Cambridge EnerTech’s
Optimizing Battery Management Systems & Charging Strategies
Lithium-Ion Battery Engineering Leading to Safer Batteries and Faster Charging
October 24, 2019
Optimizing battery management systems and charging are vital to successful battery integration. Creating versatile and well-designed battery management systems in a fast charge battery is one of the top hurdles battery engineers face. Hear from expert
scientists as they provide insight on how to extend the life of their battery packs and decrease charging time.
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THURSDAY, OCTOBER 24
7:00 am Registration
7:30 Continental Breakfast Breakout Discussion Groups*
8:30 Chairperson’s Remarks
Rengaswamy (Srini) Srinivasan, PhD, MD, Applied Physics Laboratory, The John Hopkins University
8:35 Validation of BMS Functional Safety by Means of Virtual Failure Injection and Hardware-in-the-Loop
Stefan Butzmann, PhD, Associate Professor, Faculty of Engineering, University of Wuppertal
With increasing share of electromobility and renewable energies, Functional Safety of BMS will become even more important than it is already today. Due to the rising complexity of battery systems, the design and validation of BMS regarding Functional
Safety will also require higher effort. The presented tool helps to minimize these efforts without losing validity.
9:05 Impedance-Based Battery Management System for Safety Monitoring of Lithium-Ion Batteries
Rengaswamy (Srini) Srinivasan, PhD, MD, Applied Physics Laboratory, The John Hopkins University
This BMS ensures battery safety and efficiency by tracking and acting on emerging mismatches and electrical and thermal abnormalities in each individual cell without adding cost, volume, weight or power, compared to conventional BMS. Predicting a mismatch
is essential for a battery’s safety and efficiency. Data for batteries with intentionally calendar-aged and over-discharged cells convincingly demonstrate that such BMS cannot identify cell mismatches and emerging failures. In contrast, the
multifrequency impedance-based BMS tracks identify and act on changes in the internal state of each cell continuously in real time, including battery charging, discharging, and at rest.
9:35 Safety Behaviors of Lithium-Ion Battery Upon Mechanical Abusive Loading
Jun Xu, PhD, Professor, Mechanical Engineering and Engineering Science, University of North Carolina Charlotte
This talk presents an overview of a series of our recent work on safety behaviors of lithium-ion battery upon mechanical abusive loading from experiment, multiphysics modeling, and simulation. The proposed multiphysics model, as well as development methodology,
lay a solid foundation towards design, evaluation, monitoring, and protection of lithium-ion batteries.
10:05 Coffee Break in the Exhibit Hall with Poster Viewing
10:35 Predicting Transition in Capacity Fade Trend Using Physics-Based Prognostics
Chao Hu, PhD, Assistant Professor, Department of Mechanical Engineering Department of Electrical and Computer Engineering, Iowa State University
Cell capacity fade at an elevated temperature is found to be exponential with a decreasing rate of fade in the early stage of cycling, but linear with a high rate of fade in the late stage. The traditional and commonly used capacity-based prognostics
approach lacks the ability to predict this transition in the capacity fade trend. This talk will introduce a physics-based prognostics approach that enables an early prediction of the onset and progression of the late-stage fade trend by tracing the
evolution of three degradation parameters. The effectiveness of physics-based prognostics will be demonstrated using high-precision cycling data collected from implantable-grade lithium-ion cells over a 1.5-year test duration.
11:05 Chemical and Mechanical Degradation and Mitigation Strategies for Si Anodes
Partha Mukerjee, PhD, Associate Professor, Mechanical Engineering, Purdue University
Atomistic and mesoscopic models are used to analyze cracking and stresses produced during charge of Si nanoparticles covered by a thin SEI film. Mechanical stresses coupled to chemical effects are investigated with classical molecular dynamics simulations
and with a mesoscopic model. Rupture of the surface film is the main cause of capacity fade and damage evolution is strongly influenced by the structure of the solid film.
11:35 Battery Management Systems Toward Safer Batteries
Thomas Hoeger, Naval Surface Warfare Center
12:05 pm Enjoy Lunch on Your Own
2:00 Chairperson’s Remarks
2:05 Layering of Sensor Technologies for Robust Early Detection of Thermal Runaway
Brian Engle, Specialist, Amphenol Advanced Sensors
This presentation will explore the nature of the venting process that precedes the runaway event and describe the strengths and weaknesses discrete sensor based detection technologies as well as strategies to utilize multiple sensors in combination to cost effectively reduce risk while providing the earliest possible robust detection of an event. Presentation will include exemplary data of typical sensor response characteristics to thermal event.
2:35 Power Electronic-Based Active Battery Energy Management Solutions for E-Transportation and Autonomous E-Mobility
Sheldon Williamson, PhD, Professor and NSERC Canada Research Chair in Electric Energy Storage Systems for Transportation Electrification, Department of Electrical, Computer and Software Engineering, University of Ontario
Fundamental topologies of power electronic converters, specifically utilized for bidirectional current flow in cell balancing applications, will be discussed. The design, implementation, and testing/validation of an active cell equalization circuit for
a traction Li-ion battery pack will also be presented.
3:05 Prediction of Two-Stage Degradation Behavior Using Accelerated Cycle Life Testing and Identification of Knee Point
Weiping Diao, Research Assistant, Center for Advanced Life Cycle Engineering (CALCE), University of Maryland
IOT devices expect Li-ion batteries to have a long cycle life because they may be used in areas where battery replacement is not easy. This session talks about a method to extend battery cycle life through a battery charging algorithm. This is expected
to reduce the cost of ownership as it enables less battery replacement.
3:35 Refreshment Break in the Exhibit Hall. Last Chance for Poster Viewing.
4:15 Fast Charging of Lithium-Ion Batteries at All Temperatures
NEW: Xiao-Guang Yang, PhD, Assistant Research Professor, Mechanical Engineering, The Pennsylvania State University
Range anxiety is a key reason that consumers are reluctant to embrace electric vehicles (EVs). To be truly competitive with gasoline vehicles, EVs should allow drivers to recharge quickly anywhere in any weather, like refueling gasoline cars. However,
none of today’s EVs allow fast charging in cold or even cool temperatures due to the risk of lithium plating, the formation of metallic lithium that drastically reduces battery life and even results in safety hazards. Here, we present an approach
that enables 15-minute fast charging of Li-ion batteries in any temperatures (even at −50 °C) while still preserving remarkable cycle life (4,500 cycles, equivalent to >12 y and >280,000 miles of EV lifetime), thus making EVs truly
weather-independent.
4:45 How a Sustainable Charging Infrastructure Can be Built
Uwe Kirchner, Senior Expert, PMM ATV Application Engineering, Infineon Technologies Austria AG
This talk will cover key aspects that must be covered to build a successful charging infrastructure.
5:15 Close of Optimizing Battery Management Systems & Charging and Dinner Workshop Registration
5:30 – 8:30 Dinner Workshop*
W3: Active Battery Energy Management Systems & Charging
Co-Instructors: Sheldon Williamson, PhD, Professor and NSERC Canada Research Chair in Electric Energy Storage Systems for Transportation Electrification, Department of Electrical, Computer and Software Engineering, University of Ontario
Vinicius Albanas Marcis, Graduate Research Teaching Assistant, University of Ontario Institute of Technology
This tutorial will give attendees an overview of battery systems design. More closely it will cover key aspects of successful battery management systems and charging.
*Separate registration required.
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