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OVEN TESTS

OVEN TESTS. Determine risk of battery ignition due to smoldering suppressed fire in cargo compartment Smoldering fire can have temperatures in the 1000 Deg F range Auto-ignition temperature for pure lithium is 355 Deg F. OVEN TEST FACILITY. Insulated steel box, one cubic foot Propane burner

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OVEN TESTS

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  1. OVEN TESTS • Determine risk of battery ignition due to smoldering suppressed fire in cargo compartment • Smoldering fire can have temperatures in the 1000 Deg F range • Auto-ignition temperature for pure lithium is 355 Deg F

  2. OVEN TEST FACILITY • Insulated steel box, one cubic foot • Propane burner • Thermocouple instrumentation • Batteries suspended in center on wire mesh • Loose lid in case of explosion

  3. CR2 OVEN TESTS • Five tests were conducted with 4 CR2 batteries wired together • Average ignition temperature: 487 Deg F • Average temperature rise in oven due to battery ignition: 524 Deg F

  4. PANASONIC PL123A OVEN TESTS • Five tests conducted with 4 Panasonic PL123A batteries. • Average ignition temperature: 466 Deg F • Average temperature rise in oven due to battery ignition: 514 DegF

  5. EXPLOSION TESTS • Purpose: Measure magnitude of pressure rise in an enclosed space due to battery ignition • Cargo compartment integrity can be breached at about 1 psi

  6. EXPLOSION TEST FACILITY • FAA Pressure Modeling Facility • Steel tank rated for 1000 psi • Volume: 10 cubic meters (353 Cu. Ft.) • Small pan fire, 50 ml alcohol, remote ignition • Pressure transducer • Video

  7. EXPLOSION TESTS • Four CR2 Batteries • Eight CR2 Batteries • Sixteen CR2 Batteries • Four Duracell PL123A • Three Panasonic CR123A

  8. CONCLUSIONSOven / Explosion Tests • The temperatures found in a suppressed smoldering cargo fire are sufficient to ignite a primary lithium battery • The pressure rise due to battery ignition is sufficient to compromise the integrity of a cargo compartment

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