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18th International Seminar on Double Layer Capacitors
& Hybrid Energy Storage Devices
December 8 - 10, 2008
Seminar Tutorials
Two individual tutorials are being offered on
the Monday morning prior to the start of the formal seminar. Seminar participants can
sign up for one or both of these tutorials by selecting them when registering online.
Workbooks are provided to the tutorial participants covering the material
presented by the speakers. Following the tutorial presentations, any remaining
workbooks and past workbooks can be purchased by contacting Redox Engineering via phone or
email. Utilize the
Contact Us page to get pricing and
availability.
2008 SEMINAR
TUTORIAL #1 (8:30 - 11:00)
Reliability
Assessment and Engineering of Electrochemical Capacitors
Dr. John R. Miller,
President, JME Inc., Shaker Heights, OH, USA
In recent years the increasing
availability of newer, enhanced-performance electrochemical capacitor (EC) cells
and modules has vastly expanded the number of applications for them. Complex
applications employing large numbers of cells are more and more common,
applications that of necessity require the satisfactory operation of each and
every cell in the system for the entire system to perform properly. This is
particularly critical in applications in medical systems, where real minimum
levels of reliability for application qualification may apply. A clear
understanding of EC reliability, particularly as ECs are used in systems, is
thus increasingly important.
This tutorial presents basic
information EC users need in order to understand and to achieve EC reliability
goals. What, for instance, constitutes an acceptable system failure rate? How
can we determine a specified mean time between failures? The course starts with
how to read a manufacturer’s specification sheet for component reliability. We
then outline the test methodology for determining EC life as a function of
applied stress, using for this purpose a statistically balanced design and aging
conditions at both normal and elevated stress levels. What approaches are there
for extracting aging acceleration factors, and how can we be sure that in doing
so we have not introduced uncharacteristic ways for either cells or systems to
fail? Understanding these factors allows us to develop reasonable projections
for EC life under specific application conditions. We next examine how to
calculate the effect on that life when large numbers of cells are used to make
up a system. How, further, can we quantify how non-uniform cell voltages and
non-uniform cell temperatures reduce life, and under what conditions
charge/discharge cycle testing should be performed?
The overall plan of this course
is, thus, to provide basic information, presented in a practical manner, that
focuses on technologically important examples.
About the Instructor
 John
R. Miller is
President of JME, Inc., a company he started in 1989 to serve the
electrochemical capacitor (EC) industry by providing materials evaluations,
capacitor design services, capacitor testing, reliability assessment, and system
engineering. Dr. Miller has reported on many critical EC technology issues and
prepared test methods for the DOE. He was Chair of the annual Advanced
Capacitor World Summit for five years, and now heads the capacitor symposium
at the Advanced Automotive Battery and Ultracapacitor Conference. His
present activities include reliability evaluations of ECs for heavy hybrid
vehicles and development of an advanced EC for the U.S. Navy’s all-electric
ship. Dr. Miller previously held positions at SOHIO, the University of
Rochester, and Los Alamos National Laboratory. He earned BS and Ph.D. degrees in
physics from the Massachusetts Institute of Technology, and has 50+ publications
and 8 patents.
2008 SEMINAR
TUTORIAL #2 (11:15 - 12:45)
Ultracapacitor from an Application & System Engineering Prospective
Dr. John M.
Miller, VP, Maxwell Technologies Inc., San Diego, CA, USA
This tutorial focuses on the systems level attributes of
the carbon-carbon ultracapacitor. Coverage is given to electronic equivalent
circuit model development of the ultracapacitor, laboratory validation of the
model and its application in typical commercial, industrial and automotive
systems. One of the more significant aspects of ultracapacitor use is that
customers understand the bounds of continuous operation and when they enter into
abuse tolerance conditions. A proposed safe operating area (SOA) based on the
Ragone energy and power relationship shows how an energy slide down and time
constraint bound the continuous SOA, when operation is considered to be in
intermittent SOA and when the transition to rapid discharge occurs. These
concepts are then applied to the exciting new area of ultracapacitor plus
lithium-ion combination, in particular the power electronic converter enabled
active parallel combination. This combination of ultracapacitor with advanced
battery results in a hybrid electrical energy storage system that spans energy
optimized to power optimized and is capable of operation to -40oC
without power derating, is tolerant of high rate charging, and has improved
thermal performance. In addition, the combination supports fixed bus operation
leading to more reliable and durable traction drive control, a requirement in
automotive electric, hybrid and plug-in hybrid vehicles.
Outline:
- Brief Review of Electrochemical
Capacitors and Attributes
- Electronic Simulation Model
Development
- A Proposal for Ultracapacitor Safe
Operating Area (SOA)
- Ultracapacitor + Lithium-ion
Simulation Example
- Power Electronics Interface to
Ultracapacitor Tank for Plug-in HEV
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Wrap-up and Q&A
About the Instructor
 John
M. Miller joined Maxwell in December 2005. His
initial focus was on development and promotion of
ultracapacitor-based solutions for the automotive and heavy
vehicle industries, and in 2007 he assumed additional
responsibility for worldwide applications engineering, including
development of “Maxwell University” curriculum for field
application engineers. Previously, he spent 18 years in a
series of engineering and research and development positions
with the Ford Motor Company, where he led several Ford
automotive electronics and electric and hybrid drive train
development programs before taking early retirement in 2002.
Immediately prior to joining Maxwell, he spent three years as an
industry consultant, author and guest lecturer. He holds 52
patents and has written more than 140 scientific and technical
papers and three books, including Hybrid Vehicle Propulsion
Systems, which was published in 2003. He holds a BS degree from
the University of Arkansas, an MS degree from Southern Methodist
University and a doctorate from Michigan State University, all
in electrical engineering.
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Engineering, LLC
