Smart Battery Energy Management and Health Conscious Fast Charging for Future Transport-Slides

Abstract: It has become imperative to find a solution to manage energy production and usage accurately, especially within the context of future electric energy storage for aerial vehicles and autonomous etransportation systems. Enhancing the life of Lithium Ion (LiIon) battery packs has been the topic of much interest. In this framework, the role of on board cell voltage balancing of Li Ion batteries will be highlighted in this talk. This is a very important topic in the context of battery energy storage cost and life state of charge, SOC (state of health), SOH monitoring. Li Iion batteries, although popularly proposed for electric transport, have been highly uneconomic for energy storage, overshooting cost requirements by a large margin.

This talk will also introduce a first of its kind closed-loop cell charge (voltage) balancing and extreme fast charging technique. The technique uses instantaneous cell voltage and or temperature rise as a control parameter. Existing charging techniques for Li Ion batteries use a largely open loop approach, where the charge profile is pre decided, based on apriori knowledge of cell parameters. There is a need for closed loop charging techniques that use instantaneous cell voltage and or temperature to modulate the charging current magnitude. This seminar addresses this gap by proposing for the first time ever a constant temperature constant voltage (CT-CV) charging technique, considering cell temperature as a key degradation metric. This talk will also establish the benefits of the proposed CT-CV charging at cell level and increases the possibility of extending it to the pack level by integrating it with battery management systems.