Patent ID: 7094495
Filing Date: 2006-08-22
Classification: H01M

Abstract:
1. A primary alkaline cell comprising a negative and a positive terminal, and an outer housing of cuboid shape, said housing having a closed end and opposing open end, said cell further comprising an anode comprising zinc and a cathode comprising MnO 2 within said housing, a separator between said anode and cathode, and an end cap assembly sealing the open end of said housing; wherein the cathode comprises a plurality of rectangular shaped cathode slabs; wherein each of said slabs has a central opening devoid of cathode material; wherein said cathode slabs are stacked within the housing along the cell's central longitudinal axis so that said openings devoid of cathode material are in alignment forming a central core along said longitudinal axis, with the outer surface of said cathode contacting the inside surface of said housing; wherein said cell comprises a vent mechanism which activates to release gas pressure from within the cell as said gas pressure rises, said vent mechanism comprising a plug seatable in a cavity within said end cap assembly; wherein said plug becomes unseated when gas pressure within the cell interior rises, thereby opening said cavity to the cell interior and releasing gas pressure therethrough; wherein said plug has solid cylindrical base and an integral solid cylindrical body extending from said base, wherein said cylindrical body is of diameter less than the diameter of said base.