Patent ID: 7413828

Claim:
A primary wafer alkaline cell comprising a negative and a positive terminal, an outer boundary surface covering said cell, and a pair of opposing sides comprising at least the majority of said boundary surface of said cell, said opposing sides defining a short cell dimension therebetween defining the cell thickness, said cell comprising an anode assembly and a cathode assembly bonded together forming a laminate structure, said anode assembly comprising an anode comprising zinc and aqueous alkaline electrolyte and said cathode assembly comprising a cathode comprising manganese dioxide and aqueous alkaline electrolyte; wherein said anode assembly comprises a anode housing comprising an anode frame comprising plastic material, said anode frame having an inner peripheral edge defining the boundary of an anode cavity for housing said anode, an outer peripheral edge defining the outer boundary of the anode frame, wherein said anode frame has a front side and opposing back side comprising said peripheral edges and wherein said anode assembly further comprises an anode current collector sheet consisting essentially of metal bonded with bonding material directly to the back side of said anode frame so that it faces an outer surface boundary of the cell and said anode is inserted into said cavity so that it is in contact with a portion of said anode current collector sheet; wherein the anode frame width is at least as wide as the cell thickness to provide a first elongated leakage block path for said cell, said first electrolyte leakage block path defined by said bonding material between said anode frame and said anode current collector sheet to reduce the chance of electrolyte leaking from the cell interior to the external environment; wherein the cathode assembly comprises a cathode frame comprising a plastic material, said cathode frame having an inner peripheral edge defining the boundary of a cathode cavity, an outer peripheral edge defining the outer boundary of the cathode frame, said cathode frame having a first side and opposing second side comprising said peripheral edges; said cathode assembly further comprising a cathode current collector sheet consisting essentially of metal bonded directly to the opposing second side of said cathode frame so that it faces an outer surface boundary of the cell; and a cathode inserted into said cathode cavity so that it is in contact with said cathode current collector sheet.