Nickel/Cadmium Aircraft Batteries: Float Charge Test,
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
Pagination or Media Count:
Manufacturers have been unable to supply nickelcadmium aircraft batteries which could pass the float charge test specified in the Canadian Forces Specification CF-B-70. Battery behavior under the conditions of the test has therefore been investigated. The batteries tested started into thermal runaway because oxygen generated at the nickel plate reached the cadmium plate and reacted exothermally with it. Recommendations are made for battery improvement, with respect to type of separator material and how it should be wrapped around the plates. Suggestions for modification of the float charge test are also made, so that it can be more useful in identifying those batteries which are best able to withstand floating at high temperatures. Suggestions for improved screening of defective cells and for limiting the overcharge on board the aircraft are made.
- Electrochemical Energy Storage