Small Fuel Cells For Portable Applications 9th Edition ---- Aarkstore Enterprise

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Table of Contents :

Chapter 1

Methods and Tools for Designing Successful Hybrid Systems

Roger A. Dougal, PhD, Professor of Electrical Engineering, VTB Project Director, University of South Carolina

Design of fuel cell and battery hybrid systems entails integration of strongly interdisciplinary sub-systems involving everything from electrochemistry and power electronics to fluid and heat transfer. The design process can be simplified by the application of appropriate multidisciplinary design tools. This presentation will describe methods for hybrid system design and illustrate those methods with example systems that have been validated in hardware.

Chapter 2

Direct Borohydride Fuel Cells: A Nzovel Class of Fuel Cell - Battery Hybrid Technology

Gennadi Finkelshtain, Chief Technical Officer, Medis Technologies

Medis Technologies Direct Borohydride Fuel Cells (DBFC) offers a compelling alternative to the traditional fuel cell chemistries. Medis has launched its first consumer product, the Medis 24/7 Power Pack, based on a novel approach, including proprietary chemistry and assembly technologies. We will provide an overview Power Pack product, including performance, production technology and chemistry. Medis has developed a second generation hybridized version of our Power Pack and we will provide an overview of our hybridization method, including an overview of the performance benefits created by hybridization.

Chapter 3

Identification and Characterization of Near-Term Commercial Markets for PEM Fuel Cells in Portable Applications

Kathleen Judd, Senior Research Scientist, Pacific Northwest National Laboratory/ Battelle Memorial Institute

In a study for the U.S. Department of Energy, TV broadcasting video cameras were identified as a near-term opportunity for portable direct hydrogen PEM fuel cells. A technical comparison of PEM fuel cells and competing battery alternatives was performed for TV broadcasting video cameras. The comparison includes a lifecycle cost analysis of fuel cell and battery technologies (lithium ion and nickel cadmium) under different use scenarios for TV broadcasting video cameras. A sensitivity analysis was also performed to show the variability in average annual system cost as individual factors (e.g. cost, durability of the fuel cell) are varied while other factors are held constant. A value proposition was defined for this market based on the overall market, economic, and technology assessments.

Chapter 4

Durability and Design of Battery/Fuel Cell Hybrid Systems

Tom Fuller, PhD, Professor, Director of the Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology

Hybrid architectures are becoming common regardless of the system scale. The principal goal of system design has been minimizing fuel consumption. Whereas it is understood that the components of the system must be evaluated and the control strategy scrutinized simultaneously, whats missing is any consideration of the durability of the electrochemical devices. The necessity of understanding and predicting not just initial performance but life behavior is paramount to commercialization of these power systems. A system model elucidates the interactions between components and enables the response of the system as a whole to changing load demands to be determined. Their life and the associated failure mechanisms are strongly dependent on the architecture, load profile, and control strategies. This is illustrated with an example of platinum stability in a fuel-cell hybrid system.

Chapter 5

Development of a Fully-Integrated, Hybrid, High Temperature PEM Fuel Cell/Lithium Ion Battery Power Plant

Daniel A. Betts, PhD, Engineering Manager, EnerFuel, a subsidiary of Ener1, Inc.

From a business standpoint, Ener1, Inc. is well-positioned to take advantage of the upcoming demand for fuel cell/battery automotive power plants. Ener1 is the parent company of EnerDel, an automotive lithium-ion battery developer, and EnerFuel, a fuel cell company. While EnerDel is in the process of establishing itself as an important player in the automotive lithium ion battery market, EnerFuel has been developing fuel cells with substantial technical advantages over traditional automotive fuel cell technologies. EnerFuel has pioneered high temperature PEM fuel cell stacks. High temperature operation has allowed EnerFuel to pursue designs that are durable, thermally stable, compact, and relatively inexpensive. In this presentation, quantifiable benefits of EnerFuels high temperature PEM fuel cell are discussed.

Chapter 6

Fuel Cell and Battery Hybrid System for Portable Electronics Applications

Naehyuck Chang, PhD, Associate Professor, Dept of Electrical Engineering and Computer Science, Seoul National University

This talk introduces a PEM fuel cell and Li-ion battery hybrid system for use in portable microelectronic systems which are subject to high power fluctuation though their average power consumption is small. We introduce several issues in fuel cell and battery hybrid systems for such systems in view of computer engineering that includes architectures of hybrid systems, battery management, load shaping using power management techniques, and a prototype implementation.

Chapter 7

Department of Energy Polymer Electrolyte Membrane (PEM) Fuel Cell R&D Activities

Terry Payne, PhD, PE, Technology Development Manager, Hydrogen, Fuel Cell & Infrastructure Technologies Program, The U.S. Department of Energy

Though the DOE Hydrogen Program emphasizes polymer electrolyte membrane (PEM) fuel cells in passenger vehicles, the program also supports fuel cells for portable power applications where earlier market entry would assist in the development of a fuel cell manufacturing base. This talk will provide an update on the status of DOE PEM fuel cell development particularly for portable power, ongoing efforts to eliminate barriers, and the path being pursued.

Chapter 8

Direct Ethanol Fuel Cells: An Emerging Technology with Reduced Logistic Footprint for Military and Civil Applications

Carsten Cremers, PhD and Michael Krausa, PhD, Fraunhofer Institute for Chemical Technology ICT

An important goal of replacing primary batteries by hybrids of rechargeable batteries and fuel cells is to reduce the logistic effort in power supply. Fuel cells using ethanol would be beneficial as ethanol offers a higher availability and easier handling compared to methanol. However, the performance of todays DEFCs does not compete with that of commercial DMFCs. To improve this performance two approaches are currently pursued, a multistep process in proton exchange membrane based DEFC and alkaline DEFC using anion exchange membranes. The current state of the art of both approaches will be presented and their advantages and disadvantages will be discussed.

Chapter 9

Micro Fuel Cell System for Mobile Consumer Electronic Devices

Shuji Goto, and Tadashi Senoo, Manager, Materials Laboratory, Sony Corporation

We are developing micro fuel cell systems for mobile consumer electronic devices. The system consists of series-connected direct methanol fuel cells, a fuel pump, a fuel cartridge, a Li-ion polymer battery and a power management circuit. We have achieved high power output, high energy efficiency and overall system size reduction by the combination of material development, power management algorithm development and component downsizing.

Chapter 10

Mobile DMFC: Enhancement of Stack and System Stability

Inseob Song, PhD, Principal Manager-Fuel Cell Project, Samsung SDI Co, Ltd, Samsung

Recent advancements on mobile DMFC system will be presented. Stack and system

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