State-of-Safety algorithm for Li-ion Batteries based on internal novel sensing technologies

The broader adoption of Li-ion Batteries (LiB) in a wide range of applications (including stationary and mobility ones) is a necessary step ahead to comply with the objectives of the green transition. However, simultaneously, the spread of these systems is increasing the safety requirements, as avoiding devastating events such as thermal runaway becomes essential. In this regard, this research work proposes a novel State of Safety (SoS) algorihtm, which is claimed to be a modular concept that represents the actual safety state of LiBs. The proposed state algorithm is defined between 0 and 1, being 0 a critically LiB unsafe state and 1 a state guaranteeing LiB safety. In order to quantify the safety state, the SoS is divided into several subfunctions, which include among others the temperature, charging current, discharging current, over voltage or under voltage. Additionally, the SoS function can be enhanced with the readings of novel sensing technologies, which allow the readings of the the anode potential, cathode potential or pressure. The poster presents a parametrization of the SoS algorithm and a practical implementation with the data of a LiB overdischarge test and a LiB short circuit test. This implementation demonstrates the benefits of the proposed SoS algorithm