Li+ Battery ESS​ Anomaly Detection ​

Since Energy Storage Systems (ESS) store massive amount of electricity, repeated recharging on cells with vulnerability, defect, or fatigue can pump up excessive heat, which possibly leads to large-scale fire accidents. It is necessary to establish a system capable of detecting anomalies at an early stage in order to safely manage them and prevent accidents.

The characteristics of thermal runaway process are analyzed using normal ESS operation data and test data on abnormal-conditioned batteries collected from test beds by battery research centers. To predict customer-defined failure situations, we developed predictive models using quasi-supervised anomaly detection techniques.

Safety indicator provided by developed predictive model can signal occurrence of full-scale thermal runaway about 30 minutes ahead of time. It is possible to detect serious anomalies 12 hours before fire accidents and monitor abnormal conditions using the rack drop-out precursor detection model.