MIT & Johnson Controls join Battery Safety and Lithium Battery Power Conferences to Present on Computational Modeling for Li-Ion Crash Safety and Battery Management for Safety, Performance & Reliability

Boston, MA (PRWEB) November 07, 2012

Leading experts from around the world will convene in Las Vegas on December 4-7, 2012 for the 8th International Lithium Battery Power & Battery Safety 2012 conferences. With over 45 presentations over 4 days these meetings will showcase the very latest scientific developments from around the world. MIT & Johnson controls are the latest organizations to join the extensive list of presenters for this key industry event. The presentation abstracts from these two organizations are featured below.

Characterizing Crash Safety of Cylindrical and Pouch Li-ion Batteries using Computational Modeling

Tomasz Wierzbicki, PhD, Department of Mechanical Engineering, Massachusetts Institute of Technology

Mechanical integrity of Lithium-ion batteries is one of the most important issues on safety of electric cars, but the least studied topic. As these batteries are not limited to stationary applications anymore, and are being used in vehicle battery packs, this aspect of their safety is more urgent to be characterized and quantified. The automotive industry has realized that no battery pack could be rigid enough to ensure zero deformation to battery pack in severe enough crash conditions. In this research, two common form factors of cylindrical and pouch batteries are characterized for several scenarios of deformation applied to these cells. A comprehensive testing program was used to characterize the material properties of the cells under combined tension and predominantly compression and shear loading. Then, computational models of the cells were developed. The models successfully predict load-deformation trajectory and kinematics of the cell under various types of tests. Additionally, the models are capable of predicting failure in the jelly-roll of the cell, indicating an internal short-circuit under mechanical deformation. To compare the pouch and cylindrical cells tested in this research, the cylindrical cell tolerated a load of 5,500N and a deformation of about 7 mm before reaching short circuit, while the pouch cell tolerated a load of 7,500N and a deformation of 3 mm before failure. Predicting onset of electric short circuit is a necessary condition for possible thermal runaway.

Battery Management at the System Level: Safety, Performance and Reliability

Larry J. Yount, LaunchPoint Energy and Power LEAP LLC &

Mark Gunderson, Johnson Controls, Inc

The advent of electronic controls in the vehicle has brought on an increasing need or relevance to safety
Drive by wire, break by wire, cruise controls have been leading functions for safety in the vehicle
Electric propulsion has exposed the automotive industry to new areas of safety hazard new large energy source, high voltage
More rigorous regulations and standards are being brought to bear into the automotive space due to the advance battery electric propulsion i.e. ISO26262
Historically, critically safety systems have implied rigorous design methods and redundant systems driving significant cost.
Automotive has be a high volume cost conscious industry
JCI is making a strong effort to provide state-of-the-art safety systems at the battery system level
JCI has addressed battery system safety through our material, cell, electronic controls, and system level components.
With varying conditions and failure modes within an electric propulsion system, there are always some hazards that can only be sufficiently mitigated through BMS intervention
JCI has developed a battery that optimizes system safety taking maximum advantage of capabilities provided through BMS electronics and software control.
Key Messages:
Developed fully ISO26262 ASIL D capable fail-safe controls system without significant electronic redundancy
System level top-down safety concept development approach optimizes battery system cost while meeting safety regulations
Adopted best in class safety analysis approaches in safety development
JCI has focused to develop system safety with cell safety as an integral element of the total solution

Distinguished Faculty:

-Brian Barnett, PhD, TIAX LLC

-Andrew F. Burke, PhD, Institute of Transportation Studies, University of California-Davis

-Steve Carkner, Panacis, Inc

-Zonghai Chen, PhD, Argonne National Laboratory

-Hua Cheng, PhD, Newcastle University, United Kingdom

-Michael D. Eskra, Eskra Technical Products, Inc.

-Alejandro A. Franco, Prof Dr, Atomic and Alternative Energy Commission of France

-Mark Gunderson, Johnson Controls, Inc.

-Wei He, University of Maryland

-Judith Jeevarajan, PhD, NASA Johnson Space Center

-Steven Kaye, PhD, Wildcat Discovery Technology

-Brian J. Landi, PhD, Rochester Institute of Technology

-David S. Lashmore, PhD, Nanocomp Technologies Inc.

-Andrew J. Manning, Lithium Battery Engineering, LLC

-Shreefal Mehta, PhD, Paper Battery Company

-Kai-Christian M

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