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Intermixing of Cells in Nickel-Cadmium Batteries for Aircraft Usage

Federal Aviation Administration. Intermixing of Cells in Nickel-Cadmium Batteries for Aircraft Usage. International Aircraft Systems Fire Protection Working Group Atlantic City, NJ November 17-18, 2009. Steve Summer

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Intermixing of Cells in Nickel-Cadmium Batteries for Aircraft Usage

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  1. Federal Aviation Administration Intermixing of Cells in Nickel-Cadmium Batteries for Aircraft Usage International Aircraft Systems Fire Protection Working GroupAtlantic City, NJ November 17-18, 2009 Steve Summer Federal Aviation AdministrationFire Safety Branch http://www.fire.tc.faa.gov

  2. Background • RTCA SC-211 committee addresses the design, performance, operational and testing issues for Ni-Cd, Lead Acid and rechargeable Lithium batteries • Issues have been raised at RTCA SC-211 meetings regarding the intermixing of cells within Ni-Cd batteries used in aircraft • It is typical practice to replace individual cells within the battery as they reach their end of life, and there are aftermarket PMA cells approved for direct replacement • Manufacturers claim that this intermixing of cells from different producers results in a safety of flight issue in the form of reduced battery performance, increased maintenance, and an increase in thermal runaway potential

  3. Planned Work • FAA has purchased two battery testing systems from Arbin Instruments for use in this and other battery related projects • 100 V, 400 A battery analyzer for full battery system tests • 10 V, 50 A battery analyzer for cell-level tests • Equipment is expected to be delivered December 2009. • Planned tests include: • Capacity tests under various conditions • Discharge tests under various conditions • Duty cycle performance tests • Cyclic endurance tests • Induced destructive overcharge tests

  4. Planned Work (cont.) • Tests will be carried out following the specifications set forth in RTCA document DO-293 • Tests will be conducted using three Saft 4078-7 batteries configured • Fully with OEM cells • ½ OEM cells, ½ PMA cells, and • Fully with PMA cells

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