NICKEL-CADMIUM AIRCRAFT BATTERIES: MANAGEMENT FOR ENGINE CRANKING

Authors
  1. Feldman, K.
  2. Verville, G.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
Nickel/cadmium aircraft batteries with Celgard barrier materials may be freely used for cranking turbine engines. However, frequent use for this purpose with insufficient intervening cooling still results in successive increases in battery temperature. The experiments were terminated when "hot spot" temperatures between the cells reached 100C. Short term experiments indicated no apparent problems. In long term use for cranking, performance was found to deteriorate as water depletion, due to overcharge, became severe. Replacement of water and deep cycling restored the original condition. Improved cranking performance was found with initial electrolyte concentrations below the customary 30% potassium hydroxide. It is emphasized that the above comments do not apply to batteries with cellophane barriers.
Report Number
816 —
Date of publication
15 Oct 1979
Number of Pages
36
DSTKIM No
80-00204
CANDIS No
124912
Format(s):
Hardcopy

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