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 Method for sealing an electrochemical cell employing an improved reinforced cover assembly

Details
Inventors: Wolff, Merle;
Assignee: Energy Conversion Devices, Inc. (Troy, MI)
Primary Examiner: Skapars; Anthony
Assistant Examiner:
Attorney, Agent or Firm: Massaroni; Kenneth M., Goldman; Richard M., Siskind; Marvin S.

Disclosed is a resealable vent, reinforced cover assembly for sealing a rechargeable electrochemical cell. Also disclosed herein, is a method of fabricating a reinforced cover assembly for a rechargeable electrochemical cell, a method of employing said cover assembly to seal a rechargeable electrochemical cell, and a vent, rechargeable electrochemical having a hydrogen storage alloy electrode and a resealably vented, reinforced cover assembly.

DETAILED DESCRIPTION There is disclosed herein a sealed cylindrical, resealably vented electrochemical cell for storage of electrochemical energy.
The electrochemical cell comprises: a positive electrode having a nickel hydroxide electrode plate, e.
g.
, of sintered nickel material, which is subsequently impregnated withnickel hydroxide material; a negative electrode including a plate of a hydrogen storage alloy material; a separator means operatively disposed between said positive and negative electrodes and adapted to electrically insulate them from one another; an electrolyte material in contact with said positive and negative electrodes and said separator means; a cylindrical cell can into which the electrodes, the separator and the electrolyte are disposed in operative relationship; top and bottom insulator pads for electrically isolating the electrodes and a reinforced resealable vented cover assembly, electrically insulated from said cell can, and adapted for sealing said electrodes, separator and electrolyte in the cell can.
The cover assembly may further include a reinforced cover plate, as described hereinabove, having a vent perforation formed therethrough and having a vent plug means disposed over said perforation and held in place by means of a vent plug cap attached to said cover plate.
The positive electrode is a sintered nickel material which is subsequently impregnated with nickel-hydroxide and formed in elongated electrode form.
The negative electrode is also an elongated plate of hydrogen storage material comprising a multiphase, multicomponent, reversible electrochemical hydrogen storage alloy including titanium, vanadium, zirconium, nickel and chromium.
The hydrogen storage alloy is adapted to electrochemically charge and discharge hydrogen in an aqueous alkaline media.
The separator means disposed between said positive and negative electrodes is preferably a non-woven fabric such as nylon having a thickness of between 0.
005 and 0.
020 inches.
The thickness of the separator material must be thick enough to avoid shorting out between said electrodes, and thin enough to avoid high resistance



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