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US 5,512,160 AGranted
Nickel-cadmium battery activation process
AssigneeHughes Aircraft Company
InventorHong S. Lim
Life of this patent
Estimating the term…
Abstract
A nickel-cadmium cell is activated by means of a formation cycling process in which electrolyte is partially removed and replenished between cycles and the ultimate electrolyte level is controlled by centrifugation following cycling.
Claims18
A process for activating a nickel-cadmium cell comprising:
- cycling the cell a multiplicity of times in an electrolyte flooded condition;
- partially replenishing the cell with fresh electrolyte during each cycle except the last cycle;
- and
- removing excess electrolyte to a predetermined volume of electrolyte during the last cycle.
1 more element
A process for activating a nickel-cadmium cell comprising:
- (a) providing a nickel-cadmium cell with an excess of electrolyte;
- (b) cycling a multiplicity of times by alternately charging and discharging said cell;
- (c) partially removing excess electrolyte and introducing a fresh batch of electrolyte periodically at an interval of predetermined number of cycles except the last cycle;
- (d) following the last cycle, removing excess electrolyte to a predetermined electrolyte level;
- and
- (e) setting overcharge protection by overdischarging the cell at a cell voltage below 0.0 V.
3 more elements
A process for activating a nickel-cadmium cell comprising the steps of:
- (a) providing a nickel-cadmium cell with an excess of electrolyte;
- (b) cycling said cell for a predetermined number of cycles at a rate between about 1/10 C and C, the rate C being defined as the rate of charge at which the cell is fully charged from a fully discharged state in one hour;
- (c) discharging said cell at the same rate to about 0.5 V;
- (d) partially removing excess electrolyte;
- (e) introducing fresh electrolyte;
- (f) repeating steps (b) to (e) a multiplicity of times;
- (g) following step (f), repeating steps (b) and (c) and then adjusting the electrolyte level to a predetermined electrolyte level;
- and
- (h) setting a predetermined level of overcharge protection by overdischarging said cell at a rate between about 1/30 C and 1/2 C at a cell voltage below 0.0 V.
6 more elements
Dependencies are inferred from the claim text.