voltage and ESR was obtained from these tests. The methods used and sample data from the tests are presented. The main factors affecting battery voltage and ESR are discussed, and the models developed for the batteries tested are described. It is concluded that the proposed empirical model can be used to predict the performance of Pulsar batteries as long as the currents are around 500 to 2500 A and the timeframes are from 2 to 10 s
Design and Fabrication of a Tandem, Five Megamapere Initiate Switch for the Battery Upgraded Supply
(IEEE, 1993-01) Aanstoos, T.A.; Zowarka, R.C.; Upshaw, J.L.
The authors report on the design, fabrication, and component testing for the tandem initiate switch system for the battery upgraded supply, in which each armature is rated for a 3 s rise to 2.5 MA peak current (2.8 MA fault), followed by a 5 s dwell before end-of-test interruption. The two switches are ganged on a common (but insulated) shaft, which contains an adjustable coupling for jitter control and is actuated by a fast axial hydraulic actuator. Special design features of this switch system include an externally adjustable radial spring, linear shaft bearings, safety interlocks, and temperature instrumentation. Full-scale component tests were designed and are being conducted to verify radial contact force, temperature distribution under full action, mechanical stability under full force, proper velocity profile for the full switch assembly, and elimination of jitter
Discovery of next-generation battery electrodes using topology optimisation
(University of Texas at Austin, 2023) Imediegwu, Chikwesiri; Shaffer, Milo; Ryan, Mary; Panesar, Ajit
Energy storage systems (ESSs) are essential components for the delivery of uninterrupted renewable energy of the future. A key stride towards the development of these systems revolves around the design of insertion-electrode batteries (IEBs). However, battery cell performance metrics of capacity and rate capability in these batteries are limited by inefficient ion and electron transport due to the complex transport channels the ions must navigate to reach storage sites – a fundamental limitation of slurry-cast (SC) type electrodes. We present a gradient-driven approach to derive optimal electrode architecture, constrained only by the underlying multiphysics system defining transport mechanisms in and across solid and liquid phases. The derived framework challenges the traditional manufacturing techniques for electrodes, inspiring novel strategies for deriving new high-performance electrodes.
Dynamic Load and Storage Integration
(IEEE, 0000-00-00) Hebner, R. E.; Davey, K.; Herbst, J.; Hall, D.; Hahne, J.; Surls, D.; Ouroua, A.
Modern technology combined with the desire to minimize the size and weight of a ship’s power system are leading to renewed interest in more electric or all electric ships. An important characteristic of the emerging ship power system is an increasing level of load variability, with some future pulsed loads requiring peak power in excess of the available steady– state power. This inevitably leads to the need for some additional energy storage beyond that inherent in the fuel. With the current and evolving technology, it appears that storage will be in the form of batteries, rotating machines, and capacitors. All of these are in use on ships today and all have enjoyed significant technological improvements over the last decade. Moreover all are expected to be further enhanced by today’s materials research. A key benefit of storage is that, when it can be justified for a given load, it can have additional beneficial uses such as ride-through capability to restart a gas turbine if there is an unanticipated power loss; alternatively, storage can be used to stabilize the power grid when switching large loads. Knowing when to stage gas turbine utilization versus energy storage is a key subject in this paper. The clear need for storage has raised the opportunity to design a comprehensive storage system, sometimes called an energy magazine, that can combine intermittent generation as well as any or all of the other storage technologies to provide a smaller, lighter and better performing system than would individual storage solutions for each potential application.