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Breakfast with Networking – Sponsored by EXPONENT

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Dr. John Warner

Welcome Note (Chairperson: Dr. John Warner)

All Day 1 presentations will be delivered by Exponent, except where noted otherwise

About Dr. John Warner

John McGann - Exponent

Lithium Ion Cell Construction – Beyond the Standards

Several industry standards have guidance on aspects of lithium-ion cell construction. Depending on the form factor and use profile, certain aspects of cell construction not discussed in standards may take on increasing importance. This session will discuss lithium-ion cell construction basics covered by industry standards as well as other noteworthy construction aspects for improved safety, […]

About John McGann - Exponent

Joel Forman - Exponent

Cell Cycling and Stress Testing

Understanding long term cell performance and aging is critical for many applications.  Often times, judgments about long term performance have to be made in a relatively short period of time.  This session discusses a variety of tools to accelerate this testing including 24/7 cycling, elevated/sub ambient temperature testing, increased electrical load, and Arrhenius chemical modeling.

About Joel Forman - Exponent

Rachel Licht - Exponent

The Effects of Cycling Protocols on Internal Cell Structures

The natural expansion and contraction experienced by the active materials during cycling, as well as undesired side reactions, produce mechanical stresses in the cell winding that can lead to millimeter-scale mophological changes. In cylindrical cells, these stresses drive changes to the electrode layer curvature, which can ultimately result in core collapse. The layer curvature can […]

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Coffee with Networking – Sponsored by PEC

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Samuel Madden - Exponent

Service Life Prediction for Lithium Ion Batteries

In a reactive setting, one major goal of service life prediction is to identify a time- and environment-dependent degenerative mechanism governed by a statistical process (i.e. material decomposition in response to temperature and humidity cycling) to provide actionable guidance regarding usable system lifetime.  The degenerative mechanism is generally not understood during system design (or is […]

About Samuel Madden - Exponent

Johanna Goodman - Exponent

Lithium Ion Cell Response to Controlled Abuse

Cells integrated into consumer devices are subject to physical abuse. Such abuse can result in a variety of failure modes including capacity loss, swelling, or thermal runaway. This session discusses features observed as a result of controlled mechanical abuse to lithium-ion pouch cells. The subsequent electrical performance and failure modes observed will also be discussed.

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Lunch with Networking

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Jeremiah Stepan - Exponent

Basic Electronic Protection for Lithium Ion Batteries

We will discuss the basic electronic designs used to protect lithium ion batteries against overcharge, overdischarge, overcurrent, undervoltage lockout, and operation outside their acceptable temperature range.  Aspects of the physical assembly considerations including circuit board layout, wiring harness design, and prevention of coupling heat from failure to additional cells in the pack will be discussed.

About Jeremiah Stepan - Exponent

Daren Slee - Exponent

Advanced Concepts for Lithium Ion Battery Electronics

We’ll discuss additional protection and data preservation methods used to further reduce the likelihood of li ion battery failure due to electrical or thermal stress and to preserve data for failure analysis in case of such events.  These include communications with the host, charger, and/or load, transmittal of critical data to external systems, telemetry, active […]

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Coffee with Networking – Sponsored by PEC

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Michael Barry - Exponent

Hazards due to Thermal Runaway

Discussion of hazards due to thermal runaway failures in lithium-ion cells. We’ll discuss abuse testing (external heating, nail penetration, overcharge, etc) and the quantification of gas species evolved as a result, including the attendant hazards (heat, explosions, toxic gases).

About Michael Barry - Exponent

Jonathon Harding - Exponent

Thermal Runaway Onset

This talk will discuss the conditions in which lithium-ion batteries do or don’t enter thermal runaway when they experience a catastrophic failure. This depends on many factors, including cell chemistry, state-of-charge, ambient temperature, and the nature of the failure. We’ll explore how these factors interact to determine conditions where the onset of thermal runaway is […]

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Dr. John Warner

Wrap-up (Summary & Conclusions)

Summary, conclusions and closing comments for Day 1  

About Dr. John Warner