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Save the Date: November 10–12, 2020
E/HV Tech Expo Digital Days Schedule Viewer

Welcome to the The Battery Show and Electric & Hybrid Vehicle Technology Digital Days Conference Session Viewer. Browse and sort the growing list of sessions by day, time, pass type, topic, or format. All session times are shown in Eastern Time, except 3rd day (November 12th) EU Conference Pass sessions are in Central European Time. Check out the event Conference Page for more information related to the event schedule. Register for Digital Days and login to the event platform to begin bookmarking sessions, building your schedule, and accessing whitepapers.

Business Lightning Talk: Impedance-Based Battery Life Cycle Management

Steven Chung  (CEO, ReJoule)

Location: USA

Date: Wednesday, November 11

Time: 4:00pm - 4:15pm

Pass Type: Virtual Conference Pass (Paid), Virtual Conference Pass + EU (Paid)

Track: Battery Design & Manufacturing

Format: Business Lightning Talk

Vault Recording: TBD

Audience Level: Intermediate

As electric vehicles and stationary storage continue to be adopted in large numbers, OEMs, fleet operators, and energy providers must grapple with the challenges of maintaining large battery packs. All batteries degrade, but the challenge is knowing by how much and when they may fail. This session is about using ac impedance of battery cells, modules, and packs, as a measure of battery health. The AC Impedance of a battery, measured using a technique called electrochemical impedance spectroscopy (EIS), strongly correlates to the battery's electrochemical degradation and state-of-health (SOH). There is strong scientific support for using EIS as a proxy for battery health, but, before EIS can be widely deployed in field applications, more must be understood about 1) how to quantify the relationship between impedance and SOH, and 2) how to perform impedance measurement outside of the laboratory and in real-world scenarios. This session will dive into each of these aspects above and provide guidance on the test procedures and algorithms required to use AC impedance for state-of-health estimation. A case study on applying the technology to second-life battery grading applications will also be presented.


Electrochemical Impedance Spectroscopy (EIS) can be a powerful technique to understand and predict long term battery performance for field batteries. ReJoule has developed hardware and software tools to measure and model batteries using EIS.

Intended Audience

This session is intended for battery system engineers, electrochemists, battery management system engineers, and people interested in battery optimization. The contents of the session are rather technical, so it is a prerequisite that the target audience have a basic working knowledge of battery systems.