Patent ID: 9577266
Date: 2017-02-21
CPC Classifications: H01M,Y02E,Y10T

Claim:
1. A method for producing a negative grid for a battery comprising: providing a strip of battery grid material; performing a punching operation on the battery grid material to remove material and form the negative battery grid; whereby the negative battery grid has a plurality of grid wires joined at a plurality of nodes and formed by the punching operation into a uniform pattern of grid wires bounded by a frame comprising: wherein each of the grid wires coupled to the top frame member is joined to the top frame member at an intersection point having a conductivity enhancing feature configured to aid conductivity between the plurality of grid wires and the frame; wherein the conductivity enhancing feature of each grid wire is formed by a gradual widening of grid wire beginning from a node immediately adjacent to the top frame member toward the intersection point wherein the remainder of the grid wire not having a conductivity enhancing feature has a substantially constant thickness; and wherein the negative grid is free of exposed wire ends for preventing puncturing of a polymeric separator when the negative grid is provided within the separator.