Pre-Recorded Webinars

Showing 117–120 of 143 results

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  Battery EIS Tutorial Course 4/4: Factors Affecting EIS Measurements – How to Check and Correct

  When performing an impedance measurement, it is necessary to ensure that the modulation is low enough such that the behavior of the system is linear. It should also be confirmed that the system does not vary in time, and that its stationary state is reached. Several strategies are given to check and correct these phenomena.

  This webinar will focus on the following key topics:

  • For reliable EIS measurements, it should be checked that the response of the system is linear, time-invariant and stationary
  • Several strategies are presented to perform reliable impedance measurements

  Presenter
  Dr. Nicolas Murer – Product Manager and Applications Engineer at Bio-Logic SAS, France

  Dr. Nicolas Murer is a Product Manager and Applications Engineer at Bio-Logic SAS, France, which designs and manufactures high performance research grade instrumentation and software : potentiostats/galvanostats with built-in Electrochemical Impedance Spectroscopy (EIS), Battery Cyclers, Frequency Response Analyzers for materials analysis, and scanning probe electrochemical workstations. Nicolas received his engineering diploma from Polytechnic Institute of Grenoble in electrochemistry and materials in 2003. He then received his Ph.D. at Université de Bourgogne in 2008. Prior to joining Bio-Logic, he was a post-doctorate at the Ohio State University, Columbus, Ohio (USA).

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  Electrochemical Impedance Spectroscopy (EIS) Quality Indicators

  The response of a linear and time invariant system to a sinusoidal stimulus of a given frequency is a sinus wave of the same frequency. The amplitude spectra obtained by the Fourier transform will reveal only one spectral line. In the case of a nonlinear system the amplitude spectra will contain several spectral lines called harmonics. The total harmonic distortion (THD) coefficient for N chosen harmonics can be used as an indicator of the system nonlinearity. In the case of a non-stationary system spectral lines appears in the vicinity of the main harmonic. The non-stationary distortion (NSD) coefficient calculated as the RMS ratio of amplitudes of the near-side frequencies to the amplitude of the fundamental can be used as an indicator for non-stationarity.

  Examples of THD and NSD calculations are given highlighting the quality of low frequency impedance measurements on batteries.

  This webinar will focus on the following key topics:

  • General requirements for good impedance measurements
  • Effects of non-linear systems on EIS measurements
  • Effects of non-stationary systems on EIS measurements
  • THD as an indicator of system non-linearity
  • NSD as an indicator of system non-stationarity

  Presenter
  Dr. Bogdan Petrescu – Senior Scientist at Bio-Logic SAS, France

  Bogdan Petrescu is a senior scientist at Bio-Logic Science Instruments. He received his Ph.D in both fields of electrochemistry and electronics in 2002 from the Polytechnic Institute of Grenoble and the Polytechnic University of Bucharest respectively. He was involved for many years in the development of the Bio-Logic potentiostats and battery cyclers. He has a strong expertise in the field of instrumentation for electrochemistry research and more particularly in the research and development of energy storage devices such as batteries and supercapacitors.

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  Preventing Li Ion Battery Failures From a Manufacturing and Design Perspective

  How can you be proactive and make sure your cell supplier is the right one and you don’t end up with thermal events and field failures? Is it enough to qualify a cell manufacturer according to industry standards? The answer is that the majority of compliance based testing is related to abuse tolerance. However, the vast majority of field failures do not occur under abuse scenarios, but happen under normal operating conditions due to manufacturing flaws or design and system tolerance issues that cause internal shorts. In this webinar, you will learn about common lithium ion battery failure modes and how to be proactive in preventing these.

  This webinar will focus on the following key topics:

  • Gain an understanding of lithium ion battery failure mechanisms and the pathway to thermal events
  • Learn how cell design impacts battery safety and reliability
  • Learn the basic steps in a lithium ion cell manufacturing process, and how the process controls affect safety and reliability
  • Come away with a checklist to qualify your cell manufacturer

  Presenter
  Vidyu Challa – Technical Director at DfR Solutions

  Vidyu Challa is Technical Director at DfR Solutions where she works on battery reliability and safety issues. Dr. Challa helps customers with their battery challenges including design reviews, manufacturing audits and supplier qualification. She obtained a PhD from CALCE Electronic Products and Systems Center at the
  University of Maryland. She has broad based expertise that includes engineering technology start-up experience, product development, R&D, and business development. Dr. Challa has published her work in journals, presented at conferences and written blog articles.

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  Avoid Battery Explosions and Fires – With Right Data and Better Designs

  Modern Li Ion batteries contain hazardous chemicals and heat up during use – this combination always has the potential to cause fires and explosions. This presentation will focus on improving the understanding of how such incidents occur, what can be done to avoid them and how the risk can be minimized during early stage design.

  The solution lies in knowledge of the heat generation rate during normal use, and information about safe boundaries such as temperature, discharge rate & overcharge in realistic situations that represent actual conditions of use. Data from commercial batteries of different types, including videos of batteries undergoing thermal runaway, will be used to illustrate these points.

  A relatively new technique will also be discussed with data, which allows total heat output during discharge to be measured on-line and this can be used both for design and battery modelling. Examples of the data will be provided.

  This webinar will focus on the following key topics:

  • Why battery fires and explosions occur
  • How to design safer batteries through understanding of heat generation
  • Video evidence of batteries under explosive conditions
  • How better thermal management systems can be designed – based on heat measurement from isothermal calorimetry
  • Laboratory instruments suitable for testing and data generation

  Presenter
  Dr. Jasbir Singh – Managing Director at Hazard Evaluation Laboratory

  Jasbir is a chemical engineer specializing in thermal hazards and calorimetry, traditionally for the chemical industry but now increasingly involved in battery safety, especially Li-ion EV and related types.

  A graduate of Imperial College (London), where he undertook PhD into combustion and explosions, his experience includes many years in process design for the chemical and petrochemical industries. He is currently developing test methods and instruments for use in design of battery thermal management systems.

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