Li-ion battery resistance study due to an external short circuit using a zero bouncing circuit and its comparison to cyclic ageing

External short circuit (ESC) testing is one of the many steps towards making lithium-ion batteries safe for different applications. The nature of testing is sensitive due to the concern of safety and data integrity. Great care and planning must be done before conducting these tests. Bouncing in recorded data is observed in literatures with high sampling rates due to switching and moving mechanical parts. This impacts the estimation accuracy of battery internal parameter values especially the effective ohmic resistance (Ro). This paper proposes a zero bouncing circuit design to eliminate this problem. Multi-rate Pulse Discharge Testing (MPDT) is conducted at safe current levels up to 7C at 25°C. To extract the values of internal battery parameters, Python is used, and the values are compared with those from an ESC test conducted using the same setup. In a bid to prevent more batteries from entering the waste stream, internal resistance of a post ESC battery (PESCB) is measured and compared to the internal resistance change during cyclic ageing of a healthy battery (HB).