Alkaline electrochemical cell having a non-crimped closure
View Patent ↗An adhesive closure for sealing closed the open end of an electrochemical cell container. The electrochemical cell comprises a can having an open end and a side wall, and positive and negative electrodes disposed in the can. The cell also has a cover disposed on the open end of the can and having a peripheral wall radially outside of the side wall of the can. One or more adhesives are disposed between the outer side wall of the can and the peripheral wall of the cover for adhering the cover to the can.
1. A bobbin-style electrochemical cell comprising:
a cylindrical can having an open end and a side wall;
a cover, positioned over the open end, consisting of a base and a peripheral wall extending axially away from the base wherein the peripheral wall has a terminal edge positioned radially outside of the outer the side wall;
a first adhesive disposed between at least a portion of an outer-facing length of the side wall and the peripheral wall so that the cover and the can are adhesively secured to form a non-crimped electrochemical cell container and wherein the can and the cover define an internal chamber in the non-crimped container;
a second adhesive disposed between the cover and the can wherein the first and second adhesives are located such that the first adhesive is axially closer to the open end relative to the second adhesive;
a first electrode disposed within the internal chamber of the non-crimped container;
a second electrode disposed within the internal chamber of the non-crimped container, wherein the second electrode is in contact with the side wall along substantially all of an entire inner-facing length of the side wall;
a current collector disposed within the internal chamber, said current collector in electrical contact with the cover at one end and completely surrounded by the first electrode at an opposing end; and
an alkaline electrolyte solution disposed within the internal chamber of the non-crimped container.
2. The electrochemical cell as defined in claim 1 , wherein the first adhesive comprises an epoxy having Bisphenol A.