Further study of the intrinsic safety of internally shorted lithium and lithium-ion cells within methane-air
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Further study of the intrinsic safety of internally shorted lithium and lithium-ion cells within methane-air

Filetype[PDF-1.66 MB]

  • English

  • Details:

    • Alternative Title:
      J Loss Prev Process Ind
    • Description:
      National Institute for Occupational Safety and Health (NIOSH) researchers continue to study the potential for lithium and lithium-ion battery thermal runaway from an internal short circuit in equipment for use in underground coal mines. Researchers conducted cell crush tests using a plastic wedge within a 20-L explosion-containment chamber filled with 6.5% CH|-air to simulate the mining hazard. The present work extends earlier findings to include a study of LiFePO| cells crushed while under charge, prismatic form factor LiCoO| cells, primary spiral-wound constructed LiMnO| cells, and crush speed influence on thermal runaway susceptibility. The plastic wedge crush was a more severe test than the flat plate crush with a prismatic format cell. Test results indicate that prismatic Saft MP 174565 LiCoO| and primary spiral-wound Saft FRIWO M52EX LiMnO| cells pose a CH|-air ignition hazard from internal short circuit. Under specified test conditions, A123 systems ANR26650M1A LiFePO| cylindrical cells produced no chamber ignitions while under a charge of up to 5 A. Common spiral-wound cell separators are too thin to meet intrinsic safety standards provisions for distance through solid insulation, suggesting that a hard internal short circuit within these cells should be considered for intrinsic safety evaluation purposes, even as a non-countable fault. Observed flames from a LiMnO| spiral-wound cell after a chamber ignition within an inert atmosphere indicate a sustained exothermic reaction within the cell. The influence of crush speed on ignitions under specified test conditions was not statistically significant.
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