Abstract
The essential characteristics of a battery grid and the methods for its production are described. Design parameters are set out for automative and traction grids, and include the grids used in tubular positive plates. Worked examples are included. A comparison is made between surface cut and interlock grid moulds for grid casting. The relative merits of large-pellet solid-rid traction grids, lattice-type grids and composite solid-rid/lattice grids are reviewed. Common casting defects are discussed together with the probable causes for their occurrence and what remedial action is required. The formation of dross with lead-antimony alloys is examined, as well as the subsequent financial losses that can occur and the care that is needed in safe handling. The process of mould coating to allow trapped air to escape from the cavity of the mould and to delay freezing until the mould is fully filled is described, together with information on the preparation of the mould-coating slurry.
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