Development of an on-Demand Internal Short Circuit (NREL/NASA)
NREL uses the internal short circuit device to better understand the failure modes of Li-ion cells and to validate NREL’s abuse models. The internal short produced by NREL’s device is consistent and is being developed as an analysis tool for battery manufacturers and other national laboratories as well as OEMs. This has broad-reaching applications as automakers bring electrified vehicles to market in larger
Over the past three years, NREL has implanted their ISC into cylindrical 18650 LiCoO2 cells to determine the effectiveness of a shutdown separator with regards to ISC type – in particular, we compared a collector to collector ISC versus a collector to aluminum ISC. NREL has also been using the ISC to determine the effectiveness of a non-flammable electrolyte in LiMnO4 pouch cells. During our presentation, we will update the battery community on the effectiveness of the ISC in understanding the behavior of these safety devices incorporated into these two cell types and chemistries. We will also show how the ISC can be used for propogation testing in modules and packs.