Are lithium ion cells intrinsically safe?
Dubaniewicz TH Jr.; DuCarme JP
IEEE Trans Ind Appl 2013 Nov-Dec; 49(6):2451-2460
National Institute for Occupational Safety and Health researchers are studying the potential for Li-ion-battery thermal runaway from an internal short circuit in equipment approved as permissible for use in underground coal mines. Researchers used a plastic wedge to induce internal short circuits for thermal runaway susceptibility evaluation purposes, which proved to be a more severe test than the flat plate method for selected Li-ion cells. Researchers conducted cell crush tests within a 20-L chamber filled with 6.5 % CH4-air to simulate the mining hazard. Results indicate that LG Chem ICR18650S2 LiCoO2 cells pose a CH4 explosion hazard from a cell internal short circuit. Under specified test conditions, A123 Systems 26650 LiFePO4 cells were safer than the LG Chem ICR18650S2 LiCoO2 cells at a conservative statistical significance level.
Mining-industry; Underground-mining; Coal-mining; Explosion-protection; Explosion-prevention; Explosive-atmospheres; Explosive-gases; Explosive-hazards; Electrical-hazards;
Author Keywords: Batteries; Electrical accidents; Explosion protection; Fires; Hazardous areas; Ignition; Mining industry; Occupational safety; Standardization
Thomas H. Dubaniewicz, Jr., Lead Research Electrical Engineer, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research, 626 Cochrans Mill Rd., Pittsburgh, PA 15236, USA
IEEE Transactions on Industry Applications