Analysis of Lead-Acid batteries with a third-order dynamical model

Electrical energy storage is a really important issue nowadays. As electricity is not easy to be directly stored, it can be stored in other forms and converted back to electricity when needed. As a consequence, storage technologies for electricity can be classified by the form of storage, and in particular we focus on electrochemical energy storage systems, better known as electrochemical batteries. Largely the more widespread batteries are the Lead-Acid ones, in the two main types known as flooded and valve-regulated. Batteries need to be present in many important applications such as in renewable energy systems and in motor vehicles. Consequently, in order to simulate these complex electrical systems, reliable battery models are needed. Although there exist some models developed by experts of chemistry, they are too complex and not expressed in terms of electrical networks. Thus, they are not convenient for a practical use by electrical engineers, who need to interface these models with other electrical systems models, usually described by means of electrical circuits. There are many techniques available in literature by which a battery can be modeled. Starting from the Thevenin based electrical model, it can be adapted to be more reliable for Lead-Acid battery type, with the addition of a parasitic reaction branch and a parallel network. The third-order formulation of this model can be chosen, being a trustworthy general-purpose model, characterized by a good ratio between accuracy and complexity. Considering the equivalent circuit network, all the useful equations describing the battery model are discussed, and then implemented one by one in Matlab/Simulink. The model has been finally validated, and then used to simulate the battery behaviour in different typical conditions.

Towards Batteryless Cardiac Implantable Electronic Devices – The Swiss Way

Energy harvesting devices are widely discussed as an alternative power source for todays active implantable medical devices. Repeated battery replacement procedures can be avoided by extending the implants life span, which is the goal of energy harvesting concepts. This reduces the risk of complications for the patient and may even reduce device size. The continuous and powerful contractions of a human heart ideally qualify as a battery substitute. In particular, devices in close proximity to the heart such as pacemakers, defibrillators or bio signal (ECG) recorders would benefit from this alternative energy source. The clockwork of an automatic wristwatch was used to transform the hearts kinetic energy into electrical energy. In order to qualify as a continuous energy supply for the consuming device, the mechanism needs to demonstrate its harvesting capability under various conditions. Several in-vivo recorded heart motions were used as input of a mathematical model to optimize the clockworks original conversion efficiency with respect to myocardial contractions. The resulting design was implemented and tested during in-vitro and in-vivo experiments, which demonstrated the superior sensitivity of the new design for all tested heart motions.

An initial assessment of the literature on the measurement, control, transport, transformation and health effects of urregulated diesel engine emissions /

Final report, January 1979.

An evaluation of existing motor vehicle diagnostic inspection concepts. Volume I: executive summary. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

An evaluation of existing motor vehicle diagnostic inspection concepts. Volume II: characteristics of motor diagnostic inspection facilities. Final Task 1 report.

National Highway Traffic Safety Administration, Washington, D.C.

An evaluation of existing motor vehicle diagnostic inspection concepts. Volume III: characteristics of periodic vehicle inspection programs. (Results of Task 2). Final Task 2 report.

National Highway Traffic Safety Administration, Washington, D.C.

An evaluation of existing motor vehicle diagnostic inspection concepts. Volume IV: methodology for developing the diagnostic inspection concepts. (Results of Task 3). Final report.

National Highway Traffic Safety Administration, Washington, D.C.

An evaluation of existing motor vehicle diagnostic inspection concepts. Volume V: motor vehicle diagnostic inspection planning manual. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

1992 census of manufactures.

Mode of access: Internet.

Motor vehicle laws of Virginia.

"Reprint from the Code of Virginia of 1950 and the 1952 cumulative supplement."

Highway traffic safety self-instruction course: module 3 workbook - motor vehicle safety standards.

National Highway Traffic Safety Administration, Washington, D.C.

Effects of future conditions upon motor vehicle safety requirements. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Motor vehicle defects and recall campaigns.

Mode of access: Internet.

Program plan for motor vehicle safety standards 1970 through 1972.

Mode of access: Internet.

Impact of discontinuing Idaho's periodic motor vehicle inspection program (a before and after outage rate study).

Mode of access: Internet.