Fault Detection on the Battery SOC-OCV by Using Observer

A Battery is utilized as an energy supply in many applications including electric vehicle. It is used for process such as charge and discharge. Utilization of batteries needs effective processing called Battery Management Systems (BMS). It provides an optimal operation such that battery has a longer lifetime. If the battery operation is not optimal it will result in error which may lead to a serious damage or failure. This failure can be anticipated by performing a fault detection on the battery. The purpose of this paper is to detect a fault on the battery SOC-OCV characteristics, i.e., a change of SOC-OCV curve by using an observer designed for simple battery model. A simulation is performed to demonstrate the observer to detect SOC-OCV fault occuring when the battery is discharged with a constant current. The results show that the observer can be utilized to detect the battery SOC-OCV fault.