Nickel-cadmium battery cell with improved electrolyte reservoir

Details Nickel-cadmium battery cell with improved electrolyte reservoir Nickel-cadmium battery cell with improved electrolyte reservoir

H - Electricity

01

M

319/106, 319/33

H01M 2/14 (2006.01) H01M 10/30 (2006.01) H01M 10/34 (2006.01)

Patent

CA 1197285

ABSTRACT Nickel-cadmium battery cell 10 has a plurality of cadmium negative electrode plates 24, 26 and 28 and a plurality of alternate nickel positive electrode page 30 and 32. The separator space therebetween is occupied by separator 34, 36, 38 and 40. The enhanced thickness of the separator space, more than 200 microns, serves as a reservoir which provides an increased amount of potassium hydroxide electrolyte so that as the nickel electrode grows during cycling and withdraws electrolyte from the separator by compression or crushing of the separator and by capillary action into the nickel electrode, sufficient electrolyte remains for an enhanced battery cell life. The increased interelectrode spacing also increases lifetime limited by short circuiting due to cadmium interelectrode deposits. Another embodiment employs an electrolyte reservoir positioned laterally of the electrode stack and formed of foamed material so that upon growth of the nickel electrodes, the foam crushes to permit main- tenance of the separator space and supply electrolyte.

434175

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