Experimental analysis on lithium iron phosphate battery over-discharged to failure

In this paper, a series of experiments were performed to investigate the thermal and electrical characteristics of a commercial lithium ion battery (LIB) over-discharged to failure. Specific information including voltage, current, capacity and battery surface temperature were measured and analyzed. According to the results, it is demonstrated that batteries behave obvious temperature rise during the over-discharge process and the temperature rise increase with the increasing charge rate. Besides, the LFP (lithium iron phosphate) exhibits gentler temperature rise than the NMC (nickel manganese cobalt oxide) battery in the over-discharge process. And the discharge rate is found there no huge effect on the lost capacity of battery when it is over-discharged to failure.