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Johnson – NETL, Sriramulu, Stringfellow – TIAX III.D.3 Internal Short Circuits in Lithium-Ion Cells for PHEVs 200 150 100 50 0 Conclusions and Future Directions Collection and analysis of thermal runaway data under controlled conditions on custom-built 18650 cells have allowed us to validate an FEA model. Using the validated model, we are simulating thermal runaway in a large PHEV Li-ion cell following an internal short. Sensitivity analyses will help further elucidate the conditions that influence thermal runaway following an internal short circuit. We will derive some general guidelines for safe cells and packs from these simulations. FY 2013 Publications/Presentations Portions of this work were presented at: 0 200 400 Time (s) 800 1000 h = 12 W/m2-K Thermal runaway occurred at this point h increased from 12 to 50 W/m2-K 600 Figure III - 111: Experimental data demonstrating the benefit of increased heat transfer coefficient (h) in suppressing thermal runaway. When h was maintained at ~12 W/m2-K, thermal runaway occurred at ~700 s (cell surface temperature ~150oC). Temperatures higher than 150oC are not reported because the thermocouple was dislodged when the cell experienced thermal runaway, but we visually observed flames and a red-hot cell surface. In a subsequent experiment, h was increased from ~12 W/m2-K to ~50 W/m2-K when the surface temperature exceeded 130°C, resulting in cell cool down and suppression of thermal runaway. Identical cells were used in the two experiments 1. 2. 30th International Battery Seminar and Exhibit, Ft. Lauderdale, FL, March 2013. 224th Electrochemical Society Meeting, San Francisco, CA, October 2013 FY 2013 Annual Progress Report 113 Energy Storage R&D Temperature (deg-C)PDF Image | Advanced Battery Development
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